Comparison on mechanical behavior and microstructural features between traditional and AM AISI 316L

Abstract

The aim of the present work is to investigate the difference in mechanical behavior between AISI 316L obtained by the turning process and that obtained by selective laser melting (SLM). To obtain a correlation between mechanical behavior and microstructure, static tensile and fatigue tests were performed, monitoring the energy release of the material adopting, respectively, the static thermographic method (STM) and the Risitano's thermographic method (RTM). Failure analysis was performed using optical and scanning electron microscopy. The corrosion resistance was evaluated by the double‐loop electropotential reactivation (DL‐EPR). Worst mechanical properties, both under static and fatigue loading conditions, loss of corrosion resistance, and heat dissipation compared to traditional stainless steel have been found. These findings can be attributed to microstructural defects typical of the SLM printing technology.

The influence of printing strategies on fatigue crack growth behavior of an additively manufactured AISI 316L stainless steel

“…These results suggest that the multiple heating/cooling cycles combined with the soaking times at high temperatures experienced during SLM affect the microhardness evolution of components. The above microhardness values are also in accordance with those determined by Santonocito et al 20 for an AM 316L SS that were in the order of 226.47 ± 6 (HV0.5).…”

“…The fracture surfaces obtained in the experimental FCG tests were similar for all cases studied and resulted from a horizontally propagating macro crack propagation perpendicular to the direction of the load applied (Figure 6). Nevertheless, it can be seen from Figures 6 and 10A that the crack front tended to propagate along SLM interlayer deposited in a somewhat irregular way (Figures 6 and 10A) but, similarly to what was observed in Santonocito et al, 20 in a general transgranular manner along the propagation layer together with cleavage steps and without visible fatigue striations (Figure 10B,C). The surface morphology was also relatively irregular and rough, which could be attributed to the specificities of the manufacturing process.…”

Fatigue life evaluation of automotive mechanical components by using smart design algorithm

“…The fatigue of materials and mechanical components has been widely studied, as demonstrated in scientific literature. [5][6][7][8][9] Wang et al 10 have proposed a fatigue life prediction model of the component under random loading. The model has been used to calculate the degraded fatigue life of an automobile front stabilizer bar, which provides a theoretical basis for life estimation under random load spectrum.…”

“…In many engineering fields, such as marine, 1 aerospace, 2 and automotive, 3,4 the structures and components are subjected to fatigue failure due to irreversible microplastic deformation caused by dynamic stress, followed by crack propagation and final fracture of the component. The fatigue of materials and mechanical components has been widely studied, as demonstrated in scientific literature 5–9 . Wang et al 10 have proposed a fatigue life prediction model of the component under random loading.…”

Evaluation of the Corrosion Resistance of Watch Links from 316L and 904L Austenitic Stainless Steels Obtained by the Metal Injection Molding (MIM) Technique Intended to Be in Contact with Human Skin

“…They affect a very wide range of applications, such as the automotive industry, aerospace, medical devices, consumer products (watches, toys, jewelry, household items), etc. Currently, through knowledge and know-how, a multitude of alloys can be used (steels, stainless steels, nickel-based alloys, super alloys, titanium-based alloys [13][14][15][16], tantalum titanium, niobium alloys) [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Very interesting applications are found in dental medicine [34].…”