Effect of tempering temperature on microstructure and properties ofCr5NiMoVNb steel for backup roll

doi:10.13251/j.issn.0254-6051.2021.02.023

Abstract

Abstract: Effect of tempering temperature on microstructure and mechanical properties of Cr5NiMoVNb steel for backup roll was studied by means of scanning electron microscope, X-ray diffractometer, Rockwell hardness tester, tensile tester and impact tester. The results show that tempered martensite-predominantly matrix is observed in Cr5NiMoVNbb steel with a small amount of residual austenite when temped at different temperatures. The precipitation of carbides and the phase transition of residual austenite occur during tempering process. The strength (tensile strength and yield strength) and the hardness of Cr5NiMoVNb steel gradually decrease with the increase of tempering temperature. The plasticity (reduction of area) and the toughness (impact absorbed energy) of the Cr5NiMoVNb steel gradually increase with the increase of tempering temperature. When tempering temperature is 520 ℃, the preferable mechanical properties of Cr5NiMoVNb steel are obtained, leading the hardness, tensile strength, reduction of area and impact absorbed energy to 53.5 HRC, 1735 MPa, 25.2% and 7.3 J, respectively.

Key words: backup roll, tempering temperature, microstructure, retained austenite, mechanical properties

CLC Number:

TG142. 3

Li Yanlong, Wu Qiong, Liu Changsheng. Effect of tempering temperature on microstructure and properties ofCr5NiMoVNb steel for backup roll[J]. Heat Treatment of Metals, 2021, 46(2): 136-139.

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