Effect of forging and heat treatment on microstructure and wear resistance of wear-resistant steel

doi:10.13251/j.issn.0254-6051.2022.07.025

Abstract

Abstract: Effect of forging deformation and heat treatment process on microstructure, hardness and wear resistance of a new wear-resistant steel was studied, and the content of martensite+retained austenite in the steel was quantitatively analyzed by color metallography method. The results show that the wear-resistant steel microstructure under different deformations are all bainite/martensite multiphase, and the thickness of the bainitic lath is reduced from 524 nm to 292 nm as the deformation increases from 30% to 70%, while the volume fraction of martensite +retained austenite increases from 25.4% to 41.1%. After holding at 330 ℃(above the Ms) for 5 min and then 260 ℃ isothermal transformation, and compared with that of direct 260 ℃ isothermal transformation without 330 ℃ holding, the thickness of bainite lath decreases by 357.2 nm, the wear loss decreases by 0.02 g, and the average friction factor decreases from 0.311 to 0.212.

Key words: forging, heat treatment process, wear resistance, bainite/martensite multiphase

CLC Number:

TG156.1

Zhang Heng, Zhang Di, Liu Xinyu, Wang Xiaodong, Gao Zhanyong, Chen Lin. Effect of forging and heat treatment on microstructure and wear resistance of wear-resistant steel[J]. Heat Treatment of Metals, 2022, 47(7): 138-143.

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