Effect of heat treatment on delayed fracture resistance of high strength steel 30CrMnSi2NiNb

被引：0
作者：
Wang, MQ [1 ]
Dong, H
Hui, WJ
Chen, SL
Weng, YQ
机构：
[1] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
[2] Chinese Soc Met, Beijing 100711, Peoples R China
来源：
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2003年 / 10卷 / 01期
关键词：
high strength steel; heat treatment; mixed microstructure; delayed fracture;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The steel specimens of nominal composition 0.3C-1. 0Cr-1.0Mn-2.0Si-1.0Ni-0.04 Nb were quenched and tempered or isothermally quenched from various temperatures. It is found that the steel quenched and tempered with a tensile strength of 1 500-1 600 MPa has a K-ISCC(critical stress intensity factor) value below 15.0 MPa . m(1/2). The steel isothermally quenched with a tensile strength of 1 350-1 750 MPa has a K (ISCC) value about 20.0 MPa . m(1/2). In addition, with increase of isothermal quenching temperature, the tensile strength decreases greatly and K-ISCC value does not pronouncedly change. The microstructure of isothermally quenched specimens is composed of bainite and retained austenite. The delayed fracture resistance is dependent on the stability of austenite, which is in turn related to the retained austenite volume fraction and carbon content in austenite.
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页码：44 / 48
页数：5
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