Mechanisms controlling fracture toughness of additively manufactured stainless steel 316L

Abstract

Additive manufacturing (AM) has emerged as an alternative tool to overcome the challenges in conventionally processed metallic components. It is gaining wide acceptability because of the superior properties of the manufactured components compared to their wrought processed counterparts. Among the available AM processed materials, austenitic stainless steel 316L is widely explored wherein an excellent strength-ductility trade-off has been reported. However, the mechanisms underlying fracture toughness of AM stainless steel 316L vis-a `-vis

Microstructure, Mechanical Properties, and Corrosion Behavior of 06Cr15Ni4CuMo Processed by Using Selective Laser Melting

“…In the case of the SLM-processed material, the strength of the alloy increased because of the following factors: (1) a refined microstructure (crystallite size-16.55 nm); (2) the presence of a single martensitic phase; an increased volume of dislocation density (5 × 10 14 m/m 3 ), which was one or two orders of magnitude higher than the values observed for the wrought specimens; and (4) solid solution strengthening [4,14,30,32,[82][83][84]. It is also for the very same reason that the increase in the volume of dislocations (dislocation density) leaves little room for the additional generation of dislocation and dislocation movement during mechanical loading.…”

“…Figure 5. (a) True stress-strain curves for the SLM-fabricated 06Cr15Ni4CuMo and wrough martensitic steel samples; (b,c) fracture surface observed in the SLM-fabricated 06Cr15Ni4C sample.In the case of the SLM-processed material, the strength of the alloy increased bec of the following factors: (1) a refined microstructure (crystallite size-16.55 nm); (2 presence of a single martensitic phase; (3) an increased volume of dislocation density 10 14 m/m 3 ), which was one or two orders of magnitude higher than the values obse for the wrought specimens; and (4) solid solution strengthening[4,14,30,32,[82][83][84].…”

“…The potential recycling of the feedstock leads to materials saving [13], making it a green technology. Different AM processes such as electron beam melting (EBM), fused deposition modeling (FDM), wire arc additive manufacturing (WAAM), etc., have been developed in the last decade, also including selective laser melting (SLM)/laser powder bed fusion process (LPBF) [14][15][16].…”

Metallic Coatings through Additive Manufacturing: A Review

“…The high-dimensional stability obtained through this method whilst producing intricate and complex shapes makes it the most popular method in the metallic coating AM technologies. A wide range of printable powders (materials composition including Al-based [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ], Fe-based [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ], Cu-based [ 52 , 53 , 54 , 55 , 56 , 57 ], Ni-based [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ], Ti-based [ 68 , 69 , 70 , 71 , 72 , 73 , 74 ], Mo-based […”

A critical review on the effects of process-induced porosity on the mechanical properties of alloys fabricated by laser powder bed fusion

“…Higher yield strength attributed to poorer fracture toughness (K Q : 63 -87 MPa m 0.5 ) as compared to conventional 316L (K IC : 112 -278 MPa m 0.5 ) Interconnected pores also found in the LPBF samples Fracture toughness was lower when notch was oriented parallel to melt-pool boundaries. Could be due to LoF pores located along these boundaries promoting crack propagation [228] 316L…”