Toughness improvement by Zr addition in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels

被引：35

作者：

Liu, Yu ^{[1
,2
,3
]}

Li, Guangqiang ^{[1
,2
,3
]}

Wan, Xiangliang ^{[1
,2
]}

Zhang, Xianguang ^{[4
]}

Shen, Yu ^{[2
]}

Wu, Kaiming ^{[1
,2
,3
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China

[2] Wuhan Univ Sci & Technol, Key Lab Ferrous Met & Resources Utilizat, Minist Educ, Wuhan 430081, Hubei, Peoples R China

[3] Wuhan Univ Sci & Technol, Int Res Inst Steel Technol, Wuhan, Hubei, Peoples R China

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi, Japan

来源：

IRONMAKING & STEELMAKING | 2019年 / 46卷 / 02期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

CGHAZ; impact toughness; particles; acicular ferrite; fracture; IN-SITU OBSERVATION; FERRITE TRANSFORMATION; DEOXIDIZED STEEL; ACICULAR FERRITE; MN DEPLETION; MICROSTRUCTURE; INCLUSIONS; BEHAVIOR; INPUT;

D O I：

10.1080/03019233.2017.1353763

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of Zr addition on the microstructure and impact toughness in the coarse-grained heat-affected zone (CGHAZ) of high-strength low-alloy steels subjected to 100 kJ cm(-1) heat input was investigated. The second- phase particles were mainly Al-Ti complex oxides and (Ti,Nb)N precipitates in Zr-free steel, whereas lots of finer Zr-Al-Ti complex oxides and (Al,Ti,Nb)N precipitates were formed in Zr-bearing steel because of Zr addition. These finer oxides and precipitates effectively restricted the austenite grain growth by pinning effect during welding thermal cycle, and smaller and more uniform prior austenite grains were obtained in CGHAZ of Zr-bearing steel. Furthermore, more acicular ferrite grains nucleated on Zr-Al-Ti complex oxides, inducing formation of fine-grained microstructure in CGHAZ of Zr-bearing steel. The toughness improvement in CGHAZ of Zr-bearing steel with dimple fracture surface was attributed to the grain refinement by pinning effect and acicular ferrite formation.

引用

页码：113 / 123

页数：11

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