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Effect of Heat Treatments on Residual Stress and Properties of AISI 316L Steel Processed by Directed Energy Deposition
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-06 , DOI: 10.1007/s11665-020-05061-9
Alberta Aversa , Gabriele Piscopo , Alessandro Salmi , Mariangela Lombardi

AISI 316L stainless steel samples were produced by means of laser powder-directed energy deposition using optimized building conditions with two different deposition strategies. The samples, in the as-built state, were at first characterized in terms of microstructure, hardness and residual stresses by the incremental hole-drilling strain-gauge method. The results highlighted that the deposition strategy mainly affects the residual stress values, while the material hardness value is not strongly varied. The distribution of the residual stresses along the sample height was also evaluated by measuring the stress at different distances from the building platform. Furthermore, some samples underwent a homogenizing heat treatment for 2 h at 600 and 800 °C and were characterized and compared with the as-built ones. The results showed that the suggested heat treatments allow not only a reduction in residual stresses but also the homogenization of the microstructure confirmed by comparing the variations of the Vickers hardness values along the building direction. Tensile tests were also performed on the as-built and heat-treated samples in order to investigate the effect of the heat treatment on the tensile properties of the material.



中文翻译:

热处理对定向能沉积AISI 316L钢残余应力和性能的影响

AISI 316L不锈钢样品是采用优化的建筑条件和两种不同的沉积策略,通过激光粉末定向能量沉积法生产的。首先,通过增量式钻孔应变仪对样品在建成状态下的微观结构,硬度和残余应力进行了表征。结果表明,沉积策略主要影响残余应力值,而材料硬度值变化不大。还通过测量距建筑平台不同距离处的应力来评估残余应力沿样品高度的分布。此外,对一些样品在600和800°C下进行了2 h的均质热处理,并对其特性进行了表征并与已建成的样品进行了比较。结果表明,建议的热处理不仅可以减少残余应力,而且还可以通过比较维氏硬度值沿建筑方向的变化来确认组织的均匀化。为了研究热处理对材料拉伸性能的影响,还对完工和热处理过的样品进行了拉伸试验。

更新日期:2020-09-07
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