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The Gradient Microstructure and High-Temperature Wear Behavior of the CoCrMoSi Coating by Laser Cladding

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Abstract

Recently, laser cladding has been widely investigated for the preparation of Co-based coatings for high-temperature applications. However, there is a highly cracking tendency in Co-based alloys due to the reinforcing hard phases. In this work, a single layer of CoCrMoSi coating was prepared with laser cladding on 304 stainless steel. By proper preheating, cracking was avoided during deposition. The high-temperature wear behaviors of the coating were evaluated by ball-on-disk test. In terms of morphology and chemical composition, the coating exhibited a gradient microstructure across the section. From the interface with the substrate to the top surface, the structure was characterized with three types of morphology in sequence, i.e., coarse cellular crystals in the interdiffusion zone, nanosized lamellar eutectic and Laves-phase dendrites embedded within nanosized lamellar eutectic. The surface hardness of the coating is 835HV0.3, which was mainly attributed to the Laves phase. Compared with the 304 stainless steel, the volume loss of the coating decreased by 76.5%at 400°C. The wear mechanisms of the coating were oxidation wear and abrasive wear. The excellent coating wear resistance at high-temperature can be traced to the microstructure of Laves phase embedded within the nanosized eutectic.

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Acknowledgment

Financial support from National Key Research and Development Program of China (Grant No. 2016YFB1100200), Natural Science Foundation of China (Grant No. 51501120), Suzhou Science and Technology Program (SGC201720) is acknowledged. The authors thank Mr. Zongyuan Liu, Mr. Chuanbing Zou for assistance in sample preparation.

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Authors and Affiliations

  1. Suzhou Nuclear Power Research Institute, Suzhou, 15004, China

    Haifeng Lu, Enwei Qin, Chengwei Liu & Shuhui Wu

  2. School of Mechanical and Electric Engineering, Soochow University, Suzhou, 215123, China

    Wenli Li

  3. Daya Bay Nuclear Power Operations and Management Co., Ltd, Shenzhou, 518124, China

    Shengyong Liu & Wenli Zhang

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  1. Haifeng Lu
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  2. Wenli Li
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Correspondence to Wenli Li.

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This article is an invited paper selected from presentations at the 10th Asian Thermal Spray Conference (ATSC 2020) and has been expanded from the original presentation. ATSC 2020 was held in Ningbo, China, from November 1-3, 2020 and was organized by the Asian Thermal Spray Society with Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences as the Host Organizer.

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Lu, H., Li, W., Qin, E. et al. The Gradient Microstructure and High-Temperature Wear Behavior of the CoCrMoSi Coating by Laser Cladding. J Therm Spray Tech 30, 968–976 (2021). https://doi.org/10.1007/s11666-021-01184-0

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