Thermal Fatigue Resistance of SiC<sub>p</sub>/Ni35 Coating by Laser Cladding

Pan Chenggang; He Xiaolong; Ding Zizheng; Chang Qingming

doi:10.15980/j.tzzz.2018.03.002

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Thermal Fatigue Resistance of SiC_p/Ni35 Coating by Laser Cladding
Vol. 38, Issue 3, Pages: 238-241(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.03.002

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[1]潘成刚,贺晓龙,丁紫正,常庆明.激光熔覆SiC_p/Ni35覆层热疲劳性能研究[J].特种铸造及有色合金,2018,38(03):238-241.

Pan Chenggang, He Xiaolong, Ding Zizheng, et al. Thermal Fatigue Resistance of SiC_p/Ni35 Coating by Laser Cladding. [J]. Special Casting & Nonferrous Alloys 38(3):238-241(2018)
[1]潘成刚,贺晓龙,丁紫正,常庆明.激光熔覆SiC_p/Ni35覆层热疲劳性能研究[J].特种铸造及有色合金,2018,38(03):238-241. DOI： 10.15980/j.tzzz.2018.03.002.

Pan Chenggang, He Xiaolong, Ding Zizheng, et al. Thermal Fatigue Resistance of SiC_p/Ni35 Coating by Laser Cladding. [J]. Special Casting & Nonferrous Alloys 38(3):238-241(2018) DOI： 10.15980/j.tzzz.2018.03.002.

摘要

采用激光熔覆技术在H13钢表面制备了SiC

/Ni35

Ni@SiC

/Ni35和Cu@SiC

/Ni35复合覆层。用自制的热疲劳试验设备对覆层进行了600次热疲劳循环试验。用SEM-EDS对涂层微观组织进行观察。结果表明

添加了SiC

的激光熔覆层的热疲劳性能低于H13钢基体。熔覆层裂纹萌生于低强度、低热膨胀系数及不良浸润性的石墨

随后金属硅化物的氧化导致了裂纹的扩展。

Abstract

The SiC

/Ni35

Ni@SiC

/Ni35 and Cu@SiC

/Ni35 composite coatings on H13 steel were prepared by laser cladding.A kind of thermal fatigue test equipment which is more suitable for aluminum alloy die casting conditions was developed.The coatings were subjected to 600 thermal fatigue cycles.The coating microstructure was observed by SEM-EDS.The results show that thermal fatigue properties of laser cladding coatings with SiC

are lower than that of H13 steel substrate.The low strength and thermal expansion coefficient as well as poor wettability of graphite are responsible for crack initiation

and oxidation of metal silicides result in crack propagation.