Influence of Tempering Temperature on the Microstructure and Mechanical Properties of 2%Mn High Strength Steel
FAN Lifeng1,2, YANG Yulong1, YUE Erbin3, GUO Hongfei1,*, HUANG Jiao1, GAO Jun4
1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 Engineering Research Center of Rare Earth Metals, Inner Mongolia University of Technology, Hohhot 010051, China 3 Zhejiang Metallurgical Research Institute Co., Ltd., Hangzhou 310007,China 4 Manufacturing Dept. of Inner Mongolia Baotou Steel Union Co.,Ltd., Baotou 014010, Inner Mongolia, China
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·%.
樊立峰, 杨玉龙, 岳尔斌, 郭洪飞, 黄娇, 高军. 回火温度对2%Mn高强钢组织和性能的影响[J]. 材料导报, 2024, 38(15): 23080090-7.
FAN Lifeng, YANG Yulong, YUE Erbin, GUO Hongfei, HUANG Jiao, GAO Jun. Influence of Tempering Temperature on the Microstructure and Mechanical Properties of 2%Mn High Strength Steel. Materials Reports, 2024, 38(15): 23080090-7.
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2024, Vol. 38 
