Effect of quenching temperature on microstructure and properties of 5Cr15MoV steel by air-cooling quenching

doi:10.13251/j.issn.0254-6051.2022.08.035

Abstract

Abstract: Air cooling quenching experiment was performed on 5Cr15MoV martensitic stainless steel at a series of heating temperatures ranging from 1000 ℃ to 1200 ℃ at an interval of 50 ℃. The test of microstructure and hardness were performed by means of optical microscope, EBSD and Rockwell hardness tester after quenching at different temperatures. The effect of quenching temperature on microstructure, grain size, retained austenite content and hardness of the tested steel was studied. The results show that the quenched steel consists of martensite, undissolved carbide and retained austenite. With the increase of quenching temperature, the size of martensitic lath increases, the amount of undissolved carbide decreases gradually until it disappears, and the content of retained austenite increases first and then decreases. The hardness of the tested steel increases first and then decreases significantly, and reaches the maximum of 60.8 HRC at 1050 ℃. The hardness of the tested steel is mainly the result of comprehensive effect of carbon content of martensite, grain size, retained austenite content and carbide content.

Key words: 5Cr15MoV steel, air-cooling quenching, quenching temperature, microstructure, hardness

CLC Number:

TG156

Tian Chunying, Dong Ji, Wang Jun, Zhang Huixing, Feng Tianjian, Liu Xiaofan. Effect of quenching temperature on microstructure and properties of 5Cr15MoV steel by air-cooling quenching[J]. Heat Treatment of Metals, 2022, 47(8): 211-216.

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