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Tetsu-to-Hagané Vol. 101 (2015), No. 11

ISIJ International
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Grid List Abstracts
ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575
Publisher: The Iron and Steel Institute of Japan

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  1. Vol. 110 (2024)

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  2. Vol. 109 (2023)

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  3. Vol. 108 (2022)

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  4. Vol. 107 (2021)

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  5. Vol. 106 (2020)

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  6. Vol. 105 (2019)

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  7. Vol. 104 (2018)

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  8. Vol. 103 (2017)

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  9. Vol. 102 (2016)

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  10. Vol. 101 (2015)

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  11. Vol. 100 (2014)

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  12. Vol. 99 (2013)

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  13. Vol. 98 (2012)

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  14. Vol. 97 (2011)

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  15. Vol. 96 (2010)

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  16. Vol. 95 (2009)

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  17. Vol. 94 (2008)

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  18. Vol. 93 (2007)

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  19. Vol. 92 (2006)

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  20. Vol. 91 (2005)

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  21. Vol. 90 (2004)

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  22. Vol. 89 (2003)

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  23. Vol. 88 (2002)

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  24. Vol. 87 (2001)

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  25. Vol. 86 (2000)

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  26. Vol. 85 (1999)

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  27. Vol. 84 (1998)

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  28. Vol. 83 (1997)

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  29. Vol. 82 (1996)

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  30. Vol. 81 (1995)

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  31. Vol. 80 (1994)

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  32. Vol. 79 (1993)

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  33. Vol. 78 (1992)

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  34. Vol. 77 (1991)

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    5. No.8
    6. No.7
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  35. Vol. 76 (1990)

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    5. No.8
    6. No.7
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  36. Vol. 75 (1989)

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    3. No.10
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    5. No.8
    6. No.7
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  37. Vol. 74 (1988)

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  38. Vol. 73 (1987)

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  39. Vol. 72 (1986)

    1. No.16
    2. No.15
    3. No.14
    4. No.13
    5. No.12
    6. No.11
    7. No.10
    8. No.9
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  40. Vol. 71 (1985)

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    3. No.14
    4. No.13
    5. No.12
    6. No.11
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  41. Vol. 70 (1984)

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    3. No.14
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    5. No.12
    6. No.11
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  42. Vol. 69 (1983)

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    3. No.14
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  43. Vol. 68 (1982)

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  44. Vol. 67 (1981)

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    5. No.12
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  45. Vol. 66 (1980)

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    3. No.12
    4. No.11
    5. No.10
    6. No.9
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  46. Vol. 65 (1979)

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  47. Vol. 64 (1978)

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  48. Vol. 63 (1977)

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    3. No.12
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    6. No.9
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  49. Vol. 62 (1976)

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  50. Vol. 61 (1975)

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    7. No.9
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  51. Vol. 60 (1974)

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  52. Vol. 59 (1973)

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  53. Vol. 58 (1972)

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  54. Vol. 57 (1971)

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  55. Vol. 56 (1970)

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  56. Vol. 55 (1969)

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  57. Vol. 54 (1968)

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  58. Vol. 53 (1967)

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  59. Vol. 52 (1966)

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  60. Vol. 51 (1965)

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  61. Vol. 50 (1964)

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  62. Vol. 49 (1963)

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  63. Vol. 48 (1962)

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  64. Vol. 47 (1961)

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  65. Vol. 46 (1960)

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  66. Vol. 45 (1959)

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  67. Vol. 44 (1958)

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  68. Vol. 43 (1957)

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  69. Vol. 42 (1956)

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  70. Vol. 41 (1955)

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Tetsu-to-Hagané Vol. 101 (2015), No. 11

Water Model Study of Viscosity Effect on Mold Powder Entrapment

Manabu Iguchi, Yusuke Nakahata, Masafumi Zeze, Hideaki Yamamura, Masahiro Tani

pp. 559-565

DOI:

10.2355/tetsutohagane.TETSU-2015-049

Abstract

Water model experiments were carried out to understand the mechanism of mold powder entrapment. The main objective is to clarify an effect of the viscosity of mold powder on the entrapment. Water and silicone oils of different viscosities were used as the working fluids. Onset of the entrapment was judged by eye inspection and using a high-speed camera. The critical water flow velocity at the interface was measured with a laser Doppler velocimetry (LDV) to describe the onset condition. The results were compared with a previously proposed analytical equation without containing the viscosity effect to highlight the effect.

