Microstructure, oxidation resistance and mechanical properties of stellite 12 composite coating doped with submicron TiC/B4C by laser cladding

SURFACE & COATINGS TECHNOLOGY

卷:395

Article

Cheng, Qiran^1,2  Shi, Haichuan^1,2  Zhang, Peilei^1,2  Yu, Zhishui^1,2  Wu, Di^1,2  He, Shanshan^1,2  Tian, Yingtao³ 

[1] Shanghai Univ Engn Sci, Sch Mat Engn, Room 3109,333 Long Teng Rd,Songjiang Campus, Shanghai 201620, Peoples R China

[2] Shanghai Collaborat Innovat Ctr Laser Adv Mfg Tec, Shanghai 201620, Peoples R China

[3] Univ Lancaster, Dept Engn, Lancaster LA1 4YW, England

关键词: Laser cladding;    Stellite composite coating;    Sub-micron Ti/B4C;    Microstructure;    Wear;    Oxidation;   

DOI  :  10.1016/j.surfcoat.2020.125810

来源: Elsevier

【 摘 要 】

Stellite 12 and Ti/B4C composite coatings were successfully fabricated on the surface of 304 stainless steel substrates by laser cladding. The effect of Ti/B4C with different mass fractions on the structure and properties of Stellite 12 coating were studied. The properties and the growth mode of the coating were analyzed. The results show that the Stellite 12 coating was mainly composed of face-centered cubic gamma-Co and Cr7C3. With the addition of Ti/B4C, TiC submicron particle phase was synthesized in situ in the coatings. Residual B4C as a heterogeneous nucleus particle, forming a submicron microstructure TiC/B4C strengthening phase, and the particle size gradually decreases. The TiC/B4C particles can refine the grains of the coatings. The micro-hardness of the coating gradually increased with the increase of Ti/B4C, and the highest were 650 HV. The wear resistance and oxidation resistance of the coatings gradually increased with the increase of Ti/B4C.

【 授权许可】

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