Effect of Si on microstructure and mechanical properties of low temperature bainitic steel with medium carbon

doi:10.13251/j.issn.0254-6051.2020.09.037

Abstract

Abstract: In order to investigate the effect of Si on the microstructure and mechanical properties of bainitic steels,low temperature bainite treatment process was carried out for medium carbon steels with Si content of 0.3wt% and 1.5wt%,respectively.The results show that the microstructure of the steels with different contents of Si are significantly different,the microstructure of the specimen containing 0.3%Si is mainly composed of bainitic ferrite,M/A island and a large amount of cementite,and the microstructure of the specimen containing 1.5% Si is mainly composed of bainitic ferrite and M/A island.The hardness and impact properties of the specimen containing 1.5%Si are higher than that of the specimen containing 0.3%Si.The higher hardness is mainly due to the solid solution strengthening and fine grain strengthening.The main reason for the higher impact properties is that the addition of proper amount of Si can inhibit the precipitation of cementite,thus increasing the volume fraction of retained austenite and its carbon content,thus producing a relatively significant TRIP effect.

Key words: Si, microstructure, low temperature bainite, retained austenite, mechanical properties

CLC Number:

TG142.12

Zheng Hua, Hu Feng, Ke Rui, Wu Kaiming. Effect of Si on microstructure and mechanical properties of low temperature bainitic steel with medium carbon[J]. Heat Treatment of Metals, 2020, 45(9): 203-209.

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