热处理对离心复合铸造支承辊工作层组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.04.038

摘要/Abstract

摘要： 为研究淬回火工艺对立式离心复合铸造支承辊工作层组织与力学性能的影响,在支承辊的工作层上取样进行热处理试验,并进行显微组织观察和力学性能试验。结果表明,最终调质处理后支承辊工作层的组织为回火马氏体+贝氏体+残留奥氏体+碳化物颗粒,碳化物颗粒细小均匀弥散分布;通过对比分析发现,离心复合支承辊最佳的淬火和回火温度分别为1000 ℃和500 ℃,工作层硬度达63.9 HRC、抗拉强度达549 MPa,拉伸断口呈准解理形貌并存在典型的片状组织,冲击断口呈现典型的沿晶开裂特征,断口解理面细化,碳化物颗粒细小均匀分布。

关键词: 支承辊, 工作层, 热处理, 显微组织, 力学性能

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

中图分类号:

TG255

朱健, 邵黎军, 方平, 储恩杰. 热处理对离心复合铸造支承辊工作层组织和力学性能的影响[J]. 金属热处理, 2025, 50(4): 246-251.

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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