摘要
研究321不锈钢高温低周疲劳过程中的动态应变时效行为,并分析不同温度下疲劳迟滞回线以及峰值应力曲线.结果表明:动态应变时效锯齿屈服行为仅发生在550℃以上;在高温疲劳试验中锯齿屈服大多发生在疲劳前10周,10周之后锯齿屈服现象减弱或者消失;应变幅值越小,锯齿幅度越小,消失越快.
This work studied the DSA behavior during high temperature LCF testing of 321 stainless steel. Through analyzing the hysteresis loops and peak stress curves at different temperatures, the results showed that most of serrated yielding behavior appeared at the first 10 cycles of LCF and then weakened. In addition, strain amplitude also had an effect on serrated yielding amplitude. The lower the strain amplitude was, the lower the serrated yielding amplitude became, and the faster the serrated yielding behavior vanished.
出处
《同济大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2014年第9期1391-1394,共4页
Journal of Tongji University:Natural Science
关键词
321不锈钢
动态应变时效
锯齿屈服
低周疲劳
321 stainless steel
dynamic strain aging
serrated yielding
low cycle fatigue