Tempered microstructure and properties of on-line quenched micro alloyed high strength steel

doi:10.13251/j.issn.0254-6051.2020.11.035

Abstract

Abstract: To investigate the effect of tempering temperature on microstructure and mechanical properties of the tested steel, the process of tempering at 400-600 ℃ for 40 min for micro alloyed high strength steel was carried out. The microstructure was analyzed by means of optical microscope and scanning electron microscope. At the same time, the strength, hardness and impact absorbed energy at -40 ℃ after tempering were measured to analyze the mechanical properties. The results show that with the increase of tempering temperature, the strength and hardness of the tested steel are reduced on the whole, and the impact absorbed energy shows a mainly increasing tendency. But the tempering brittleness appears at 450-500 ℃. The martensite in the tested steel gradually broadens and decreases with the increase of tempering temperature, and the ferrite content increases. When tempered at 450 ℃, the microstructure of the tested steel is troostite, the yield strength and hardness of the tested steel are 840 MPa and 304 HV3, the elongation after fracture is 14.4%, and the impact absorbed energy at -40 ℃ is 129 J, which indicates good comprehensive mechanical properties.

Key words: micro alloyed high strength steel, tempering treatment, microstructure, mechanical properties

CLC Number:

Xu Wenfang, Zhang Pengyan, Yang Peng. Tempered microstructure and properties of on-line quenched micro alloyed high strength steel[J]. Heat Treatment of Metals, 2020, 45(11): 187-191.

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