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H13钢表面激光熔覆耐磨涂层正交化工艺研究
引用本文:刘思奇,郭衍束,杨玉玲,董丹阳,吴林辉.H13钢表面激光熔覆耐磨涂层正交化工艺研究[J].激光技术,2015,39(3):399-404.
作者姓名:刘思奇  郭衍束  杨玉玲  董丹阳  吴林辉
作者单位:1.东北大学 理学院, 沈阳 110819
摘    要:为了改善H13钢表面性能,采用激光熔覆方法,在H13钢表面制备了Co42高硬度涂层。对不同工艺下涂层的稀释率、粗糙度、表面形貌、显微组织及硬度分布等进行了测试分析。最佳工艺参量为离焦量20mm、扫描速率1.7mm/s、脉宽2.0ms、频率30Hz。此参量下制备的熔覆层厚度约为230m,显微组织为致密细小的枝晶结构,与基底形成了良好的冶金结合。自熔覆层至基底,显微硬度梯度下降。熔覆层内的平均显微硬度为650HV0.1,为基体硬度(240HV0.1)的2.7倍,显著提高了H13钢的表面性能。结果表明,工艺参量(离焦量、扫描速率、脉宽、频率)对涂层的稀释率、粗糙度和表面形貌等有很大影响。这一结果对推动搅拌摩擦焊技术的发展是有帮助的。

关 键 词:激光技术    搅拌摩擦焊    耐磨涂层    正交化研究    显微组织及硬度
收稿时间:2014-03-07

Investigation on orthogonal experiments of laser cladding anti-wear resistance coating on H13 steel
Abstract:In order to improve the surface property of H13 steel, Co42 anti-wear resistance coating was performed by laser cladding method on the surface of H13 steel. The dilution ratio, surface roughness, and the surface morphology of the samples obtained under different parameters were investigated. The proper parameters for laser cladding were as following: defocus value of 20mm, laser scan speed of 1.7mm/s, pulse width of 2.0ms, and pulse frequency of 30Hz. The microstructure of the coating was characterized as fine dendrites with a thickness of 230m. The microhardness presented a gradient decreased from the coating to the substrate. The microhardness in the coating was 650HV0.1, which was about 2.7 times of that of the substrate. The results show that the parameters including defocus value, laser scan speed, pulse frequency, and pulse width influence the above three properties of the coating. This result is helpful for improving friction stir welding technology.
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