High toughness in the intercritically reheated coarse-grained (ICRCG) heat-affected zone (HAZ) of low carbon microalloyed steel

被引：50

作者：

Hu, Jun ^{[1
]}

Du, Lin-Xiu ^{[1
]}

Wang, Jian-Jun ^{[2
]}

Xie, Hui ^{[1
]}

Gao, Cai-Ru ^{[1
]}

Misra, R. D. K. ^{[3
]}

机构：

[1] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

[2] Northeastern Univ, Sch Met & Mat, Inst Mat Res, Shenyang 110819, Peoples R China

[3] Univ Louisiana Lafayette, Ctr Struct & Funct Mat, Lab Excellence Adv Steel Res, Lafayette, LA 70504 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 590卷

关键词：

ICRCG HAZ; Peak temperature; Toughness; Ultra-fine grain; V-N microalloyed steel; LOW-ALLOY STEEL; FERRITE NUCLEATION; INTRAGRANULAR FERRITE; MICROSTRUCTURES; TEMPERATURE; INITIATION; MECHANISM; BAINITE;

D O I：

10.1016/j.msea.2013.10.062

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Motivated by the small lattice mismatch between ferrite and vanadium nitride (VN), we describe here the welding thermal cycle simulation that provides high toughness in the ICRCG HAZ of low carbon V-N steel. This unique behavior is attributed Lathe formation of ultra-fine grained ferrite along prior austenite grain boundaries generated by the first pass welding thermal cycle with high misorientation boundaries, where V(C, N) precipitates provide potential nucleation sites for ferrite, leading to extraordinary refinement of martensite/austenite (M/A) constituent. Nitrogen stimulates the precipitation behavior of V(C, N). The nucleation of high density of V(C, N) precipitates consumes carbon-content in the austenite, leading to decrease in the carbon-content in the M/A constituent, with consequent decrease in hardness. The increase in toughness is explained in terms of Griffith's crack propagation theory. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：323 / 328

页数：6

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