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对3种不同锰含量的高锰奥氏体钢进行了低温冲击实验,分析了其冲击变形行为。实验结果表明:在-196~20℃温度区间冲击时,w(Mn)=14.8%(1号)的高锰钢均为脆性断裂,冲击过程中发生了形变诱发塑性(TRIP效应);w(Mn)=33.0%(3号)的高锰钢,即使在-196℃冲击时,仍呈现出韧性断裂,冲击过程中出现了形变诱导孪晶(TWIP效应);w(Mn)=18.8%(2号)的高锰钢有韧脆转变区间,韧脆转变温度约为-80℃,在冲击过程中同时存在TRIP和TWIP效应。随冲击温度降低,TRIP和TWIP效应更显著。
Three kinds of high manganese austenitic steels with different Mn contents were subjected to low temperature impact test and the impact deformation behavior was analyzed. The experimental results show that the high manganese steel with w (Mn) = 14.8% (No.1) is brittle fracture and the TRIP effect occurs during the impact from -196 ℃ to 20 ℃; w (Mn) = 33.0% (No.3), showing ductile fracture even at -196 ° C impact and TWIP effect during impact; w (Mn) = 18.8% ( 2) high manganese steel has a ductile-brittle transition range, ductile-brittle transition temperature of about -80 ℃, both in the impact of TRIP and TWIP effect. As the impact temperature decreases, the TRIP and TWIP effects are more pronounced.