激光选区熔化Cu-10Sn合金组织和性能研究

Research on Cu-10Sn Alloy Structure and Properties of Laser Selective Melting

激光选区熔化(Selective laser melting, SLM)作为一种新型的增材制造技术,在铜合金的生产中越来越受到重视。采用SLM的方法成形了Cu-10Sn合金试样,研究了工艺参数(激光功率、扫描速度、扫描间距)对SLM成形件致密度的影响,分析了不同工艺参数下的微观组织演变及力学性能变化规律。经过工艺参数优化,获得了最高致密度为99.26%的试样,并研究了其在退火热处理前后的组织演变和力学性能差异。结果表明,SLM成形铜锡合金的显微组织由α-Cu相及其亚稳相和极少的δ相组成,热处理后亚稳相高温分解,使得显微微观组织更加均匀化。铜锡合金的力学性能随着退火热处理温度的升高有所降低,但其塑性增强较为明显。该研究结果为分析热处理对SLM成形铜锡合金材料的显微组织和性能的影响提供了实验依据,对该材料的应用有一定的参考价值。

Selective laser melting(SLM),as a new additive manufacturing technology,has been paid more and more attention in the production of copper alloys.The Cu-10Sn alloy samples were formed by SLM method,it was studied that the effects of the process parameters(laser power,scanning speed,scanning distance)on the density of the SLM forming parts,and the microstructure evolution and mechanical properties under different process parameters were analyzed.The microstructure evolution and mechanical properties of the samples with the highest density of 99.26%were studied after the process parameters were optimized.The results showed that the microstructure of SLM formed Cu-Sn alloy was composed ofα-Cu phase,metastable phase and very littleδphase,and the metastable phase decomposed at high temperature after heat treatment,which made the microstructure more uniform.The mechanical properties of Cu-Sn alloy decreased with the increase of annealing temperature,but its shape enhancement was obvious.The results provided an experimental basis for the effect of heat treatment on the microstructure and properties of SLM formed Cu-Sn alloy materials,and had a certain reference value for the application of the material.