IN718镍基高温合金的热机械疲劳性能

被引：17

作者：

邓文凯 ^{[1
,2
]}

徐睛昊 ^{[1
,2
]}

江亮 ^{[1
,2
]}

机构：

[1] 中南大学粉末冶金国家重点实验室

[2] 中南大学粉末冶金研究院

来源：

中国有色金属学报 | 2019年 / 29卷 / 05期

关键词：

IN718镍基高温合金; 热机械疲劳; 同相; 反相; 疲劳寿命; 断口;

D O I：

10.19476/j.ysxb.1004.0609.2019.05.11

中图分类号：

TG132.3 [特种热性质合金];

学科分类号：

080502 ;

摘要：

对IN718镍基高温合金进行温度循环为350～650℃及不同应变幅条件下的同相(IP)和反相(OP)热机械疲劳试验;比较同相和反相的热机械疲劳循环应力响应行为、滞后回线以及疲劳寿命;运用金相显微镜、扫描电子显微镜对材料的微观结构以及断口特征进行分析。结果表明:IN718合金的热机械疲劳应力-应变滞后回线最大拉应力与压应力不对称,表明合金在350～650℃范围内高温时抵抗变形阻力较小;合金的循环应力响应行为在低应变幅的同相热机械疲劳的高温半周呈现循环硬化现象,其余情况均为循环软化现象;合金的同相热机械疲劳寿命明显低于反相热机械疲劳寿命,合金热机械疲劳寿命在应变幅超过0.6%的条件下符合Coffin-Manson方程,在应变幅0.4%的情况下实际疲劳寿命值偏高;IN718合金的同相热机械疲劳的疲劳源处断口为沿晶断裂,反相热机械疲劳的为穿晶断裂,裂纹扩展区和瞬断区均为韧窝断裂。

引用

页码：983 / 989

页数：7

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