Effect of isothermal time on microstructure and properties of low carbon micro-alloyed steel

doi:10.13251/j.issn.0254-6051.2023.11.034

Abstract

Abstract: Effect of different isothermal time on microstructure and properties of a low carbon micro-alloyed steel (0.058%C) was studied by means of metallographic microscope, field emission scanning electron microscope, transmission electron microscope, tensile testing and X-ray diffractometer. The results show that when the isothermal time increases from 1800 s to 86 400 s at 725 ℃, the volume fraction of lath bainite decreases while the volume fraction of ferrite increases. Almost all the retained austenite in the specimen under isothermal time of 86 400 s decomposes. The tensile strength of the tested steel decreases with the prolongation of isothermal time, the yield strength decreases, while the elongation after fracture increases. When the isothermal time is 1800 s, the lower bainite structure with good match of strength and toughness can be obtained.

Key words: low carbon micro-alloyed steel, isothermal time, microstructure, mechanical properties

CLC Number:

TG151.2

Sun Tingting, Liu Pengcheng, Wu Zhongwang, Tian Fangcheng, Xing Lei. Effect of isothermal time on microstructure and properties of low carbon micro-alloyed steel[J]. Heat Treatment of Metals, 2023, 48(11): 216-220.

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