321不锈钢低周疲劳过程中的动态应变时效

Dynamic Strain Aging in 321 Stainless Steel During Low Cycle Fatigue Test

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.