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首页> 外文期刊>Applied Surface Science >Analysis Of Crack Behavior For Ni-based Wc Composite Coatings By Laser Cladding And Crack-free Realization
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Analysis Of Crack Behavior For Ni-based Wc Composite Coatings By Laser Cladding And Crack-free Realization

机译：镍基碳化钨复合涂层的激光熔覆裂纹行为分析及无裂纹实现

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摘要

The crack behavior of Ni-based WC composite coatings by laser cladding was investigated. The results showed that cracks originated from the interface of the composite coating and the substrate, and then passed through the precipitated carbides due to the dissolution of WC particles. To increase the efficiency of laser cladding and eliminate the well-known crack problems in the composite coatings, laser induction hybrid rapid cladding (LIHRC) was carried out experiments to produce Ni-based WC composite coatings on A3 mild steel. The laser scanning speed and the powder flow rate increased with the increasing of the preheated average temperature of the substrate during LIHRC. The dissolution of WC particles decreased due to high laser scanning speed, contributing to reduce the porosities in the composite coatings. Moreover, the temperature gradient decreased with the increasing of the preheated average temperature of the substrate during LIHRC, which was the main reason why Ni-based WC composite coatings were free of cracks.
机译：研究了激光熔覆Ni基WC复合涂层的裂纹行为。结果表明，裂纹起源于复合涂层和基体的界面，然后由于WC颗粒的溶解而穿过沉淀的碳化物。为了提高激光熔覆效率并消除复合涂层中众所周知的裂纹问题，进行了激光感应混合快速熔覆（LIHRC）实验，以在A3低碳钢上生产Ni基WC复合涂层。激光扫描速度和粉末流量随LIHRC过程中基板预热平均温度的增加而增加。由于激光扫描速度高，WC颗粒的溶解度降低，从而有助于降低复合涂层中的孔隙率。此外，在LIHRC期间，温度梯度随着基材预热平均温度的升高而降低，这是Ni基WC复合涂层无裂纹的主要原因。

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