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鉄と鋼 Vol. 107 (2021), No. 8

ISIJ International
belloff

Grid List Abstracts
オンライン版ISSN: 1883-2954
冊子版ISSN: 0021-1575
発行機関: 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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  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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  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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    4. No.9
    5. No.8
    6. No.7
    7. No.6
    8. No.5
    9. No.4
    10. No.3
    11. No.2
    12. No.1

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21 Dec. (Last 30 Days)

鉄と鋼 Vol. 107 (2021), No. 8

石炭の流動性およびコークス強度に対する芳香族アミンの添加効果

大塚 啓司, 土肥 勇介, 松井 貴, 花田 一利

pp. 617-623

DOI:

10.2355/tetsutohagane.TETSU-2021-016

抄録

Coal fluidity is an important parameter in coal blending techniques for coke making because it strongly influences coke qualities. On the other hand, recently, the amount of high fluidity coal has been limited. To cope with this problem, caking additive method which improves fluidity of coal has been developed and commercialized. However, since tight supply of high fluidity coal is anticipated in the future, it is of great importance to develop more effective caking additive. Therefore, in this study, we investigated effect of 11 kinds of polyaromatic hydrocarbons which include oxygen, sulfur and nitrogen containing compounds on coal fluidity in order to search for more effective chemical substances. The additives were added to low fluidity coal, and fluidity analyses were carried out according to the Gieseler plastometer method. Addition of sulfur and oxygen containing compounds lowered fluidity of coal, whereas addition of aromatic amines enhanced fluidity of coal. Coal fluidity ameliorated with increasing the molecular weight of aromatic amine, and N, N'-di-2-naphthyl-1, 4-phenylenediamine (DNPD) was the most effective aromatic amine in this study. Carbonization tests in an electric furnace were conducted to investigate an effect of DNPD on coke strength. As a result of adding only 1 wt% DNPD, fluidity of blended coal and coke strength (Drum Index) were highly improved.

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石炭の流動性およびコークス強度に対する芳香族アミンの添加効果

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微細粒子群侵入現象に及ぼす粒子群の速度および質量流速,液浴流速の影響

久志本 惇史, 笠原 秀平

pp. 624-632

DOI:

10.2355/tetsutohagane.TETSU-2021-030

抄録

RH water model experiments were carried out in order to evaluate penetrating phenomena of fine particles into liquid. Effects of particle velocity, particle mass flow rate and liquid velocity on deposition of fine particles on liquid surface, and amount of penetrated particle into liquid were investigated. The following results were obtained:(1) Particle layer was formed on liquid surface and prevented penetration of particles when fine particles were blown.(2) Weight of particle layer decreased with increase of of particle velocity and liquid velocity, with decrease particle mass flow rate.(3) Amount of penetrated particle into liquid increased with decrease of weight of particle layer.

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微細粒子群侵入現象に及ぼす粒子群の速度および質量流速,液浴流速の影響

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パノラマ振動カメラを用いた広域コンベア稼働モニタリング

島崎 航平, Zulhaj Muhammad Aliansyah, 妹尾 拓, 石井 抱, 伊藤 友彦

pp. 633-643

DOI:

10.2355/tetsutohagane.TETSU-2021-013

抄録

In this study, we propose a novel non-contact vision sensing method for wide-area monitoring of operation of conveyors in ironworks by using a panoramic vibration camera in real time. This method can capture magnified images including vibration contribution from single camera with mirror-driven based viewpoint switching. The small vibrations and rotations in multiple pillars and belts were detected using a function of a full-pixel vibration spectrum imaging which can calculate peak frequencies from time frequency responses. Through some experiments of different situation, such as loading and unloading, we evaluate the efficiency of this method which can monitor the operation of multiple rollers and conveyors, when the camera located in 15 m or more away from the conveyors to be monitored.

