著者

牛尾 誠夫

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.73, no.10, pp.1309-1315, 1987-08-01 (Released:2009-06-19)

参考文献数

23

被引用文献数

1 2

著者

角山 浩三 今中 誠 古川 九州男 岸田 朗 山田 恭裕

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.75, no.11, pp.2090-2097, 1989-11-01 (Released:2009-06-19)

参考文献数

5

被引用文献数

4 4

---

The influence of base metal surface roughness parameters on the clarity of painted automotive cold rolled sheet steels was investigated. The sheet steels were dull finished by shot blasting, electro-discharge texturing or laser dull texturing. It was found that the painted clarity improved with decreasing of Ra, while it scarcely depended on PPI. Characteristic of the surface profiles of base metal was the waviness with wavelength of hundreds micron. Whose trace remained after coating and deteriorated the clarity. In shot blasting, the dendritic microstructure and the statistical fluctuation of grit collision generated the waviness and made it difficult to control its wavelength. And, in electro-discharge texturing, it is suggested, controlling the waviness is difficult similarly. In laser dull texturing, it was possible to reduce the wavelength of waviness to less than hundreds micron and then to improve the clarity without deteriorating the press formability. A larger fraction of flat portion in laser dull texture was also responsible for the improvement of clarity.

著者

小山 元道 澤口 孝宏 津﨑 兼彰

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.104, no.4, pp.187-200, 2018 (Released:2018-03-31)

参考文献数

86

被引用文献数

6

---

This paper presents an overview of the recent works on dynamic strain aging (DSA) of Fe-Mn-C austenitic steels including Hadfield and twinning-induced plasticity (TWIP) steels. First, a model of the DSA mechanism and its controlling factors are briefly explained in terms of Mn-C coupling and dislocation separation. Then, we introduce the effects of DSA on mechanical properties such as work hardening capability, uniform elongation, post-uniform elongation, and fatigue strength. Specifically, we note the pinning effect on extended dislocation for the work hardening, the Poretvin-Le Chatelier banding effect on damage evolution for the elongation, and the crack tip hardening/softening effect on crack resistance for the fatigue strength. We believe that this overview will help in designing advanced high-strength steels with superior ductility and fatigue resistance.

著者

河西 健一

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.54, no.13, pp.1325-1326, 1968-11-01 (Released:2010-10-12)

著者

堀切 政康

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.16, no.10, pp.1063-1086, 1930-10-25

著者

堀切 政康

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.15, no.12, pp.1099-1161_16, 1929-12-25

著者

武智 弘

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.78, no.3, pp.339-345, 1992-03-01 (Released:2009-05-29)

参考文献数

15

被引用文献数

1

著者

春日井 守 竹内 玉行 加藤 昭年 大河内 敏博 植松 伸夫

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.72, no.13, 1986-09-09

著者

萬谷 志郎 井口 泰孝 本多 弘 石塚 晴彦

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.71, no.7, pp.846-852, 1985-05-01 (Released:2010-01-19)

参考文献数

18

被引用文献数

2 3

---

The heat of mixing of silica(β-cristobalite) with liquid wustite melted in an iron vessel has been directly measured at 1420°C by the modified isoperibol calorimeter(iso-thermal jacket type). Mixing of solid silica with liquid wustite is an exothermic reaction and the measured heat, ΔHFetO(l)-SiO2(β-cristobalite), is about-900cal/mol at the fayalite composition. Heats of mixing of liquid silica with liquid wustite, ΔHMFetO(l)-SiO2(l), are obtained by the combination of this direct measured results and heat of fusion of SiO2 in the reference. This result is discussed in comparison with the estimated values by the thermochemical data and by the assumption of the regular solution.

著者

村山 順一郎 北山 司郎 幸 英昭 志田 善明 市橋 弘行

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.72, no.5, 1986-03-04

著者

絹川 武良司

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.18, no.11, pp.1206-1232, 1932-11-25

著者

絹川 武良司

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.18, no.6, pp.563-582, 1932-06-25

著者

金子 秀夫

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.56, no.5, pp.622-635, 1970-04-01

被引用文献数

8

著者

星 秀夫 佐々木 稔

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.91, no.1, pp.103-107, 2005-01-01 (Released:2009-06-19)

参考文献数

4

被引用文献数

2 4

---

供試材である日本刀の三振りを切断し多くの項目について調査した結果,炭素以外の諸元素が極めて少ない高純度の炭素鋼であることが鍛接性を良くし耐食性を高め,また刀身全表面に圧縮残留応力をもたせることが日本刀の靱性をさらに強化すること等が確認できたことである.

