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利用控轧控冷工艺开发了锰质量分数为18.8%的热轧高锰TRIP/TWIP钢板,分析了轧制工艺参数对热轧高锰钢组织和性能的影响,讨论了实验钢的断裂机理。结果表明:通过控轧控冷方法可以热轧出抗拉强度达到940 MPa左右,断裂伸长率在40%以上的高锰钢板。冷却速度和卷取温度等工艺参数对实验钢组织性能影响不是非常明显。高锰钢优异的力学性能是TRIP和TWIP效应共同作用的结果。高锰钢拉伸呈韧性断裂,裂纹多沿奥氏体/马氏体晶界萌生、扩展。
The hot rolled high manganese TRIP / TWIP steel with a mass fraction of 18.8% was developed by controlled rolling and controlled cooling process. The influence of rolling parameters on the microstructure and properties of hot rolled high manganese steel was analyzed. The fracture mechanism of the experimental steel was discussed. The results show that high-manganese steel with tensile strength up to 940 MPa and elongation at break above 40% can be hot-rolled by controlled rolling and controlled cooling. The effects of cooling rate and coiling temperature on the microstructure and properties of the experimental steel are not obvious. The excellent mechanical properties of high manganese steel are the result of the combined effect of TRIP and TWIP. High manganese steel tensile ductile fracture, crack along the austenite / martensite grain boundary initiation, expansion.