Microstructure and properties of laser clad Stellite12 alloy layer on S31000 stainless steel

doi:10.13251/j.issn.0254-6051.2023.02.045

Abstract

Abstract: Aiming at the problems that high-temperature valve sealing pair was easier to be scratched and bruised, Stellite12 alloy layer was prepared on the surface of S31000 stainless steel sealing pair by laser cladding technology. The microstructure, microhardness and uniform corrosion property of the clad layer were studied by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction, microhardness tester and uniform corrosion full immersion test. The results show that the clad layer forms a good metallurgical bond with the substrate, and the microstructure is mainly composed of dendrite structures of planar crystal, columnar crystal and equiaxed crystal. The microhardness of the clad layer is relatively high, with the average microhardness of 600.68 HV0.3, while the microhardness of the substrate is the lowest, with the average microhardness of 204.57 HV0.3. Compared with that of the S31000 stainless steel substrate, the corrosion rate is significantly reduced after laser cladding the Stellite12 alloy on it. At the same time, the S31000 stainless steel shows the phenomenon of corrosion pits with uneven size, while the Stellite12 alloy layer shows a relatively uniform corrosion behavior, though the corrosion phenomenon on the grain boundary is more obvious than that in the interdendrites.

Key words: high-temperature valve, laser cladding, microstructure, microhardness, uniform corrosion property

CLC Number:

TG178

Chen Lin, Jiang Yongbing, Shang Hongbao, Li Li, Zhang Pengqi, Jing Renrong. Microstructure and properties of laser clad Stellite12 alloy layer on S31000 stainless steel[J]. Heat Treatment of Metals, 2023, 48(2): 289-294.

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