Effect of HIP Process on Fatigue Performance for SS 316L Manufactured by PBF

Additive manufacturing (AM) is an interesting technology with the potential to replace general fabrication techniques such as machining, forming and casting. AM provides two main benefits: greater freedom of part design and lower material consumption. To improve quality, many researchers have investigated the mechanical characteristics of AM products and additive parameters. In the present study, tensile and fatigue tests were conducted on stainless steel (SS) 316L manufactured using powder bed fusion (PBF) technology. These tests were carried out using two different building directions, along the Z and X axis, to investigate the effect of additive direction. In addition, the effects of hot isostatic pressing (HIP) related to fatigue properties, which can influence the volume density and porosity of the specimen, was studied. Based on the test results, changes in the mechanical characteristic and fatigue strength due to the HIP treatment were investigated. Key words: Additive manufacturing, Fatigue test, Stainless steel 316L, Powder bed fusion, Hot isostatic pressing