Effect of heat treatment on microstructure and mechanical properties of working layer of centrifugally composite casting backup roll

doi:10.13251/j.issn.0254-6051.2025.04.038

Abstract

Abstract: Effect of quenching and tempering processes on microstructure and mechanical properties of the working layer of vertically centrifugally composite casting backup roll, via heat treatment tests of specimens from working layer of the backup roll, was studied, and microstructure observations and mechanical property tests were carried out. The results show that the microstructure of the working layer of the backup roll after final quenching and tempering treatment is composed of tempered martensite, bainite, retained austenite and carbide particles with a dispersed distribution, and the carbide particles are fine and uniformly distributed. Through comparative is analysis, it is found that the optimal quenching and tempering temperatures of the centrifugally composite backup roll are 1000 ℃ and 500 ℃, respectively. The hardness of the working layer reaches 63.9 HRC, the tensile strength reaches 549 MPa. The tensile fracture shows a quasi-cleavage morphology and there are typical lamellar structures. The impact fracture shows typical intergranular cracking characteristics, the cleavage plane of the fracture is refined, and the carbide particles are fine and uniformly distributed.

Key words: backup roll, working layer, heat treatment, microstructure, mechanical properties

CLC Number:

TG255

Zhu Jian, Shao Lijun, Fang Ping, Chu Enjie. Effect of heat treatment on microstructure and mechanical properties of working layer of centrifugally composite casting backup roll[J]. Heat Treatment of Metals, 2025, 50(4): 246-251.

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