Effect of Si content on microstructure and properties of high carbon bainitic steel

doi:10.13251/j.issn.0254-6051.2023.09.028

Abstract

Abstract: Four kinds of high carbon bainitic bearing steels with different Si contents were designed. Under the same heat treatment condition, the effect of Si content on phase transformation, microstructure characteristics and mechanical properties of the high carbon bainitic bearing steels was studied by means of thermal expansion phase change meter, X-ray diffractometer, scanning electron microscope, transmission electron microscope techniques. The results show that Si can prolong the bainite transformation incubation period, decreases the bainite transformation rate and increase the phase transformation points of Ac₁, Ac_cm of the high carbon bainitic bearing steels. With the increase of Si content in the high carbon bainitic bearing steels, the volume fraction of retained austenite of the high carbon bainitic bearing steels increases, but the size of bainitic ferrite lath decreases. When the Si content reaches 1.4%, the size of bainite ferrite lath reaches nanometer level and no carbides precipitates in it. The results of mechanical properties show that the hardness of the steels decreases with the increase of Si content, and the toughness increases with the increase of Si content. The steel with the Si content of 1.4% has the best comprehensive mechanical properties.

Key words: Si, high carbon bainitic steel, microstructure, hardness, impact absorbed energy

CLC Number:

TG142

Dai Zhao, Guo Zhi, Long Xiaoyan, Feng Xiaoyong, Liu Wei, Zhang Fucheng, Li Yanguo. Effect of Si content on microstructure and properties of high carbon bainitic steel[J]. Heat Treatment of Metals, 2023, 48(9): 165-173.

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