基于响应面优化法激光选区熔化AlMgScZr研究

Study on selective laser melting process of AlMgScZr based on response surface optimization methodology

摘要:

铝合金因其轻质、高强而被广泛应用于国防建设及航空航天等领域中，而激光选区熔化（SLM）技术在复杂结构零件的制造上具有很大的优势．采用SLM技术制备AlMgScZr合金，通过响应面优化的方法对其工艺参数进行了优化，得到了相对密度为99.11%、抗拉强度为333 MPa、屈服强度为282 MPa、延伸率为16 %和显微硬度为119.5 HV0.05的AlMgScZr铝合金试样．同时，研究了热处理对SLMAlMgScZr试样拉伸性能的影响，发现经过350 ℃保温6 h，随后在氩气气氛中冷却的热处理后，试样的抗拉强度升高到561.9 MPa，屈服强度提高至546.8 MPa，延伸率为5.2 %．通过响应面参数优化得到了性能优异的高强度铝合金，为SLM制备AlMgScZr合金的应用提供了理论参考．

Abstract:

Aluminum alloys are widely used in the fields of national defense construction and aerospace due to its light weight and high strength. Notably, selective laser melting technology (SLM) has great advantages in the manufacture of complex structural parts. In this study, AlMgScZr alloy was prepared by SLM technology, and the process parameters were optimized by the response surface optimization method. The samples with relative density of 99.11%, tensile strength of 333 MPa, yield strength of 282 MPa, elongation of 16% and microhardness of 119.5HV0.05 were achieved. At the same time, the effect of heat treatment on the tensile properties of SLM AlMgScZr samples was studied. It was found that after heat treatment at 350 ℃ for 6 h and then cooling in an argon atmosphere, the tensile strength of the samples increased to 561.9 MPa and the yield strength increased to 546.8 MPa, and the elongation was 5.2%. A high strength aluminum alloy with excellent properties was obtained by optimizing the response surface parameters, which provided a theoretical reference for the application of AlMgScZr alloy prepared by SLM.