Liquation of various phases in HAZ during welding of cast Inconel 738LC

被引：40
作者：
Ojo, OA [1 ]
Richards, NL [1 ]
Chaturvedi, MC [1 ]
机构：
[1] Univ Manitoba, Dept Mech & Ind Engn, Winnipeg, MB R3T 5V6, Canada
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2004年 / 20卷 / 08期
关键词：
cast nickel base superalloys; heat affected zone; liquation;
D O I：
10.1179/026708304225019948
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The weld heat affected zone (HAZ) of tungsten inert gas (TIG) welded cast IN 738 superalloy has been examined. HAZ microfissuring was observed in alloy welded in solution treated and overaged conditions. Closer and careful microstructural examination by analytical scanning electron microscopy revealed the liquation of boride, sulphocarbide, MC type carbides, gamma precipitate particles and gamma - gamma eutectic, which were present in the preweld alloy, and the formation of resolidified constituents along the microtissured HAZ grain boundaries, thereby indicating that HAZ cracking in this alloy involves liquation cracking. Liquation of these phases, as well as characteristics of the intergranular liquid film contributing to the low resistance to HAZ cracking of the alloy have been examined and are discussed.
引用
收藏
页码：1027 / 1034
页数：8
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