中文摘要：

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。

英文摘要：

The impact behavior of three high manganese austenite steels with w（Mn）= 14.8G （No. 1）, w（Mn）= （No. 2） and w（Mn） =33.0H （No. 3） was studied by using Charpy impact test. The results indicated that 1 steel showed brittle behavior from -196 ℃ to 20℃ and the TRIP effect （transformation induced plasticity） occurred during the impact tests. However, the No. 3 steel showed excellent ductile behavior even at a very low temperature of -196 ℃ The deformation twins were found after impact test. Therefore, it proved twinning induced plasticity （TWIP effect） occurred during the impact process. Whereas the No. 2 steel exhibited a ductileto-brittle transition temperature of about -80℃. And both the TRIP effect and the TWIP effect were detected for No. 2 steel. With decreasing temperature both the TRIP effect and the TWlP effect were notable.