In this study, the solidification cracking susceptibility of the weld metal of additively manufactured 316L stainless steel was investigated. Laser powder bed fusion was employed to fabricate rectangular specimens with a thickness of 4 mm, and Trans-Varestraint tests were performed to evaluate the weldability of the specimens. Subsequently, the maximum crack lengths were measured and used as indices of susceptibility. The results showed that the weld metal of additively manufactured 316L stainless steel had higher susceptibility to solidification cracking than that of conventional wrought 316L stainless steel. The high susceptibility was considered mainly due to the primary austenite solidification mode in the weld metal of the additively manufactured specimen having a relatively higher content of nitrogen.

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This study investigates the gas tungsten arc (GTA) weldability of austenitic stainless steel (STS) 304 using STS 308L and high-entropy alloy (HEA) fillers and its applicability in cryogenic environments. Because the grain sizes of both weld metals (WMs) were coarser than those of base metal (BM), and all WMs have a few phase transformations, the tensile properties of all WMs were worse than that of the BM. However, the tensile strength and elongation of HEA weld at 77 K increased simultaneously than those at 298 K, whereas the elongation of STS 308L weld decreased at 77 K than that at 298 K. All WMs exhibited excellent tensile strengths at 77 K, attributable to martensite transformations and deformation twins, respectively.

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Abstract:The aim of this study is to investigate the low-cycle fatigue (LCF) properties of an AISI 304L welded joint based on experimental data. The influential parameters on the LCF such as the specimen thickness, strain ratio and cryogenic temperature were considered in this experimental study. In order to investigate the thickness effect on the LCF behavior, two types of specimens with thicknesses of 5 mm and 10 mm were used in an LCF test. In addition, the fatigue tests were conducted under strain control with three different strain ratios of R = −1, 0, and 0.5 at room and cryogenic temperatures. Based on the results obtained by this experimental study, no significant effect involved with the thickness and the strain ratio were observed. However, it was clearly observed that LCF performance at room temperature is lower than that at cryogenic temperature. Finally, an LCF design curve that can be used in design of the liquefied natural gas (LNG) applications is suggested.