Effect of martensite-austenite constituent on toughness of simulated inter-critically reheated coarse-grained heat-affected zone in X70 pipeline steel

被引：33
作者：
Di, X. J. [1 ,2 ]
An, X. [1 ,2 ]
Cheng, F. J. [1 ,2 ]
Wang, D. P. [1 ,2 ]
Guo, X. J. [3 ]
Xue, Z. K. [4 ]
机构：
[1] Tianjin Univ, Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Sch Mat Sci & Engn, 92 Weijin Rd, Tianjin 300072, Peoples R China
[3] Transportat Safety Oil & Gas Pipeline, Natl Engn Lab, Langfang 065000, Peoples R China
[4] China Petr Pipeline Bur, Langfang 065000, Peoples R China
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2016年 / 21卷 / 05期
关键词：
X70 pipeline steel; Thermal cycle; Martensite-austenite constituent; Microstructure characteristic; Toughness; LOW-ALLOY STEEL; FRACTURE-TOUGHNESS; MICROSTRUCTURE;
D O I：
10.1080/13621718.2015.1118814
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The inter-critically reheated coarse-grained heat-affected zone (ICCGHAZ) of X70 pipeline steel with different second peak temperature and heat input was simulated in this study by means of Gleeble3500 simulator. The volume fraction, size, shape and distribution of martensite-austenite (M-A) constituent were analysed. The toughness of ICCGHAZ and corresponding fractographs were examined. The results showed that the distribution of M-A was strongly influenced by second peak temperature, and M-A constituent with necklace structure at lower second peak temperature led to worse toughness. The volume fraction and size of M-A were strongly affected by heat input, the volume fraction of M-A constituent increased with the increase of heat input; the volume fraction and size of M-A were key factors of toughness deterioration; the interfacial energies and the initiation of crack were related to the shape of M-A constituent.
引用
收藏
页码：366 / 373
页数：8
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