淬火配分处理对锻态Fe-0.2C-9Mn-3.5Al钢显微组织及力学行为的影响  

Influence of quenching and partitioning treatment on microstructure and mechanical behaviors of forged Fe-0.2C-9Mn-3.5Al steel

作　　者：李金鑫 黄兴民[1] 张雷[1] 吕超 戴光泽[1] Li Jinxin;Huang Xingmin;Zhang Lei;Lü Chao;Dai Guangze(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《金属热处理》2020年第2期87-93,共7页Heat Treatment of Metals

摘　　要：分析了淬火配分处理对锻态Fe-0. 2C-9Mn-3.5Al钢显微组织及力学行为的影响。结果表明,热处理态试验钢主要由块状δ-铁素体、马氏体和板条状残留奥氏体等多相构成;残留奥氏体的体积分数随等温淬火温度升高而增大,在310℃时达到峰值;310℃等温淬火后在400℃配分3 min时可以获得较优的综合力学性能,抗拉强度和断后伸长率分别为1175 MPa和21. 50%,强塑积达到25. 26 GPa·%;应力-应变曲线中存在着明显的"锯齿"状起伏,可能与亚稳态的残留奥氏体集中转变为马氏体有关。Influence of quenching and partitioning treatment on the microstructure and mechanical behaviors of forged Fe-0. 2 C-9 Mn-3. 5 Al steel was analyzed. The results show that the multiphase microstructure of the heat-treated steel mainly consists of granular δ-ferrite,martensite and lath retained austenite. With the increase of isothermal quenching temperature,the volume fraction of retained austenite increases and reaches the maximum at 310 ℃.When partitioning at 400 ℃ for 3 min after quenching at 310 ℃,preferable comprehensive mechanical properties can be obtained. The tensile strength and elongation reach 1175 MPa and 21. 50% respectively,and the product of strength and elongation reaches 25. 26 GPa·%.In addition,there are obvious serration fluctuations in the corresponding engineering stressstrain curves,which may be related to the concentrated transformation of the metastable retained austenite to martensite.

关 键 词：锻态Fe-0.2C-9Mn-3.5Al钢 淬火配分 残留奥氏体 显微组织 力学行为 

分 类 号：TG142[一般工业技术—材料科学与工程]