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Tetsu-to-Hagané Vol. 103 (2017), No. 10

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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  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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  35. Vol. 76 (1990)

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  36. Vol. 75 (1989)

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  37. Vol. 74 (1988)

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  38. Vol. 73 (1987)

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  39. Vol. 72 (1986)

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    4. No.13
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  40. Vol. 71 (1985)

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  41. Vol. 70 (1984)

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  42. Vol. 69 (1983)

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  43. Vol. 68 (1982)

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  44. Vol. 67 (1981)

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  45. Vol. 66 (1980)

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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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  49. Vol. 62 (1976)

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  50. Vol. 61 (1975)

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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. 103 (2017), No. 10

Influence of Temperature Distribution in Combustion Chamber on Coke Cake Discharging Behavior

Koki Terui, Takashi Matsui, Kiyoshi Fukada, Yusuke Dohi

pp. 555-563

DOI:

10.2355/tetsutohagane.TETSU-2017-035

Abstract

To achieve stable operation of coke oven battery, numerical model for estimating clearance between coke cake and coke oven wall were developed. By developed model, influence of temperature distribution in combustion chamber on coke cake contraction was investigated. As a results, following findings were obtained.1) Drop of temperature in coke side (CS) gives higher drop of clearance at the end of coke chamber compared with machine side (MS).2) Drop of clearance at the end of CS causes higher pushing load of coke cake. Therefore, improvement of CS flue temperature is important for lowering pushing force of coke cake, particularly.

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Influence of Temperature Distribution in Combustion Chamber on Coke Cake Discharging Behavior

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Development of Large-Scale Pot Sinter Simulator with Material Segregation Charging System

Osamu Ishiyama, Kyosuke Hara, Masaru Matsumura, Kenichi Higuchi, Seiji Nomura

pp. 564-569

DOI:

10.2355/tetsutohagane.TETSU-2017-007

Abstract

It is indispensable to construct sinter pot in large-scale and to apply material segregation charging equipment, for there exist several significant dissimilarities between practical and lab-scale sinter facilities. From the issue, sinter pot for 300 kg material mixture with segregation charging system called ‘sinter simulator’ is developed. The system allows segregated materials being charged into fixed pot with proper sequential order, according to the result of stacking properties. In this paper, it is reported that stable and proper sintering procedure is obtained, and phenomena more precise to practical process is also simulated, confirming the results of product yield recovered with core sampler.

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Development of Large-Scale Pot Sinter Simulator with Material Segregation Charging System

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Comparison of the Measurements of Austenite Volume Fraction by Various Methods for Mn-Si-C Steel

Yo Tomota, Nobuaki Sekido, Pingguang Xu, Takuro Kawasaki, Stefanus Harjo, Masahiko Tanaka, Takehisa Shinohara, Yuhua Su, Akira Taniyama

pp. 570-578

DOI:

10.2355/tetsutohagane.TETSU-2017-045

Abstract

Various methods were employed to measure the austenite volume fraction in a 1.5Mn-1.5Si-0.2C steel. It has been confirmed that the volume fractions determined by transmission electron microscopy, scanning electron microscopy/electron back scatter diffraction, X-ray diffraction and neutron diffraction exhibit a general trend to become larger in this order, although the values obtained by X-ray and neutron diffraction are similar in the present steel because austenite is relatively stable. The austenite volume fractions determined by diffraction methods have been found to be affected by the measuring specimen direction, i.e., texture, even by applying the conventional correcting procedure. To avoid this influence, it is recommended to measure both of volume fraction and texture simultaneously using neutron diffraction. Although synchrotron X-ray shows higher angle resolution, its small incident beam size brings poor statistic reliability. The influence of texture cannot be avoided for transmission Bragg edge measurement, either, which must be overcome to realize 2D or 3D volume fraction mapping.

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Comparison of the Measurements of Austenite Volume Fraction by Various Methods for Mn-Si-C Steel

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Effect of Intercritical Quenching on Mechanical Properties of Cu-containing Low Alloy Steel

Yuta Honma, Kunihiko Hashi, Gen Sasaki, Takuya Okawa, Kotobu Nagai

pp. 579-588

DOI:

