Structure analysis of laser remelted coating and its influential factors

Yunxin Wu; Yunming Zhu; Zhangxiao Zhu; Lianzhen Ding

doi:10.1117/12.144173

11 May 1993 Structure analysis of laser remelted coating and its influential factors

Yunxin Wu, Yunming Zhu, Zhangxiao Zhu, Lianzhen Ding

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144173
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

Abstract

In order to enhance the fretting resistance of austenitic stainless steel, a 2 kW cw CO₂ laser was used to remelt the flame sprayed Ni-Cr-B-Si coating on a substrate of 1Cr18Ni9Ti. The laser remelted coating showed excellent fretting resistance for over 500 hrs in our previous vibration test. In this paper, the microstructures and chemical compositions of the coating were studied by means of x-ray diffraction (XRD) and scanning electron microscope (SEM) analysis. The results show that the homogeneous and dense coating includes two main microconstituents: hard precipitate CrB of Hv1100 - 1400 and tough solid solution of Hv590. The formation of these microstructures and the effect of laser power density on it also were discussed. It is proven that the precipitation of hard phases and the forms of solid solution are greatly related to the input power density and the cooling rate after laser remelting.

Citation Download Citation

Yunxin Wu, Yunming Zhu, Zhangxiao Zhu, and Lianzhen Ding "Structure analysis of laser remelted coating and its influential factors", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144173

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