Investigation of abnormal high impact toughness in simulated welding CGHAZ of a 8%Ni 980 MPa high strength steel

被引：15

作者：

Cao, R. ^{[1
,2
]}

Feng, W. ^{[3
]}

Peng, Y. ^{[4
]}

Du, W. S. ^{[4
]}

Tian, Z. L. ^{[4
]}

Chen, J. H. ^{[1
,2
]}

机构：

[1] Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China

[2] Lanzhou Univ Technol, Key Lab Nonferrous Met Alloys, Minist Educ, Lanzhou 730050, Peoples R China

[3] Harbin Welding Inst, Harbin 150080, Peoples R China

[4] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 528卷 / 02期

关键词：

8%Ni high strength steel; Heat affected zone; Impact toughness; Ductile fracture; HEAT-AFFECTED ZONES; FRACTURE-TOUGHNESS; MICROSTRUCTURE;

D O I：

10.1016/j.msea.2010.09.053

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

It is well known that the toughness in the coarse grain heat affected zone (CGHAZ) is of the lowest in the heat affected zone (HAZ) of a HSLA steel welding joint. In the present work although the grain size in the simulated CGHAZ was as large as 100-300 mu m and its tensile strength and elongation were lower than those of the fine grain heat affected zone (FGHAZ), however its Charpy V impact toughness at room temperature reached 193J, which was appreciably higher than 138J of the simulated FGHAZ with grain size of 30 mu m. This abnormal phenomenon was investigated in this paper by analyzing the micromechanism of ductile rupture in associated microstructures and taking account of the effects of stress triaxiality. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.

引用

页码：631 / 642

页数：12

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