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Water Model Study of Viscosity Effect on Mold Powder Entrapment

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The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

Aya Harashima, Kimihisa Ito

pp. 566-573

DOI:

10.2355/tetsutohagane.TETSU-2015-053

Abstract

Blast furnace (BF) slags have been utilized in cement, concrete aggregate, roadbed materials, and earthwork materials. If an appropriate control of the elution and compound formation is developed under severer environmental conditions, their usage would be more diverse. Because the chemical composition of BF slag is similar to that of Portland cement, the possibility of ettringite (3CaO·Al2O3·3CaSO4·32H2O) formation from BF slag following a mechanism similar to that of cement hydration might be possible under a wet alkaline environment. Therefore, the effect of an alkaline solution on ettringite formation from BF slags was investigated by slag-leaching experiments and thermodynamic calculations using PHREEQC. The formation of ettringite was observed only for the high pH solutions in the experiments, whereas its thermochemical possibility from the air-cooled BF slags was always expected by the calculation. The kinetic analysis showed that the dissolution of alumina from the slag may control the whole reaction rate. The mixing of granulated BF slag with air-cooled ones tended to enhance the ettringite formation. Furthermore, a technique for removing the ettringite formed in the slag was also developed.

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The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

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Development of Stochastic Model of Production Time and Estimation Technology for Standard Production Time in a Plate Mill

Masanori Shioya, Junichi Mori, Kuniharu Ito, Yasushi Mizutani, Kenji Torikai

pp. 574-583

DOI:

10.2355/tetsutohagane.TETSU-2015-024

Abstract

Accurate estimation of the standard production time in steel plate mills is crucial for making successful production plans. Due to the complicated and stochastic processes of the steel plate mills, it is challenging and time-consuming to build precise mechanistic models which enable the estimation of the precise production time. To overcome this limitation, we propose a method to estimate the accurate standard production time from the historical process data instead of mechanistic models. In our method, decision trees are employed to identify the process flow for each order. Then the probability distribution of the process time for each process is computed by means of the maximum likelihood estimation. These probability distributions are combined into one probability distribution of the total production time in accordance with the predicted process flow. Finally, the standard production time is defined as the corresponding time with cumulative density function of the probability distribution at the specified confidence level. Real world steel production process data have been used to examine the effectiveness of the proposed approach. The results demonstrate that the new standard production time can increase the rate of production completion no later than the deadlines as well as shorten the average production time one to three days.

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Development of Stochastic Model of Production Time and Estimation Technology for Standard Production Time in a Plate Mill

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Effect of Both Iron Content and Lubricated Layer on the Sliding Performance of Galvannealed Steel Sheet

Shoichiro Taira, Hiroshi Tsunekawa, Katsuya Hoshino, Yuji Yamasaki, Michitaka Sakurai, Naoto Yoshimi, Yoshiharu Sugimoto

pp. 584-589

DOI:

10.2355/tetsutohagane.TETSU-2015-027

Abstract

The effect of iron content of zinc layer and lubricated layer on sliding performance of the galvannealed steel sheets (GA) was investigated.
The effect of iron content on friction coefficient for lubricated GA was dependent on the sliding condition. For the condition in which the contact pressure is high, the friction coefficient increased with the increase of iron content of GA. However, for the condition in which the pressure is low, the friction coefficient decreased with the increase of iron content. This tendency of the friction coefficient was also observed in the fender model press forming test.
When the contact pressure is high, more oil pockets were formed on the surface due to the increase of the plateau area. Therefore, the friction coefficient decreased since the partial pressure was sustained in the oil pockets. Since the GA coating with low iron content is softer than that with high iron content, the friction coefficient of lubricated GA increased with the increase of iron content.
On the other hand, when the contact pressure is low, the oil pocket was not formed on the surface. In addition, the lubricated layer is easily worn since the tool length is long and the lubricant surface is more damaged than in the case of short length tool. Therefore, the friction coefficient is affected by the adhesion between tool and GA surface. This is why the tendency of iron content on friction coefficient for GA and lubricated GA is similar.

