摘要
为提高铝合金的机械性能,针对高冷速的选区激光熔化(selective laser melting,SLM)成形技术,设计Al-1Cu-1Mg-3Mn-0.8Sc-0.8Zr合金,研究SLM成形参数对设计合金的影响,以确定最优的成形工艺,并测试直接成形铝合金的机械性能.通过正交试验发现,激光功率和扫描速度是影响合金致密度和硬度的主要因素;不同成形参数对缺陷的影响研究表明,合金中不规则的冶金孔和裂纹等缺陷随激光功率的降低和线扫描速度的升高而增多,而激光功率过高或扫描速度过低会导致合金中出现大的圆形孔洞,最终确定的SLM成形Al-(Cu,Mg,Mn)-(Sc,Zr)合金最优工艺为:激光功率330 W,扫描速度900 mm/s,扫描间距0.12 mm;合金的抗拉强度为349 MPa,屈服强度为267 MPa,伸长率为7％.
Abstract
To improve the mechanical properties of aluminum alloys,Al-1Cu-1Mg-3Mn-0.8Sc-0.8Zr alloy was designed for se-lective laser melting(SLM)forming technology with a high cooling rate.In order to establish the best fabrication settings,the effect of SLM forming parameters on the designed alloy was studied and the mechanical properties of as-built alloy were evaluated.The orthogonal experiments revealed that the laser power and scanning speed are the key parameters affecting the densities and hardness of the alloy.According to the study of the effects of different processing parameters on defects,irregular metallurgical holes and cracks in the alloy increased with the decrease of the laser power and the increase of the scanning speed,while high laser power or low scanning speed would lead to large round holes in the alloy.The optimal fabrication parameters for Al-(Cu,Mg,Mn)-(Sc,Zr)alloy was determined as follows:laser power is 330 W,scanning speed is 900 mm/s,and hatch distance 0.12 mm.The alloy has a tensile strength of 349 MPa,a yield strength of 267 MPa,and an elongation of 7％.
基金项目
山西省基础研究计划(自由探索类)项目(20210302124100)
中北大学高层次人才引进科研启动项目(11013102)
中北大学研究生科技立项项目(20221822)
NETL
NSTL
万方数据