Effect of quenching temperature on microstructure and mechanical properties of high Ti low alloy wear-resistant steel

doi:10.13251/j.issn.0254-6051.2022.04.019

Abstract

Abstract: Effect of quenching temperature on microstructure, precipitated phase and hardness of a high Ti low alloy wear-resistant steel was investigated, and the reasons of the change of microstructure and mechanical properties were analyzed. The results show that the microstructure after quenching and tempering is lath martensite with high dislocation density; the size of precipitated phase is mainly divided into micron-, submicron-, and nano-scales, in which the micron-sized precipitates are rod-shaped, and the sub-micron and nano-sized precipitates are spherical; fine (Ti, Mo)C precipitates are distributed on the martensite laths. As the quenching temperature increases, the yield strength, tensile strength and hardness of the steel first increases and then decreases, and reaching the maximum values of 1248 MPa, 1535 MPa and 434 HV respectively when the quenching temperature is 920 ℃, meanwhile, the elongation reaches 10%. With the increase of the quenching temperature, the nano-scale precipitates gradually dissolves and decreases in content but the size gradually increases; and the sizes of the prior austenite grain and the martensitic lath are slightly increased by flattening along the rolling direction, while the width of martensite laths does not increase significantly. The dispersed (Ti, Mo)C precipitates of 5-10 nm in large quantity are the main factor for promoting the hardness increase of the wear-resistant steel. As the quenching temperature increases, the coarsening of both the fine (Ti, Mo)C phase and the prior austenite grain are not conducive to the improvement of the hardness of the wear-resistant steel.

Key words: low alloy wear-resistant steel, quenching temperature, martensite, microstructure, hardness

CLC Number:

TG142.1

Fu Xibin, Chen Zihao, Zhang Ke, Zhao Shiyu, Sun Xinjun, Zhu Zhenghai, Liang Xiaokai, Yong Qilong. Effect of quenching temperature on microstructure and mechanical properties of high Ti low alloy wear-resistant steel[J]. Heat Treatment of Metals, 2022, 47(4): 122-127.

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