Investigation of the Microstructure and Properties of NiCrBSi Coating Obtained by Laser Cladding with Different Process
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ORIGINAL ARTICLE
Investigation of the Microstructure and Properties of NiCrBSi Coating Obtained by Laser Cladding with Different Process Parameters Guofang Hu1 • Yong Yang2 • Kang Qi1 • Xin Lu1 • Jindong Li1
Received: 3 February 2020 / Accepted: 7 August 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract In this paper, the effects of laser power, spot diameter, and scanning speed on the performance of laser cladding NiCrBSi alloy coating on 42CrMo steel substrate were studied, and nine orthogonal experiments were designed for experiment. The experimental data of OM morphology, microstructure, microhardness and wear property of coating were analyzed by using the methods of visual analysis and range analysis. The results show that laser power is the main factor affecting the height of the cladding coating. The spot diameter has the largest effect on the width of the cladding coating. The scanning speed has a significant effect on the depth of the molten pool. The laser power has the greatest influence on the microhardness and wear resistance of the cladding coating. As the laser power increases, the microhardness of the cladding coating decreases. The wear forms of the cladding coating are mainly abrasive and adhesive wear. Keywords NiCrBSi coating Laser cladding Microstructure Orthogonal experiments Process parameters
& Yong Yang [email protected] 1
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266033, People’s Republic of China
2
Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education, Qingdao University of Technology, Qingdao 266520, People’s Republic of China
1 Introduction The pulling-straightening roller is one of the most important parts of the continuous casting machine, and its surface quality directly affects the flatness and quality of the formed slab. Therefore, the working layer of the pullingstraightening roller body must have excellent high-temperature wear resistance and thermal fatigue resistance. However, due to long-term work in the harsh environment of high temperature and humidity, corrosion, spalling, thermal fatigue crack and other failures will occur on the surface of the pulling-straightening roller, which will seriously affect the quality of the formed slab [1, 2]. At present, the average life of the continuous casting machine pulling-straightening rollers in steel enterprises is only about 3 to 6 months. The downtime repair after the failure of the pulling-straightening roller not only restricts the company’s product productivity but also increases its production costs. At the current stage, the repair measures for the pulling-straightening roller are surfacing welding. But surfacing welding technology is complicated and easy to produce defects such as cracks, welds, slag inclusion, and overlap [3, 4]. Traditional repair methods have been unable to meet the requirements for long life and high quality of the pulling-straightening roller. In order to improve the surface quality and prolong
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