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パノラマ振動カメラを用いた広域コンベア稼働モニタリング

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鋼中微細析出物生成状態の解析

石田 智治, 山田 克美, 山内 克久

pp. 644-651

DOI:

10.2355/tetsutohagane.TETSU-2020-112

抄録

Fine precipitates in steel have various effects on the properties of steel products. Therefore, it is important to investigate the state of existence of precipitates in steel in order to consider their effect on the material. In this study, the size and shape of Nb and V precipitates were observed by electron microscopy and the amount of precipitation was evaluated by electrolytic extraction analysis in austenitic stainless steels which has excellent heat resistance. For steels with a certain chemical composition, stable nitride (Cr2N) formation was observed when only Nb was added, whereas combined addition of Nb and V suppressed the formation of Cr2N and produced extremely fine precipitates in the steel (in lath martensite). The fine precipitates could be observed in thin film samples by using a high-resolution transmission electron microscope (TEM). In order to evaluate the state of formation of the fine precipitates in the steel quantitatively, the difference in the precipitation behaviors of the two materials was investigated by the size-classified quantitative analysis method. This method is considered to be a useful analytical technique in the development and design of high performance steels using fine nitrides and carbides with sizes of the several nm level.

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鋼中微細析出物生成状態の解析

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転動疲労における水素侵入挙動と侵入水素のトラップサイト

亀谷 美百合, 真鍋 敏之, 松井 直樹, 山﨑 真吾, 大村 朋彦

pp. 652-660

DOI:

10.2355/tetsutohagane.TETSU-2021-018

抄録

Hydrogen absorption behavior and microstructural change of carburized JIS SCr420 steels containing different amounts of retained austenite in rolling contact fatigue were investigated. The thermal desorption analysis confirmed hydrogen desorption at the second-peak between 423 and 623 K after rolling contact fatigue. The hydrogen concentration at the second-peak increased with number of cycles in the rolling contact. This increment was larger when using the steel with a higher amount of retained austenite before the fatigue test. The increment of hydrogen concentration at the second-peak was large even when the introduction of new dislocations due to the martensitic transformation of retained austenite was considered to be small. The activation energies of desorption for the second-peak hydrogen were calculated to be 50.6 kJ·mol−1 for the steel with 10.4% retained austenite and 55.8 kJ·mol−1 for the steel with 4.9% retained austenite. The activation energies of cathodically charged 0.8%C steels with 10.9% and 6.0% retained austenite, simulating carburized layer before the test, were 36.2 and 42.2 kJ·mol−1, respectively. This means that the activation energy of hydrogen desorption increased during rolling contact. The absorbed hydrogen during the rolling contact fatigue was likely trapped in more stable trapping sites related to the retained austenite which were formed under cyclic stress.

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転動疲労における水素侵入挙動と侵入水素のトラップサイト

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極低炭素フェライト系ステンレス鋼におけるSn，Pの粒界偏析が靭性に及ぼす影響

寺岡 慎一, 関 彰

pp. 661-671

DOI:

10.2355/tetsutohagane.TETSU-2020-126

抄録

Grain boundary segregation of Sn in 16.5 mass%Cr-0.15 mass%Ti steel and 16.5 mass%Cr-0.40 mass%Nb steel was investigated along with its toughness effects. Comparing ductile-brittle transition temperature (DBTT) after aging at 973 K for 3.6 ks, the increase in DBTT per 0.1 mass% Sn addition was twice as large for 0.15 mass%Ti steel as for 0.4 mass%Nb steel, and their brittle fracture surfaces were mainly intergranular in 0.15 mass%Ti steel and intragranular in 0.4 mass%Nb steel, respectively. The grain boundary segregation of Sn was also recognized in the 0.4 mass%Nb steel, suggesting that the intergranular embrittlement was suppressed by the intergranular reinforcement of Nb. In 16.5 mass%Cr-0.15 mass%Ti-0.3 mass%Sn-P steels after various aging time and temperature, it was found that the amount of the grain boundary segregation of Sn changed by the precipitation amount of the phosphorous compound and P content, indicating that there is a site competition effect (SC effect) in the grain boundary segregation of Sn and P. The grain boundary segregation energy of Sn estimated from this study was ‐46 kJ/mol, which was similar to the reported value of the carbon steel. As P content increased from 0 to 0.03 mass%, the grain boundary segregation amount of Sn after aging at 773 K for 604.8 ks was decreased from 4.3 at% to the bulk concentration, which is lower than the segregation amount of Sn estimated from the grain boundary segregation energy of P in the carbon steel, suggesting that due to the effect of the Cr content, the grain boundary segregation energy of P decreased by about 1.4-fold compared to the carbon steel.

