Comparison of Microstructure and Hardness between High-carbon and High-nitrogen Martensites

被引：15
|
作者：
Tsuchiyama, Toshihiro [1 ,2 ]
Inoue, Kurato [3 ,4 ]
Hyodo, Katsutoshi [5 ]
Akama, Daichi [6 ,7 ]
Nakada, Nobuo [8 ]
Takaki, Setsuo [9 ]
Koyano, Tamotsu [10 ]
机构：
[1] Kyushu Univ, Dept Mat Sci & Engn, Nishi Ku, 744 Moto Oka, Fukuoka, Fukuoka 8190395, Japan
[2] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI 12CNER, Nishi Ku, 744 Moto Oka, Fukuoka, Fukuoka 8190395, Japan
[3] Kyushu Univ, Fukuoka, Fukuoka, Japan
[4] NS Solut Co, Chuo Ku, Tokyo Sumitomo Twin Bldg East Tower 27-1, Tokyo 1040033, Japan
[5] Kyushu Univ, Nishi Ku, 744 Moto Oka, Fukuoka, Fukuoka 8190395, Japan
[6] Kyushu Univ, Dept Mat Sci & Engn, Fukuoka, Fukuoka, Japan
[7] Mitsubishi Heavy Ind Co Ltd, 2-1-1 Shinhama Arai Cho, Takasago, Hyogo 6768686, Japan
[8] Tokyo Inst Technol, Dept Mat Sci & Engn, Midori Ku, 4259 Nagatsuta Cho, Yokohama, Kanagawa 2268503, Japan
[9] Kyushu Univ, Steel Res Ctr, Nishi Ku, 744 Moto Oka, Fukuoka, Fukuoka 8190395, Japan
[10] Univ Tsukuba, Cryogen Div, Res Facil Ctr, 1-1-1 Tennoudai, Tsukuba, Ibaraki 3058577, Japan
来源：
ISIJ INTERNATIONAL | 2019年 / 59卷 / 01期
关键词：
lenticular martensite; lath martensite; midrib; carbon; nitrogen; hardness; retained austenite; dislocation density; solid solution strengthening; LATH MARTENSITE; FE-C; STRENGTH; CRYSTALLOGRAPHY; MORPHOLOGY; TRANSFORMATION; TEMPERATURE; AUSTENITE; BEHAVIOR; SIZE;
D O I：
10.2355/isijinternational.ISIJINT-2018-404
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.
引用
收藏
页码：161 / 168
页数：8
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