Anisotropy of Mechanical Properties and its Correlation with the Structure of the Stainless Steel 316L Produced by the SLM Method

Texture control of 316L parts by modulation of the melt pool morphology in selective laser melting

“…Despite generally superior mechanical monotonous performances, an important microstructure and mechanical anisotropy in SLM 316L, depending mainly on the sample orientation, laser scanning strategies, and main parameters (power, speed, hatch spacing) has been noticed by many authors. Casati et al (2016) and Deev et al (2016) both observed superior mechanical performance for horizontally built specimens. Suryawanshi et al (2017) observed that single melt scanning strategies offered better tensile properties than chess scanning strategies, despite a higher porosity.…”

Residual Stresses Analysis in AISI 316L Processed by Selective Laser Melting (SLM) Treated by Mechanical Post-Processing Treatments

“…Micro-hardness: In order to have some indication on the micro-hardness of parts produced by additive manufacturing, previous studies reveal a value of micro-hardness of 316L SS SLM between 210 HV 1000 and 240 HV 1000 : [16] speaks about 235 HV, [17] reports values between 210 and 240 HV 1000 , [18] 216 HV 1000 , [19] 228 HV, [11] 225 HV 1000 . In our case, the as-fabricated sample shows a micro-hardness around 240 HV 0.025 near the surface and 205 HV 0.025 in the bulk which is in accordance with literature.…”

“…It shows that SMAT modifies the mechanical behaviour drastically, with a high reduction of elongation and an increase in yield strength and tensile strength. Indeed, asfabricated samples exhibit a uniform elongation of 31 19. ± 2.33 % with mechanical properties of 557 ± 15 MPa for Yield Strength (YS) and 859 ± 11 MPa for Ultimate Tensile Test (UTS).…”

Structure and Properties of the Bulk Standard Samples and Cellular Energy Absorbers

“…Taking into account the fact that in the building process the contour of the future layer is firstly melted by the laser, and then the layer itself is hatched, the microstructure of the contour layer will differ from the microstructure of the hatching layers. Thus, the KCU of a specimen with a mechanically made notch will be higher than that of a specimen with a grown notch [17]. However, even under such unequal conditions of testing, a rather large anisotropy is observed.…”

“…A completely different case was observed on the horizontally built samples, in which the tension occurred in the center of the sample body. It can be assumed that this is due to the structure as well as properties anisotropy of the additive material, depending on the samples disposal during the SLM process [17]. Presumably, such unsatisfactory values can be the result of the structural heterogeneity after SLM process.…”