Structure and Abrasive Wear Resistance of Stainless-Steel Surface Layers Alloyed with Boron

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL Journal of Friction and Wear Pub Date : 2024-03-09 DOI:10.3103/S1068366623060041
E. G. Bushueva, E. A. Drobyaz, M. G. Golkovsky, V. A. Bataev, E. V. Domarov, A. A. Dudareva
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Abstract

The structure, microhardness, and tribological properties of coatings obtained in the process of surfacing of powder mixtures by an electron beam ejected into an air atmosphere are studied. For surfacing, we used a powder mixture containing amorphous boron and a wetting component, the role of which was played by Fe, Cr and Ni powder particles. The function of protecting the molten material from the air atmosphere was performed by MgF2 flux. The thickness of the formed coatings reached 2.3–2.8 mm. The maximum level of microhardness of coatings reaches ~1500 HV. The main mechanism of hardening of such is due to the presence in the material of up to 90% (volume) particles of the hardening phase. It is shown that chromium borides Cr2B and (Fe,Cr)2B play the role of a hardening phase in the γ-phase (Ni, Fe solid solution). Chromium is contained in the alloying powder mixture and the base material. During the cladding process, chromium diffuses and forms borides. This process occurs due to the greater affinity of chromium for boron than nickel and iron. It has been established that chromium containing coatings have maximum wear resistance under various abrasive conditions. The wear resistance of coatings increased by 5 times compared to stainless steel 12Х18Н9T under friction with fixed abrasive particles. The wear resistance of hardened layers under conditions of gas and hydroabrasive action at low angles of attack (15°, 20°) increased by 6 and 2 times, respectively.

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硼合金化不锈钢表层的结构和耐磨性
摘要 研究了在空气环境中用电子束喷射粉末混合物堆焊过程中获得的涂层的结构、显微硬度和摩擦学特性。在堆焊过程中,我们使用了一种含有无定形硼和润湿成分的粉末混合物,其中铁、铬和镍粉颗粒起到了润湿成分的作用。MgF2 助熔剂起到了保护熔融材料不受空气影响的作用。形成的涂层厚度达到 2.3-2.8 毫米。涂层的显微硬度最高可达 ~1500 HV。这种硬化的主要机制是由于材料中存在高达 90%(体积)的硬化相颗粒。研究表明,铬硼化物 Cr2B 和 (Fe,Cr)2B 在 γ 相(镍、铁固溶体)中起着硬化相的作用。合金粉末混合物和基体材料中都含有铬。在堆焊过程中,铬扩散并形成硼化物。出现这一过程的原因是铬与硼的亲和力比与镍和铁的亲和力大。已经证实,含铬涂层在各种磨料条件下具有最大的耐磨性。与不锈钢 12Х18Н9T 相比,涂层在固定磨粒摩擦下的耐磨性提高了 5 倍。在低攻角(15°、20°)的气体和水磨作用条件下,硬化层的耐磨性分别提高了 6 倍和 2 倍。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
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.
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