10.2355/tetsutohagane.TETSU-2017-006

Abstract

Better balance of strength and toughness is a strong demand for the ASTM A707 L5 grade steel. In the present study, therefore, the combination of hardening by Cu precipitates and toughening by quenching from a dual-phase (α+γ) region, so-called intercritical quenching or lamellarizing, has been investigated for a better balance of strength and toughness. The combination procedure resulted in a drastic increase in toughness at low temperatures with a slight decrease in yield strength.The lamellarizing brought about a complicated microstructure with meandered high angle grain boundaries (HAGB) and fine grains bordered by the HAGB. The final microstructure was composed of granular bainitic ferrites without retained γ and basically dual of a softer phase and a harder phase. The softer phase inherited the not-transformed α phase region in lamellarizing and contained coarse Cu precipitates. The harder phase inherited the transformed γ phase region in lamellarizing and contained no Cu precipitates. Hence, over-aging of Cu precipitation in the softer phase might result in the slight decrease in yield strength.In the present steel, the retained γ has nothing to do with the improved toughness. Hence, the effective grain size (dEFF) approach was verified to account for the microstructural effect on toughness. The unit microstructure to determine the dEFF was identified to be the bainitic ferrite grain bordered by the HAGB. The refinement of the dEFF through lamellarizing can be attributed to the improved toughness.

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Effect of Intercritical Quenching on Mechanical Properties of Cu-containing Low Alloy Steel

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Experimental Evaluation of Work-hardening Behavior Using Simple Shear Test and Formulation of Strain Dependence of Work-hardening Exponent for Steel Sheets

Satoshi Shirakami, Tohru Yoshida, Toshihiko Kuwabara

pp. 589-596

DOI:

10.2355/tetsutohagane.TETSU-2017-037

Abstract

Simple shear tests and hydraulic bulge tests of IF steel sheet, 590 and 980 MPa grade dual phase high strength steel sheets were carried out to investigate the work-hardening behavior, i.e. equivalent stress-equivalent plastic strain curves and Instantaneous n-values, in large strain region over uniform elongation. Parameter κ that correlates simple shear (or bulge) stress to uniaxial tensile stress used to obtain the equivalent stress-equivalent plastic strain curve. The work-hardening behaviors obtained by simple shear tests and bulge test were good agreement with those of uniaxial tensile test. On the other hands, work-hardening equations proposed by previous studies were less likely to reproduce behaviors of the Instantaneous n-value, i.e. a strain dependency of the n-value, in a variety of steel sheets. Thus a new work-hardening equation that can reproduce the strain dependency of the n-value proposed. This equation can reproduce the work-hardening behavior of a variety of steel sheets.

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Experimental Evaluation of Work-hardening Behavior Using Simple Shear Test and Formulation of Strain Dependence of Work-hardening Exponent for Steel Sheets

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High-speed Tensile Deformation Behavior of 1 GPa-grade TRIP-aided Multi-phase Steels

Noriyuki Tsuchida, Satoshi Ohkura, Takaaki Tanaka, Yuki Toji

pp. 597-605

DOI:

10.2355/tetsutohagane.TETSU-2017-044

Abstract

High-speed deformation behavior and their strain rate dependence on mechanical properties of 1 GPa-grade TRIP-aided multi-phase (TRIP) steels were studied. The strain rate range in this study was between 3.3×10–6 and 103 s–1, and the effect of retained austenite (γR) shapes on TRIP effect in the 1 GPa-grade TRIP steel was also focused on. The effects of strain rate on tensile strength and flow stress in the TRIP steels were small whereas that on uniform elongation was large. The strain rate dependences on tensile strength and uniform elongation in the TRIP steels were more closely to those of the metastable austenitic stainless steels than the conventional TRIP and dual-phase steels. The 1 GPa-grade TRIP steel with the γR shape of needle-like showed better tensile properties and absorbed energy in the present strain rate range. The volume fraction of γR more than 20% and the matrix microstructure of martensite seem to be important factors in the high-strength TRIP steels.

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High-speed Tensile Deformation Behavior of 1 GPa-grade TRIP-aided Multi-phase Steels

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Control of Swirl Motion of a Bottom Blown Bath using an Immersed Circular Disk

Tomohiko Tatsumi, Koji Mori, Manabu Iguchi

pp. 606-608

DOI:

10.2355/tetsutohagane.TETSU-2017-042

Abstract

Gas injection systems are extensively employed in the steelmaking industry for mixing molten metal baths and, hence, for removing impurities and nonmetallic inclusions such as C, P, S, and Al2O3. A bath subjected to bottom gas injection is sometimes accompanied by a swirl motion of the deep-water wave type when the aspect ratio of the bath, HL/D, ranges from about 0.3 to about unity. Here, HL is the bath depth and D is the bath diameter. Although the swirl motion has high mixing ability, it causes vessel oscillations in the vertical and horizontal directions. Accordingly, the conventional refining processes are usually operated in the absence of the swirl motions. In a previous water model study a method of suppressing the swirl motion was proposed. A circular disk was set in contact with the surface of a water bath. The size of the disk capable of suppressing the swirl motion was experimentally clarified. In this study a circular disk was immersed in the bath to investigate the possibility of suppressing the swirl motion more effectively.

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Control of Swirl Motion of a Bottom Blown Bath using an Immersed Circular Disk

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