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

doi:10.13251/j.issn.0254-6051.2020.02.017

Abstract

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

CLC Number:

TG142

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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