基于响应面法的球墨铸铁激光表面硬化工艺参数优化

doi:10.13251/j.issn.0254-6051.2025.09.034

摘要/Abstract

摘要： 以QT600-3A球墨铸铁为基材,基于响应面法的中心复合设计,建立了激光功率、扫描速度与表面硬度、表面粗糙度、硬化层深度之间的数学模型,对其激光表面硬化工艺参数进行了优化。结果表明,在激光功率1440~1510 W,扫描速度2.6~5.4 mm/s范围内,扫描速度对硬化效果的影响较为显著,激光功率的影响相对较小。表面硬度随激光功率的增大和扫描速度的减小而增大;表面粗糙度随激光功率的减小和扫描速度的增大而减小;硬化层深度随激光功率的增大和扫描速度的减小而增大。采用满意度函数法进行多目标优化,以表面硬度最大、表面粗糙度最小及硬化层深度最大为优化目标,得到最优工艺参数组合为激光功率1510 W、扫描速度2.6 mm/s,该工艺参数下表面硬度为58.59 HRC、表面粗糙度为5.897 μm、硬化层深度为1450.74 μm,此时整体的复合合意度为0.8776。

关键词: 响应面法, 激光表面硬化, 工艺参数, 球墨铸铁

Abstract: Taking QT600-3A ductile iron as the substrate, a mathematical model among laser power, scanning speed, and surface hardness, surface roughness, case depth was established based on the central composite design (CCD) of the response surface method (RSM), and the laser surface hardening process parameters were optimized. The results show that within the range of laser power 1440-1510 W and scanning speed 2.6-5.4 mm/s, the influence of scanning speed on the hardening effect is more significant, while the influence of laser power is relatively smaller. The surface hardness increases with the increase of laser power and the decrease of scanning speed. The surface roughness decreases with the decrease of laser power and the increase of scanning speed. The case depth increases with the increase of laser power and the decrease of scanning speed. By adopting the desirability function method for multi-objective optimization, with the maximum surface hardness, minimum surface roughness, and maximum case depth as the optimization objectives, the optimal process parameter combination is determined as laser power of 1510 W and scanning speed of 2.6 mm/s, under which the surface hardness is 58.59 HRC, the surface roughness is 5.587 μm, the case depth is 1450.74 μm, and the overall composite desirability is 0.8776.

Key words: response surface method, laser surface hardening, process parameters, ductile iron

中图分类号:

TG163

蒋程杰, 刘建永, 王子乐. 基于响应面法的球墨铸铁激光表面硬化工艺参数优化[J]. 金属热处理, 2025, 50(9): 214-222.

Jiang Chengjie, Liu Jianyong, Wang Zile. Optimization of laser surface hardening process parameters for ductile iron based on response surface method[J]. Heat Treatment of Metals, 2025, 50(9): 214-222.

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