著者

黒岩 大助

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.62, no.7, pp.916-925, 1976-06-01 (Released:2010-02-22)

被引用文献数

1

著者

Masao OGASAWARA Toshitaka TAMANO Hiroshi MIMURA Samon YANAGIMOTO Yukihisa KURIYAMA

出版者

The Iron and Steel Institute of Japan

雑誌

Tetsu-to-Hagane (ISSN:00211575)

巻号頁・発行日

vol.64, no.7, pp.947-957, 1978-06-01 (Released:2010-02-22)

参考文献数

16

被引用文献数

1 1

---

A laboratory test for unstable ductile fracture of mild steels was developed. Shear crack was initiated from very deep notch. Some devices such as “pipe tabs” were employed to reduce the stiffness of the system enough to make shear crack continue to grow in an unstable manner.Four kinds of pipe materials were tested using the present test method and three kinds of them with low ductility showed unstable ductile fracture. Fracture toughness for the onset of unstable ductile fracture in these steels was evaluated and was correlated successfully to Cvshelf, upper shelf of absorbed energy in Charpy test.Slow crack growth test was also performed by means of high stiffness tensile system, “R-cruve” to ductile crack growth being obtained experimentally. A model to ductile crack growth was proposed by the use of the modification of Dugdale model, by which R-curves were finely described. Critical G-values for the onset of the unstable ductile crack propagation were shown to be well compared to the values estimated from the R-curves.Thus, both the ductile slow growth and its rapid propagation are shown to be well characterised by the values of notch ductility.

著者

上部 伊織 道原 健人 森下 浩平 柳楽 知也 安田 秀幸

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.12, pp.678-687, 2017 (Released:2017-11-30)

参考文献数

27

被引用文献数

5

---

This study demonstrates in-situ measurement of solute partition coefficient in multicomponent alloys, using X-ray transmission imaging and X-ray florescence spectroscopy. The developed technique was applied to determine partition coefficients of Cr, Ni and Mo between δ phase and liquid phase in Fe-17.4Cr-12.6Ni-2.0Mo-1.6Mn-0.6Si alloys (mass%). In the observation and measurement, X-ray fluorescence spectra were directly obtained by irradiating the incident X-ray beam (23keV) to the solid phase or the liquid phase near solid/liquid interface. The partition coefficients were simply determined from the X-ray florescence analysis. In addition, successive measurements during unidirectional solidification allowed to measure change in partition coefficient along solidification path. During the solidification, partition coefficients of Cr, Ni and Mo changed from 1.01 to 1.08, from 0.76 to 0.70 and from 0.86 to 0.74, respectively. The present study proved that the developed technique was applicable to determine partition coefficients of 3d and 4d transition elements of which characteristic X-ray energies ranged from 4 to 20keV.

著者

生沼 駿 高久 歴 中谷 祐二郎 齊藤 大蔵 今井 潔

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.9, pp.549-554, 2017 (Released:2017-08-31)

参考文献数

14

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In this study, the effect of Ni and Cr composition on mean thermal expansion coefficient (CTE) and γ’-Ni3 (Al, Ti) strengthening microstructure of austenitic heat resistant steel, Alloy 286, was investigated. The measurements revealed that the CTE of Alloy 286 decreases at wide range of temperature up to 800°C with addition of Ni and reduction of Cr concentration. The magnetization-temperature curve showed that the magnetic transition temperature, which the alloy transforms to ferromagnetic state to paramagnetic state, raise with addition of Ni and reduction of Cr. The CTE of alloys had good relations with magnetic transition temperature and mean valence electron numbers (e/a), suggesting that the magneto-volume (invar) effect and the suppression of lattice expansion strongly appear at high Ni and low Cr concentration. Ni and Cr optimized alloy exhibits γ phase microstructure with fine γ’ particles dispersed within the grain, and the hardness of grain interior is larger than Alloy 286. This alloy has low CTE comparable to conventional ferritic steels, together with higher strength than conventional austenitic steels.

著者

本間 祐太 橋 邦彦 佐々木 元 大川 琢哉 長井 寿

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.10, pp.579-588, 2017 (Released:2017-09-30)

参考文献数

18

被引用文献数

2

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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.

著者

荒木 理 藤井 浩平 赤間 大地 土山 聡宏 高木 節雄 大村 孝仁 高橋 淳

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.8, pp.491-497, 2017 (Released:2017-07-31)

参考文献数

28

被引用文献数

15

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Effect of aging treatment at 373 K on Hall-Petch coefficient (ky) was investigated in consideration of the change in friction stress associated with carbide/nitride precipitation in ferritic steels containing 60 ppm carbon or nitrogen (C60 and N60). Tensile tests revealed that the ky was monotonously increased with increasing aging time in both steels, and also, C60 exhibited a larger ky value than that of N60 under the same aging time. As a result of 3DAP analysis and theoretical calculation for grain boundary segregation of carbon and nitrogen, the ky corresponded to the amount of carbon and nitrogen existing at grain boundary. There was no difference in the effect on ky increment between both elements. The larger ky in C60 under the same aging condition was due to the larger amount of segregated carbon compared with nitrogen.