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極低炭素フェライト系ステンレス鋼におけるSn，Pの粒界偏析が靭性に及ぼす影響

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超高強度低合金TRIP鋼の疲労特性に及ぼす母相組織と窒素添加の影響

北條 智彦, 小林 純也, 杉本 公一, 竹元 嘉利, 長坂 明彦, 小山 元道, 秋山 英二

pp. 672-680

DOI:

10.2355/tetsutohagane.TETSU-2021-015

抄録

To develop ultrahigh-strength steels for automotive impact safety parts, the effects of the microstructure and nitrogen content on the fatigue properties of ultrahigh-strength low alloy transformation-induced plasticity (TRIP)-aided steels with martensite (TM), bainitic ferrite-martensite (TBM), and bainitic ferrite (TBF) matrices were investigated. Compared to TBF steels, both the TM and TBM steels achieved high tensile strength, of more than 980 MPa, and excellent fatigue properties. This results from the suppression of crack propagation due to the effective TRIP of the relatively stable interlath retained austenite and the increase in tensile and yield strengths attributed to the low isothermal transformation treatment. The fatigue strengths of the ultrahigh-strength low alloy TRIP-aided steels were slightly increased by the addition of 100 ppm of nitrogen. The increase in fatigue strength of TM, TBM, and TBF steels with 100 ppm of nitrogen was caused by the fine and uniform martensite and bainitic ferrite matrices and retained austenite, along with the increase in carbon concentration in the retained austenite due to the precipitation of AlN.

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超高強度低合金TRIP鋼の疲労特性に及ぼす母相組織と窒素添加の影響

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ひずみ可視化シートを用いた不均一ひずみの検出:リューダース変形の例

楊 志鵬, 小山 元道, 不動寺 浩, 北條 智彦, 秋山 英二

pp. 681-686

DOI:

10.2355/tetsutohagane.TETSU-2021-028

抄録

An opal photonic crystal film was applied to characterize local strain evolution associated with Lürders band propagation in an annealed low carbon steel. A local change in color of the opal film was observed, which corresponded to the propagation of the Lürders band. In particular, we carried out two tensile experiments for line and area analyses of RGB (Red-Green-Blue) values of the opal films pasted on the specimens. Both of the experiments clearly exhibited a quantitative correspondence between color variation and local strain evolution, namely, the present study demonstrated the potential of the opal films to analyze heterogeneous strain evolution in steels.

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ひずみ可視化シートを用いた不均一ひずみの検出:リューダース変形の例

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Orowan modelならびにAshby-Orowan modelで見積もられた粒子分散強化の比較

高木 節雄, 塚原 真宏

pp. 687-691

DOI:

10.2355/tetsutohagane.TETSU-2021-010

抄録

In the steels with different particle dispersion, particle dispersion strengthening Δσ was theoretically estimated by Orowan model and Ashby-Orowan model. The comparison of experimental data with theoretical values proved the reasonability of Orowan model rather than Ashby-Orowan model. In Ashby-Orowan model, the line tension coefficient of dislocation is evaluated much smaller and this leads to the under-estimation of Δσ. It was also confirmed that there is no effect of grain size on 0.2% proof stress of the steels used. As a result, it is concluded that the yield stress of steels with finely dispersed particle can be explained by the addition of friction stress and particle dispersion strengthening, in the case the grain size is sufficiently larger than the particle dispersion spacing.

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Orowan modelならびにAshby-Orowan modelで見積もられた粒子分散強化の比較

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