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利用光学显微镜、力学和磁性性能测试设备对热轧态和水韧处理态Fe-Mn-Al系奥氏体钢的组织和性能进行了研究。结果表明,经水韧处理后,组织仍为奥氏体,但晶粒明显变粗,从而导致屈服强度和抗拉强度明显下降,塑性和韧性得到改善,原因在于原始奥氏体基体内和沿晶界分布的碳化物均溶入奥氏体,以及孪晶的生成。热轧态与热处理态相对磁导率保持一致,均小于1.2,奥氏体是影响相对磁导率的关键因素。
The microstructure and properties of hot-rolled and water-toughened Fe-Mn-Al-based austenitic steels were investigated by optical microscopy, mechanical and magnetic properties testing equipment. The results show that the microstructure is still austenite after the hydration treatment, but the grains are obviously thicker, which leads to the obvious decrease of yield strength and tensile strength and the improvement of ductility and toughness. The reason is that the microstructure of the original austenite matrix The grain boundary distribution of carbides are dissolved into austenite, as well as twin formation. The relative permeability of the hot-rolled state and the heat-treated state remained the same, all less than 1.2. Austenite was the key factor affecting the relative permeability.