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Effect of Both Iron Content and Lubricated Layer on the Sliding Performance of Galvannealed Steel Sheet

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Effect of Initial Ni Plating on the Structure and Hardness of Electrodeposited Ni-W Alloys with and without Annealing

Shinichiro Hayata, Satoshi Oue, Takehiro Takahashi, Hiroaki Nakano

pp. 590-597

DOI:

10.2355/tetsutohagane.TETSU-2015-050

Abstract

Electrodeposition of Ni-W alloys was conducted from an unagitated sulfate solution containing citric acid at pH 5 and 60 °C under coulostatic (9.0×105) and galvanostatic (100-5000 A·m–2) conditions onto steel sheets with an initial Ni plating, and the effect of initial Ni plating on the structure and hardness of deposited Ni-W alloys was investigated before and after annealing. The precipitates of Ni4W and NiW were observed in deposits obtained at all the current densities after annealing, irrespective of having undergone initial Ni plating or not. Without initial Ni plating, a lot of large precipitates occurred in the vicinity of steel substrate, while the fine precipitates occurred with initial Ni plating. Without initial Ni plating, the W content in deposits increased in the vicinity of steel substrate due to diffusion of Ni in deposits into steel substrate during annealing. With initial Ni plating, the W content in deposits in the vicinity of Ni plating decreased due to diffusion of Ni in Ni plating into deposits during annealing. Before annealing, W content in deposits was lower with initial Ni plating than that without Ni plating. With initial Ni plating, W content in deposits was lower and Ni diffused from Ni plating to deposits during annealing, as a result, the formation of large precipitates of Ni4W and NiW seems to be suppressed. The hardness of deposited Ni-W alloys after annealing increased when the precipitates of Ni4W and NiW became uniform and fine.

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Effect of Initial Ni Plating on the Structure and Hardness of Electrodeposited Ni-W Alloys with and without Annealing

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Effect of Annealing Duration on the Structure and Hardness of Electrodeposited Ni-W alloys

Shinichiro Hayata, Satoshi Oue, Takehiro Takahashi, Hiroaki Nakano

pp. 598-604

DOI:

10.2355/tetsutohagane.TETSU-2015-051

Abstract

Electrodeposition of Ni-W alloys was conducted from an unagitated sulfate solution containing citric acid at pH 5 and 60 °C under coulostatic (9.0×105) and galvanostatic (100-3000 A·m–2) conditions onto steel sheets with an initial Ni plating to investigate the effect of annealing duration on the structure and hardness of deposited Ni-W alloys. The crystallite size of Ni in deposits with several seconds annealing increased significantly compared to without annealing, and gradually increased with annealing duration. With increasing the holding time at 700 °C to 100 and 1000 s, the precipitates of Ni4W and NiW were increased and became coarse at upper layers of deposits. The hardness of all the deposits increased with annealing, and the degree of increase became significantly large with increasing W content in deposit by increasing current density. The hardness of deposit with W content 45 mass% was maximum at holding time of 10 s at 700 °C, and gradually decreased with increasing annealing duration. The hardness of deposits increased when the precipitates of Ni4W and NiW were uniformly distributed in a fine size, which showing the optimum precipitation state at holding time of 10 s at 700 °C.

