回火温度对2%Mn高强钢组织和性能的影响

doi:10.11896/cldb.23080090

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Abstract Development direction of advanced high-strength steel is high strength and high plasticity. In this work, the 2%Mn steel as the research subject, and the best matching of high strength and high plasticity was achieved by controlling the tempering temperature, the SEM, TEM and XRD were used to analyze the influence mechanism of microstructure and mechanical properties. the results show that: The steel was organized as ferrite, pearlite, low carbon martensite and residual austenite after isothermal annealing in the pearllet region; the residual austenite volume fraction continuously decreased from 6.78% of the annealed state to 2.55% of the 425 ℃ tempering state, then the residual austenite volume fraction was basically unchanged and maintained at a stable level as the tempering temperature increases further; with the increase of tempering temperature, ferrite content continues to increase, dislocation density, tensile strength, yield strength and hardness continuous to decrease, and extension increases first then decreasing; after 425 ℃ tempering, the average batten width of ferrite was 95.1 nm, dislocation density was 2.6×10¹⁴ m^-2, average diameter of carbide was 13.9 nm, tensile strength was 1 770 MPa, yield strength was 1 450 MPa, elongation was 9.84%, and the strong plastic product reached maximum of 17.4 GPa·%.

Key words： 2%Mn high strength steel tempering retained austenite mechanical property

Published: 10 August 2024 Online: 2024-08-29

CLC number:

TG142.71

Fund:National Natural Science Foundation of China (52361025), Inner Mongolia Science and Technology Project (2022ZY0001,2022YFHH0079), Scientific and Technical Young Talents of the Inner Mongolia Autonomous Region (NJYT23116,JY20240063).

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	Articles by authors
	FAN Lifeng
	YANG Yulong
	YUE Erbin
	GUO Hongfei
	HUANG Jiao
	GAO Jun

Cite this article:

FAN Lifeng,YANG Yulong,YUE Erbin, et al. Influence of Tempering Temperature on the Microstructure and Mechanical Properties of 2%Mn High Strength Steel[J]. Materials Reports, 2024, 38(15): 23080090-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23080090 OR http://www.mater-rep.com/EN/Y2024/V38/I15/23080090

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