Experimental study on laser cladding process parameters of martensitic stainless steel powder on Plain Carbon Steel: Cladding Geometry, dilution Ratio and Sample Hardness

Modares Mechanical Engineering Pub Date : 2022-03-01 DOI:10.52547/mme.22.4.243

J. Rafiei, A. Ghasemi

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Abstract

The laser cladding of industrial parts to improve their mechanical properties by metal alloys and composites has been a challenge for scientists and experts. The quality and properties of the cladding layer are determined by many factors such as cladding geometry, microstructure, dilution ratio, defects, distortion, surface smoothness, metallurgical changes in the substrate and process efficiency. In this paper, the effect of important parameters of the cladding process on the geometric shape, hardness and dilution ratio of the cladding layers of martensitic stainless steel (17-4 PH ) on the substrate of plain carbon steel by solid-state continuous laser with maximum power 2 kW and the method of direct deposition of metal powder are discussed. Variable parameters of laser cladding including powder feed rate, laser scanning speed and laser power have been studied. The parameters of surface quality, geometric shape and absence of porosity have been evaluated and compared. The minimum dilution about 9% was obtained at a 10 mm/s scanning speed, 10 g/min powder feed rate and 330 watts laser power. The results have been showed, appropriate incorporation and uniform distribution of cladding powder has created a cladding surface without any crack and porosity. By studying the hardness of the samples, it has been concluded that the hardness of the substrate surface has increased after cladding. on Cladding of Martensitic Stainless-Steel on Plain Carbon Steel: Cladding Geometry,

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马氏体不锈钢粉末在普通碳钢上激光熔覆工艺参数的实验研究:熔覆几何形状、稀释比和试样硬度

用激光熔覆金属合金和复合材料来改善工业零件的机械性能一直是科学家和专家面临的挑战。熔覆层的质量和性能是由熔覆层的几何形状、微观结构、稀释比、缺陷、变形、表面光洁度、基材的冶金变化和工艺效率等诸多因素决定的。本文采用最大功率2 kW的固态连续激光和直接沉积金属粉末的方法，讨论了熔覆过程中重要参数对马氏体不锈钢(17-4 PH)在普通碳钢基体上熔覆层的几何形状、硬度和稀释率的影响。研究了激光熔覆过程中进料速度、激光扫描速度和激光功率等参数的变化规律。对表面质量、几何形状和无孔隙度等参数进行了评价和比较。在扫描速度为10 mm/s、给粉速度为10 g/min、激光功率为330瓦的条件下，稀释度最小约为9%。结果表明，包层粉末的适当掺入和均匀分布使包层表面无裂纹和孔隙。通过对样品硬度的研究，得出熔覆后基体表面硬度有所提高的结论。马氏体不锈钢在普通碳钢上的包覆:包覆几何

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Modares Mechanical Engineering

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