EFFECT OF Mg ON CREEP BEHAVIOR OF A Ni-BASE SUPERALLOY.

被引：0
|
作者：
Ma, Peili [1 ]
Zhuang, Jingyun [1 ]
Zhu, Jing [1 ]
Yang, Jinyan [1 ]
Zhong, Zengyong [1 ]
Gao, Liang [1 ]
机构：
[1] Central Iron & Steel Research, Inst, Beijing, China, Central Iron & Steel Research Inst, Beijing, China
来源：
Jinshu Xuebao/Acta Metallurgica Sinica | 1987年 / 23卷 / 06期
关键词：
MOLYBDENUM METALLOGRAPHY - Segregation - SUPERALLOYS - Additives;
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摘要：
Sufficient Mg addition in a Ni-base superalloy results in strengthening of gamma prime phase which decreases the steady state creep rate. Segregation of Mg to grain boundaries (GB) causes a rise in GB fracture energy that retards crack initiation and propagation and extends the 2nd and 3rd creep stage. Accommodation between deformations at GB and in grains may also be improved by addition of Mg, thus increasing creep ductility. The fracture mechanism changes from wedge cracking to cavity cracking.
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