Microstructure and Wear Resistance of TIG Remelted NiCrBSi Thick Coatings. (21st March 2018)

• Record Type: Journal Article
• Authors: Li, Guo-lu; Li, Ya-long; Dong, Tian-shun; Wang, Hai-dou; Zheng, Xiao-dong; Zhou, Xiu-kai
• Other Names: Yin Shuo Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2018(2018)
• Publication Date: 2018-03-21
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2018/8979678
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : The self-fluxing NiCrBSi coatings with 800 μ m thickness were prepared on the surface of AISI1045 steel substrate by plasma spraying. And the remelted coating was obtained using by the tungsten inert gas (TIG) arc process. The microstructure, surface roughness, hardness, phase composition, and wear resistance of the sprayed coating and remelted coating were systematically investigated. The results demonstrate that TIG remelted treatment can significantly eliminate the microscopic defects in thick coating and improve its density. The surface roughness (Ra) of the remelted coating is only 18.9% of the sprayed coating. The hardness of the remelted coating is 26.8% higher than that of the sprayed coating. The main phases in the sprayed coating are changed from γ-Ni, Cr7 C3, and Cr2 B to γ-Ni, Cr23 C6, CrB, Ni3 B, and Fe3 C. The wear mass loss of the remelted coating is only 17.1% of the sprayed coating. Therefore, a Ni-based thick coating with good wear resistance can be obtained by plasma spraying and remelted technique.