刘谨,赵志毅

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

利用Gleeble-3500热模拟实验机模拟了GH141高温合金焊接及焊后热处理过程,固溶处理后采用1020℃~875℃区间6组不同温度以及300 s~1800 s区间5组不同时间分别进行一次时效,然后在相同工艺下进行二次时效,研究一次时效温度和时间对整个热处理过程应力变化及碳化物分布的影响。结果表明,一次时效温度对应力变化趋势影响较大,温度越低,开始时应力越高,且在1020、960与875℃三个温度时应力呈下降趋势,940℃时应力先上升后下降,980℃与900℃时应力呈上升趋势,总体来说在960℃处理时应力值较低且平稳,且960℃时碳化物分布均匀并呈点链状,对强化晶界有利;不同一次时效时间下应力变化趋势基本一致,但在1200 s后应力出现回弹现象,且处理时间越长,二次时效时应力峰值出现时间越早。

关键词(KeyWords)： 高温合金;时效;应力;碳化物

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘谨,赵志毅

DOI: 10.13289/j.issn.1009-6264.2017.02.011

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