锻压技术

退火温度对冷轧态Fe-10Mn-4Al-0.4C中锰钢组织及力学性能的影响

英文标题：Influence of annealing temperature on microstructure and mechanical properties of cold-rolled Fe-10Mn-4Al-0.4C medium manganese steel

作者：贾凯麟杨明维苏宏东冯运莉

单位：华北理工大学冶金与能源学院

关键词：中锰钢冷轧态退火温度组织力学性能

分类号：TG142.1

出版年,卷(期):页码：2025,50(8):258-267

摘要：

利用SEM、EBSD和电子万能拉伸试验机等研究了退火温度对冷轧态Fe-10Mn-4Al-0.4C中锰钢组织与力学性能的影响。冷轧态下室温组织主要由条带状的δ-铁素体、马氏体、细小块状的α-铁素体和奥氏体构成，退火态下室温组织由条带状的δ-铁素体、块状的α-铁素体和奥氏体构成。退火过程中，马氏体经逆相变消失，随着退火温度的升高，α-铁素体与奥氏体晶粒长大，奥氏体含量由60.9%增加至78.0%，铁素体含量由39.1%降低至22.0%，抗拉强度和断后伸长率先降低再升高，而屈服强度逐渐降低。750 ℃退火时，铁素体与奥氏体晶粒尺寸均匀且最为细小，产生了细晶强化，此时屈服强度为830.8 MPa、抗拉强度为986.1 MPa、断后伸长率为40.8%、强塑积达40.23 GPa·%，具有较好的综合力学性能。

The influence of annealing temperature on microstructure and mechanical properties of cold-rolled medium manganese steel Fe-10Mn-4Al-0.4C was investigated by SEM, EBSD and electronic universal tensile testing machine. The results show that the room temperature microstructure in the cold-rolled state is mainly composed of banded δ-ferrite, martensite, fine blocky α-ferrite and austenite, and the room temperature microstructure in the annealed state is composed of banded δ-ferrite, blocky α-ferrite and austenite. During the annealing process, martensite disappears through the reverse phase transformation. With the increasing of annealing temperature, α-ferrite and austenite grains grow, the austenite content increases from 60.9% to 78.0%, and the ferrite content decreases from 39.1% to 22.0%. The tensile strength and elongation after fracture first decrease and then increase, and the yield strength gradually decreases. When annealed at 750 ℃, the grain sizes of ferrite and austenite are uniform and the smallest, resulting in fine grain strengthening, the yield strength is 830.8 MPa, the tensile strength is 986.1 MPa, the elongation after fracture is 40.8% and the strength-plasticity product is 40.23 GPa·%, which exhibits good comprehensive mechanical properties.

基金项目：

国家自然科学基金资助项目（51974134）；河北省创新能力提升计划项目（24461002D）

作者简介：贾凯麟(1996-)，男，硕士研究生 E-mail：970274625@qq.com 通信作者：冯运莉(1965-)，女，博士，教授 E-mail：tsfengyl@163.com

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