Micromechanism of Decrease of Impact Toughness in Coarse-Grain Heat-Affected Zone of HSLA Steel with Increasing Welding Heat Input

被引：58
作者：
Cao, R. [1 ,2 ]
Li, J. [1 ,2 ]
Liu, D. S. [3 ]
Ma, J. Y. [1 ,2 ]
Chen, J. H. [1 ,2 ]
机构：
[1] Lanzhou Univ Technol, State Key Lab Gansu Adv Proc & Recycling Nonferro, Minist Educ, Lanzhou 730050, Peoples R China
[2] Lanzhou Univ Technol, Key Lab Nonferrous Met Alloys, Minist Educ, Lanzhou 730050, Peoples R China
[3] Shasteel, Inst Res Iron & Steel, Zhangjiagang 215623, Jiangsu, Peoples R China
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2015年 / 46A卷 / 07期
关键词：
MICROSTRUCTURE; SIZE;
D O I：
10.1007/s11661-015-2916-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper analyzes the micromechanism of decrease of impact toughness with increasing the welding heat input in coarse-grain heat-affected zone (CGHAZ) of a low-alloy high-strength ship-building steel plate. By comparing the microstructures, measuring the extending length of the fibrous crack, identifying the critical event of cleavage fracture, measuring the critical length, and calculating the local cleavage fracture stress sigma (f), and then using the basic principles of the micromechanism of cleavage fracture, this work reveals the essential causes of deteriorated toughness in the CGHAZ of high-strength steel welded joints.
引用
收藏
页码：2999 / 3014
页数：16
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