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Effect of Annealing Duration on the Structure and Hardness of Electrodeposited Ni-W alloys

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Characteristic Fatigue Crack Growth Behavior of Low Carbon Steel Under Low-pressure Hydrogen Gas Atmosphere in an Ultra-low Frequency

Yosuke Ohnishi, Motomichi Koyama, Daisuke Sasaki, Hiroshi Noguchi

pp. 605-610

DOI:

10.2355/tetsutohagane.TETSU-2015-018

Abstract

In order to clarify an influence of hydrogen on the fatigue crack propagation in ultra-low frequency region, we investigated the crack propagation rates of S10C at different frequencies in hydrogen and nitrogen atmospheres. In the low-pressure hydrogen gas atmosphere, the crack propagation rate decreased with decreasing in frequency within the present experimental range. In particular, the crack propagation rate in the ultra-low frequency (10–3 Hz) became the same as that in nitrogen atmosphere. To explain the disappearance of the hydrogen effect in the ultra-low frequency, we proposed that carbon diffusion causing strain-age hardening also contributes to the decrease in crack propagation rate in the ultra-low frequency under the hydrogen atmosphere.

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Characteristic Fatigue Crack Growth Behavior of Low Carbon Steel Under Low-pressure Hydrogen Gas Atmosphere in an Ultra-low Frequency

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Recrystallization Behavior and Texture Evolution in Severely Cold-rolled Fe-0.3Mass%Si and Fe-0.3Mass%Al Alloys

Miho Tomita, Tooru Inaguma, Hiroaki Sakamoto, Kohsaku Ushioda

pp. 611-618

DOI:

10.2355/tetsutohagane.TETSU-2015-043

Abstract

The effect of Si and Al additions on the recrystallization behavior of severely cold-rolled Fe by 99.8% reduction was investigated in comparison with a previous study on pure Fe6). In Fe-0.3mass%Si alloy, recrystallized grain with {411} <011> and {411} <148> preferentially nucleated at an early stage of recrystallization, and the texture did not changed substantially with the progress of recrystallization, which supports the oriented nucleation theory. The {411} <148> texture significantly increased at the expense of recrystallized grains with {100} <023> and {322} <236> during normal grain growth. In Fe-0.3mass%Al alloy, dynamic recovery during heavy cold-rolling and substantial subgrain growth during low temperature annealing (350˚C) occurred, similar to the case of pure Fe and different from that of Fe-0.3mass%Si alloy. This is presumably because of the subtle influence of Al addition on cross-slip frequency and smaller solute-vacancy interaction as compared with Si addition. Furthermore, at the early stage of recrystallization, nuclei had similar orientations as cold-rolling texture. With the progress of recrystallization, {100} <012> and {111} <112> orientations intensified. In the following normal grain growth, {100} <012> texture intensified. However, the change in the texture during growth cannot be explained only by the size effect. A rigorous grain growth simulation model is required to explain the experimental facts by considering the dependency of grain boundary mobility and energy on grain boundary characteristics.

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Recrystallization Behavior and Texture Evolution in Severely Cold-rolled Fe-0.3Mass%Si and Fe-0.3Mass%Al Alloys

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Effect of One-Pass ECAP prior to Cold Rolling on the Deformation Structure and Recrystallization in Ferritic Stainless Steel Sheets

Hiroshi Fujiwara, Mitsuaki Adachi, Hiroyuki Miyamoto, Masaharu Hatano

pp. 619-625

DOI:

10.2355/tetsutohagane.TETSU-2015-047

Abstract

Equal-channel angular pressing (ECAP) was applied to ferritic stainless steel sheets for one pass prior to cold rolling in order to improve formability and alleviate ridging of the sheets. Effect of the channel angle of ECAP (90° and 120°) on the deformation microstructure and the subsequent recrystallization was focused. One-pass ECAP indeed modified the cold-rolled microstructures, texture and subsequent recrystallization as compared with that in cold rolling alone. In particular, grain-scale shear bands are introduced during ECAP in otherwise hard-to-recrystallize <100>//ND grains by ECAP, and they facilitated the recrystallization. However, the effect of reducing the channel angle from 120°to 90°on the recrystallization and the formability was limited in spite of higher shear strain imposed on the sheets. The reduction of the channel angle affects an increase of misorientation between the shear band and the matrix and does not increase the density of shear band.

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Effect of One-Pass ECAP prior to Cold Rolling on the Deformation Structure and Recrystallization in Ferritic Stainless Steel Sheets

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