Effect of Low Temperature Aging on Hall-Petch Coefficient in Ferritic Steels Containing a Small Amount of Carbon and Nitrogen

被引：20

作者：

Araki, Satoshi ^{[1
]}

Fujii, Kohei ^{[2
,3
]}

Akama, Daichi ^{[4
,5
]}

Tsuchiyama, Toshihiro ^{[4
,5
]}

Takaki, Setsuo ^{[4
,5
]}

Ohmura, Takahito ^{[6
]}

Takahashi, Jun ^{[7
]}

机构：

[1] Kyushu Univ, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[2] Kyushu Univ, Yasugi, Shimane 6920014, Japan

[3] Hitachi Met, Yasugi, Shimane 6920014, Japan

[4] Kyushu Univ, Grad Sch Engn, Dept Mat Sci & Engn, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPII CNER 2, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[6] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[7] Nippon Steel & Sumitomo Met Corp, Adv Technol Res Labs, Chiba 2938511, Japan

来源：

ISIJ INTERNATIONAL | 2018年 / 58卷 / 10期

关键词：

grain boundary segregation; age hardening; grain refinement strengthening; ferritic steel; Hall-fetch relationship; GRAIN-BOUNDARY SEGREGATION; INTERSTITIAL ELEMENTS; YIELD-STRESS; IRON; PRECIPITATION; ALLOYS; MN;

D O I：

10.2355/isijinternational.ISIJINT-2018-130

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In this study, the effect of aging treatment at 373 K on Hall fetch coefficient (k(y)) was investigated by considering the change in friction stress associated with carbide/nitride precipitation in ferritic steels containing 60 mass ppm carbon or nitrogen (C60 and N60). Tensile tests revealed that the k(y) monotonously increased with increasing aging time in both steels. Additionally, C60 exhibited a k(y) value exceeding that of N60 with respect to the same aging time. The results of the 3DAP analysis and theoretical calculation for the grain boundary segregation of carbon and nitrogen indicated that the k(y) corresponded to the amount of carbon and nitrogen existing at the grain boundary. No difference in the effect on increments in k(y) between the two elements was observed. The increase in k(y) in C60 under the same aging condition was due to the higher amount of segregated carbon when compared with that of nitrogen.

引用

页码：1920 / 1926

页数：7

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