Effect of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of X52 Linepipe HFIW Joints

被引：15

作者：

Sisi, A. Kavousi ^{[1
]}

Mirsalehi, S. E. ^{[1
]}

机构：

[1] Amirkabir Univ Technol, Dept Min & Met Engn, Tehran, Iran

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2015年 / 24卷 / 04期

关键词：

linepipe; mechanical properties; microstructure; post-weld heat treatment; X52; steel; AUSTENITE GRAIN-SIZE; STEEL; TEMPERATURE; TOUGHNESS;

D O I：

10.1007/s11665-015-1423-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present paper, influences of normalization heat treatment on microstructural and mechanical properties of high-frequency induction welded (HFIW) joints of X52 steel have been investigated. HFIW joints were post-weld heat treated at different times and temperatures. The microstructure and mechanical properties of the heat treated joints were then comprehensively investigated. Based on the results, a proper normalization of the primary fine grain steel caused the grain size to increase; but because of converting brittle microstructure into ductile microstructure, it caused the toughness to increase also. In addition, the ductility of the joints was enhanced. Nevertheless, tensile strength, yield strength, and hardness were reduced. The results showed that 950 A degrees C was the optimum normalization temperature from the standpoint of fracture toughness for the X52 steel joints. At 1050 A degrees C, the carbides and/or nitrides in the steel dissolved, and excessive grain growth occurred. Hence, the maximum allowable temperature for normalization was found to be 1000 A degrees C.

引用

页码：1626 / 1633

页数：8

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