Investigation on mechanism of type IV cracking in P92 steel at 650 °C

被引：41
|
作者：
Zhao, Lei [1 ,2 ]
Jing, Hongyang [1 ,2 ]
Xu, Lianyong [1 ,2 ]
An, Junchao [1 ,2 ]
Xiao, Guangchun [1 ,2 ]
Xu, Delu [3 ]
Chen, Yucheng [3 ]
Han, Yu [3 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[2] Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
[3] China Elect Power Res Inst, Beijing 100055, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH | 2011年 / 26卷 / 07期
基金：
高等学校博士学科点专项科研基金;
关键词：
HEAT-AFFECTED ZONE; WELDED-JOINTS; CREEP; DEFORMATION; DEGRADATION; STRENGTH; WELDMENT; DESIGN; DAMAGE; P122;
D O I：
10.1557/jmr.2011.11
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Welded joints of P92 steel subjected to creep testing at 650 degrees C and 70 MPa were investigated. Type IV cracking was observed in the fine-grained heat-affected zone (FGHAZ) of the welded joints by optical microscopy. It was found that with varying creep times, the number of creep voids increased at an accelerating rate and the maximum number of voids was formed in the FGHAZ. Scanning electron microscopy observations revealed that precipitates were formed in the interior of creep voids, suggesting that the nucleation of the creep voids is related to the precipitates. These creep voids then connected with each other, isolated the grain from the matrix, and formed zigzag microcracks, leading to type IV cracking. New coarse carbides-the Laves phase and Cr7C3-were precipitated during creep. These carbides can deteriorate the creep strength and stimulate the nucleation of creep voids in the FGHAZ.
引用
收藏
页码：934 / 943
页数：10
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