NNN
~试验研究~
含2%Ru单晶镍基高温合金变行为的研究
梁爽，刘智鑫，付颖，李秋鹤
（营口理工学院机电工程系，辽宁营口115014）
摘要：测定了一种含2%Ru单晶镍基高温合金的端变性能，观察了它的组织形貌。据此计算了合金在不
同温度和应力条件下的端变激活能和应力指数，以研究合金的端变行为和组织演变规律。结果表明，合金在高温、低应力条件下的嫣变激活能Q为484.6kJ/mol,应力指数n为4.5；在中温、高应力条件下的端变激活能Q为496.9kJ/mol，应力指数n为12.3。这说明，合金在高温低应力条件下的蠕变机制为位错在基体中滑移以及位错越过相攀移，而在中温高应力条件下的端变机制为位错剪切进入相。对端变试件近断口区组织形貌的观察发现，在高温、低应力条件下，相形成N形状结构；在中温、高应力条件下，相尺寸增大但不发生筏状转变，相和相发生扭曲。
关键词：单晶镍基高温合金；端变；位错；Ru
中图分类号：TG111.8
文献标识码：A
文章编号：1008-1690(2016)03-0013-06
ResearchonCreepBehaviorsofaSingleCrystalNickel-Base
SuperalloyContaining2%Ru
LIANG Shuang,LIUZhixin,FU Ying,LI Qiuhe
( Yingkou Institute of Technology Department of Electrical and Mechanical
Engineering, Yingkou 115014, Liaoning China)
Abstract: Creep property of a single crystal nickel-base superalloy containing 2% Ru was measured, and its microstructure was surveyed. On these grounds, both creep activation energy and stress exponent of the alloy were calculated in the case of different temperatures and different stresses to investigate the creep behavior and microstructural inversion of the alloy. The results indicate that the creep activation energy ( Q) is 484. 6 kJ/mol, and the stress exponent (n) is 4. 5 in the case of both high temperature and low stress, and that the creep activation energy (Q) is 496. 9 kJ/mol, and the stress exponent (n) is 12. 3 in the case of both intermediate temperature and high stress. The foregoing results show that when the temperature is higher and the stress is lower, the alloy creeping is caused by both slipping of dislocation in the matrix and climbing of dislocation over ' phase, and that when the temperature is intermediate and the stress is higher, the alloy creeping is caused by shearing of dislocation into ' phase. From survey of microstructure in region near fracture of the creep sample it is found thal in the case of both high temperature and low stress the y' phase is a N-shaped raft structure, and that in the case of both intermediate temperature and high stress the ' phase increases in size but do not become a raft structure, and and ' phases will twist
Key words: single crystal nickel-base superalloy; creep; dislocation; Ru
镍基单晶高温合金是由Ni、Ta、W、Mo、Co、Cr、 Re、Ru、C、B、Hf、AI等较多元素组成，其组织结构相对简单，仅由基体和强化相组成，强化相
收稿日期：2016-01-20
以共格的方式镶嵌在基体相中()。虽然镍基单晶高温合金已经消除了晶界，但螨变失效仍然是合金在服役期间的主要失效形式12-3]。位错的不断运
作者简介：梁免（1983-），女，辽宁营口人，研究方向为镍基单晶高温合金。联系电话：13604171451,E-mail：
356463612@qq.com
基金项目：营口理工学院青年自然科学基金资助项目（QNI201513）
《热处理》
万方数据
2016年第31卷
第3期
· 13 ·