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

doi:10.13251/j.issn.0254-6051.2020.02.017

摘要/Abstract

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。

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

Abstract:

Influence of quenching and partitioning treatment on the microstructure and mechanical behaviors of forged Fe-0.2C-9Mn-3.5Al 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 stress-strain curves, which may be related to the concentrated transformation of the metastable retained austenite to martensite.

Key words: forged Fe-0.2C-9Mn-3.5Al steel, quenching and partitioning, retained austenite, microstructure, mechanical behaviors

中图分类号:

TG142

李金鑫, 黄兴民, 张雷, 吕超, 戴光泽. 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[J]. 金属热处理, 2020, 45(2): 87-93.

Li Jinxin, Huang Xingmin, Zhang Lei, Lü Chao, Dai Guangze. Influence of quenching and partitioning treatment on microstructure and mechanical behaviors of forged Fe-0.2C-9Mn-3.5Al steel[J]. HTM, 2020, 45(2): 87-93.

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