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在300～700℃,以应变速率为2×10-4s-1对316L不锈钢进行拉伸试验,探索其中的动态应变时效现象及其规律。结果表明,316L奥氏体不锈钢在动态应变时效温度区间并没有出现屈服应力平台,在450～700℃既有正常的Portevien-Le Chatelier effect(PLC)效应,也有反PLC效应;锯齿形成的有效激活能为254 kJ/mol;扩散着Cr等置换型溶质原子与运动位错之间的交互作用使材料出现动态应变时效,导致锯齿流动行为。
Tensile tests were carried out on 316L stainless steel at 300-700 ℃ with a strain rate of 2 × 10-4s-1 to explore the dynamic strain aging phenomenon and its regularity. The results show that the 316L austenitic stainless steel does not have yield stress in the dynamic strain aging temperature range. It has both the normal Portevien-Le Chatelier effect (PLC) effect and the anti-PLC effect at 450-700 ℃. The effective activation of sawtooth formation Which can be 254 kJ / mol. The interaction between displacement solute atoms, such as Cr, and the motion dislocations diffuses into the material and leads to dynamic strain aging, resulting in the sawtooth flow behavior.