The Influence of the Cooling Mode during High-Speed Thermal Spraying of Coatings Made of 95Cr18 Steel on Their Structure and Wear Resistance

IF 0.5 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Friction and Wear Pub Date : 2025-02-25 DOI:10.3103/S1068366624700399

V. A. Kukareko, M. A. Belotserkovsky, A. N. Grigorchik, Guo Xiaomei

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Abstract

A study was carried out on the influence of the cooling rate of gas-thermal coatings made of high-chromium 95Cr18 steel on their phase composition and tribotechnical properties. It has been established that preheating the steel substrate to 400°C before spraying the coating leads to a 2.7-fold decrease in its cooling rate in the region of bainite transformation and an increase in the content of retained austenite in the coating to 83.5 vol %. It is shown that the stabilization of austenite is due to the redistribution of carbon between the α- and γ-phases and the enrichment of austenite with carbon. It has been established that a coating made of 95Cr18 steel, sprayed onto a substrate heated to 400°C, is characterized by higher wear resistance under various friction conditions (by 12–24%) compared to a coating formed on a cold substrate. High wear resistance of coatings with a high content of the γ-phase is achieved due to the deformation-activated γ → α transformation, leading to a significant increase in microhardness and wear resistance of the surface layers of coatings.

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95Cr18钢高速热喷涂涂层冷却方式对涂层组织和耐磨性的影响

研究了冷却速度对高铬95Cr18钢气热涂层相组成和摩擦性能的影响。结果表明，在喷涂涂层前将钢基体预热至400℃，使基体在贝氏体转变区域的冷却速率降低2.7倍，使涂层中残余奥氏体的含量增加到83.5 vol %。结果表明，奥氏体的稳定是由于碳在α-相和γ-相之间的再分配和碳在奥氏体中的富集。研究表明，将95Cr18钢涂层喷涂到加热至400℃的基体上，与在冷基体上形成的涂层相比，在各种摩擦条件下具有更高的耐磨性（提高12-24%）。变形激活的γ→α相变使高γ相含量的涂层具有较高的耐磨性，使涂层表层的显微硬度和耐磨性显著提高。

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来源期刊

Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.