Xiao Jinrui, Zou Tao, Zhang Yiteng, Zhao Zhuan, Tang Gongbin, Xie Xincheng, Liang Zhongwei, Liu Xiaochu
Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-Performance Machining, Guangzhou University, Guangzhou 510006, China.
School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China.
Materials (Basel). 2022 Oct 17;15(20):7227. doi: 10.3390/ma15207227.
Selective laser melted (SLM) 316L stainless steel (SS) has been widely employed in the fields of designing and manufacturing components with complex shapes and sizes. However, the low yield strength, low ultimate tensile stress, and low hardness of SLM 316L SS components hinder its further application. In this work, the strengthening grinding process (SGP) was used to enhance the mechanical properties of SLM 316L SS. The microhardness, residual stress, microstructure, and tensile properties of all the samples were analyzed. The results demonstrate that the SGP induced higher compressive residual stress and microhardness, as well as higher tensile properties. The maximum hardness and residual stress reached 354.5 HV and -446 MPa, respectively, indicating that the SGP resulted in a plastic deformation layer over 150 μm. The possible mechanisms have been discussed in further detail. Compared to the untreated sample, the SGP sample shows a significant improvement in yield strength (YS), ultimate tensile stress (UTS), and elongation (EL), increasing 30%, 25.5%, and 99.1%, respectively. This work demonstrates that SGP treatment could be an efficient approach to simultaneously improving the strength and ductility of the SLM 316L SS, which makes it more suitable for engineering applications.
选择性激光熔化（SLM）316L不锈钢（SS）已被广泛应用于设计和制造具有复杂形状和尺寸的部件领域。然而，SLM 316L SS部件的低屈服强度、低极限拉伸应力和低硬度阻碍了其进一步应用。在这项工作中，采用强化磨削工艺（SGP）来提高SLM 316L SS的力学性能。分析了所有样品的显微硬度、残余应力、微观结构和拉伸性能。结果表明，SGP诱导了更高的压缩残余应力和显微硬度，以及更高的拉伸性能。最大硬度和残余应力分别达到354.5 HV和-446 MPa，表明SGP导致了超过150μm的塑性变形层。对可能的机制进行了更详细的讨论。与未处理的样品相比，SGP处理后的样品在屈服强度（YS）、极限拉伸应力（UTS）和伸长率（EL）方面有显著提高，分别提高了30%、25.5%和99.1%。这项工作表明，SGP处理可能是一种同时提高SLM 316L SS强度和延展性的有效方法，使其更适合工程应用。
