Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy.
Department of Mechanical Engineering, Karabuk University, Karabuk, Turkey.
Sci Rep. 2023 Mar 21;13(1):4602. doi: 10.1038/s41598-023-30660-6.
A hybrid post-treatment combining tumble finishing as a final step after shot peening and heat treatment was developed to alleviate the adverse effects of internal and surface defects on the fatigue performance of laser powder bed fusion AlSi10Mg samples. The effects of each post-treatment were investigated individually and synergistically on microstructure, surface morphology and roughness, hardness, residual stresses, porosity, and rotating bending fatigue behavior of V-notched AlSi10Mg samples. The results reveal that tumble finishing can highly reduce surface roughness by 28 and 32% compared to the as-built and heat-treated states while inducing extra surface layer hardening and compressive residual stresses. The hybrid post-treatment of heat treatment + shot peening + tumble finishing significantly increased the fatigue life of the samples by over 500 times higher compared to the as-built series.
一种混合后处理工艺，在喷丸和热处理后增加滚筒抛光作为最后一道工序，以减轻激光粉末床熔合 AlSi10Mg 样品内部和表面缺陷对疲劳性能的不利影响。分别研究了每种后处理工艺对微观结构、表面形貌和粗糙度、硬度、残余应力、孔隙率以及 V 型缺口 AlSi10Mg 样品的旋转弯曲疲劳性能的影响。结果表明，与铸态和热处理状态相比，滚筒抛光可使表面粗糙度分别降低 28%和 32%，同时还能诱导额外的表面层硬化和压应力。与铸态系列相比，热处理+喷丸+滚筒抛光的混合后处理工艺使样品的疲劳寿命显著提高了 500 多倍。
