The effect of heat treatment on the cyclic deformation behaviour of AlSi10Mg aluminium alloy manufactured by laser powder bed fusion (LPBF) was investigated. Uniaxial fully-reversed strain-controlled fatigue tests were conducted on polished smooth specimens in the low-cycle and high-cycle fatigue regimes for three material states: no heat treatment, stress relief heat treatment and T6 heat treatment. The effect of the heat treatment on microstructure, ductility, hardness and tensile properties was also investigated. It was found that the microstructural transformation associated with the heat treatments increased the ductility, and reduced the hardness, the tensile strength, and the fatigue resistance, particularly in the low-cycle fatigue regime. Thus, these standard heat treatments used in conventional heat-treatable aluminium alloys are not recommended for LPBD aluminium alloys subjected to cyclic strain loading.

研究了热处理对激光粉末床熔合（LPBF）制备的AlSi10Mg铝合金循环变形行为的影响。在低周和高周疲劳状态下对抛光光滑试样进行了单轴全反向应变控制疲劳试验，用于三种材料状态：无热处理、去应力热处理和 T6 热处理。还研究了热处理对显微组织、延展性、硬度和拉伸性能的影响。发现与热处理相关的微观结构转变增加了延展性，降低了硬度、抗拉强度和抗疲劳性，特别是在低周疲劳状态下。因此，