Effects of Cr and Mo on Mechanical Properties of Hot-Forged Medium Carbon TRIP-Aided Bainitic Ferrite Steels

被引：20

作者：

Sugimoto, Koh-ichi ^{[1
]}

Sato, Sho-hei ^{[2
]}

Kobayashi, Junya ^{[3
]}

Srivastava, Ashok Kumar ^{[4
]}

机构：

[1] Shinshu Univ, Grad Sch Sci & Technol, Dept Mech Syst Engn, Nagano 3808553, Japan

[2] Sato Press Co Ltd, Dept Prod Engn, Toyota 4730933, Japan

[3] Ibaraki Univ, Grad Sch Sci & Engn, Dept Mech Engn, Hitachi, Ibaraki 3168511, Japan

[4] OP Jindal Univ, Sch Engn, Dept Met Engn, Raigarh 496109, India

来源：

METALS | 2019年 / 9卷 / 10期

关键词：

hot-forging; microalloying; TRIP-aided bainitic ferrite steel; retained austenite; tensile property; impact toughness; RETAINED AUSTENITE CHARACTERISTICS; STRENGTH; MICROSTRUCTURE; TOUGHNESS; TRANSFORMATION; DUCTILITY; ENHANCEMENT; DESIGN;

D O I：

10.3390/met9101066

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the effects of Cr and Mo additions on mechanical properties of hot-forged medium carbon TRIP-aided bainitic ferrite (TBF) steel were investigated. If 0.5%Cr was added to the base steel with a chemical composition of 0.4%C, 1.5%Si, 1.5%Mn, 0.5%Al, and 0.05%Nb in mass%, the developed steel achieved the best combination of strength and total elongation. The best combination of strength and impact toughness was attained by multiple additions of 0.5%Cr and 0.2%Mo to the base steel. The excellent combination of strength and impact toughness substantially exceeded those of quenched and tempered JIS-SCM420 and 440 steels, although it was as high as those of 0.2%C TBF steels with 1.0%Cr and 0.2%Mo. The good impact toughness was mainly caused by uniform fine bainitic ferrite matrix structure and a large amount of metastable retained austenite.

引用

页数：13

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