Microstructure Characteristics of 617B Tube and 740H Pipe TIG Welding Joints for 700 °C Ultra-supercritical Power Plant Boilers

被引：0
|
作者：
Ye Jianshui [1 ]
Dong Jianxin [1 ]
Zhang Maicang [1 ]
Xie Xishan [1 ]
机构：
[1] Univ Sci & Technol Beijing, Beijing 100083, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2015年 / 44卷 / 09期
关键词：
617B; 740H; TIG; microstructure; microhardness; FUSION ZONE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructure and microhardness of 617B tube and 740H pipe TIG welding joints was studied by OM, SEM and HV tester. Results show that epitaxial growth of grains in FZ of 617B weld is obvious, Mo and Ti are the principal segregated elements, and the interdendritic region consists of discontinuous second phase particle M6C. The FZ hardness is slightly higher than that of BM. On the other hand, Nb and Ti are the principal segregated elements in FZ of 740H weld and the interdendritic region consists of discrete irregular second phase particle MC. gamma-gamma' eutectic microconstituents aren't observed. In HAZ, grains grow somewhat, while the total gamma' decrease. In addition, M23C6 and MC in HAZ grain boundary are dissolved to matrix. The FZ hardness is clearly lower than that of BM.
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页码：2189 / 2195
页数：7
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