论文部分内容阅读
对Fe40Al60粉末压坯进行激光点燃自蔓延烧结,利用XRD、金相、硬度等表征手段,分析烧结合金表层区、中部区和底部区的微观组织结构及宏观性能,并采用有限元分析方法,对Fe40Al60激光烧结过程的温度场进行数值模拟,得到了烧结过程温度场分布云图和路径图。结果表明:表层区产物相主要为FeAl、Al_2O_3,中部区产物相为Fe_3Al、FeAl、Al_2O_3,底层区产物相为Fe_3Al、Al_2O_3和Fe;烧结合金表层区组织为条状,中部区组织为胞状,底层区组织为针状;表层区硬度HV为9010 MPa,中间层硬度HV为10 050 MPa,底层区硬度HV为9650 MPa。模拟结果表明:10 s时,表层区温度最高为1150 K,中部区温度为894.033 K,底层区温度最低为820.979 K。表明试样各区域物相与该区温度场模拟结果相一致。
The microstructure and macro-properties of the sintered compact were analyzed by XRD, metallography and hardness. The microstructure and properties of the sintered compact were analyzed by finite element method The temperature field of Fe40Al60 laser sintering process is numerically simulated, and the temperature field distribution and path map of sintering process are obtained. The results show that the main phases of the surface layer are FeAl and Al_2O_3, the middle phase is Fe_3Al, FeAl and Al_2O_3, the bottom phase is Fe_3Al, Al_2O_3 and Fe. The surface layer of the sintered alloy is strip-like, The underlying zone was acicular; the HV of the surface layer was 9010 MPa, the HV of the middle layer was 10 050 MPa and the HV of the bottom layer was 9650 MPa. The simulation results show that the surface temperature is 1150 K at 10 s, the temperature in the middle is 894.033 K, and the temperature in the bottom is 820.979 K. It shows that the phase of each region in the sample is consistent with the simulation results of the temperature field in this region.