Phase interaction induced texture in a plasma sprayed-remelted NiCrBSi coating during solidification: An electron backscatter diffraction study

SURFACE & COATINGS TECHNOLOGY

卷:358

Article

Chen, Liang-Yu^1,2,3  Xu, Tianxiang¹  Wang, Haiyang¹  Sang, Peng³  Lu, Sheng¹  Wang, Ze-Xin¹  Chen, Shujin¹  Zhang, Lai-Chang² 

[1] Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Jiangsu, Peoples R China

[2] Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia

[3] Jiangsu Univ Sci & Technol, Sch Sci, Zhenjiang 212003, Jiangsu, Peoples R China

关键词: NiCrBSi;    Coating;    Spraying;    Solidification;    Texture;    Phase interaction;   

DOI  :  10.1016/j.surfcoat.2018.11.019

来源: Elsevier

【 摘 要 】

Although considerable endeavors have been dedicated to investigate the microstructures of the remelting-enhanced NiCrBSi coatings, the textures in the remelted coatings, which may result in property anisotropy, are rarely studied. In this work, the recrystallized fractions, grain orientations and interphase boundaries for Ni, Ni3B and CrB in a plasma sprayed-remelted NiCrBSi coating were investigated by electron backscatter diffraction. The results demonstrate that the texture is induced by phase interaction during solidification. Cooling from the liquid, the firstly formed Ni grains possess a cube fiber texture of {001}<001>. The successively formed Ni3B colonies are randomly oriented and keep specific orientation relationships with the surrounding Ni grains, resulting in formation of some weak texture components of Ni. The finally formed CrB grains have a considerably high frequency (40.8%) of lattice correlation boundary of (002)(Ni)//(040)(CrB), but no specific orientation relationships with Ni3B grains. Hence, the interaction of Ni and CrB grains leads to the formation of more texture components of Ni. As such, the phase interaction induced texture forms in the remelted NiCrBSi coating. This work would give an insight into the anisotropy in the remelted NiCrBSi coatings and provide a theoretical basis of further optimizing the remelting process technologies.

【 授权许可】

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