Tensile and Microstructural Characteristics of Fe-24Mn Steel Welds for Cryogenic Applications

Choi, Myeonghwan; Lee, Junghoon; Nam, Hyunbin; Kang, Ning; Kim, Myeonghyun; Cho, Dae-Won

doi:10.1007/s12540-019-00320-4

Cited by 38 publications

(9 citation statements)

References 33 publications

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“…In order to identify and compare the difference of the residual stress in view of the dislocation density (or the internally stored strain energy) as the influence of the heat treatment on the workpiece material, the IQ (image quality) map and the IPF (Inverse Pole Figure) map, as well as the KAM (kernel average misorientation) map, were examined. To this end, the EBSD (electron backscatter diffraction) analysis was carried out by using the FE-SEM (field-emission scanning electron microscopy) of TESCAN MIRA3 at an acceleration voltage of 15 kV, after which the obtained EBSD data were analyzed by adopting the orientation imaging microscopy software (TSL OIM 7.3.1) [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Numerical and Experimental Investigations on Residual Stress and Hardness within a Cold Forward Extruded Preform

2023

Materials

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Using a preform fabricated by a cold forward extrusion process, the present study numerically predicted and experimentally investigated its residual stress and microstructural characteristics, as well as its plastic deformation damage and hardness. Prior to realizing the preform, AISI 1035 cold-drawn medium carbon steel material with a diameter of 50.0 mm and a height of 121.0 mm is first spheroidized and annealed, after which phosphophyllite is used to coat its outer surface. To identify the influence of the spheroidizing and annealing on the mechanical properties and the microstructural phase, uniaxial compression tests and microscopic observations are carried out. After assuming the deformation behavior of the workpiece during the cold forward extrusion with a plastic material model and with an elasto-plastic material model, separately, three-dimensional finite element simulations are adopted to visualize the residual stress and the plastic deformation damage. The preform produced by cold forward extrusion is fully scanned by using an optical 3D scanner, the Vickers micro-hardness is measured, and the residual stress through EBSD (electron backscatter diffraction) analysis is observed. Briefly, the results show that the ferrite and pearlite within the raw workpiece is well spheroidized by the heat treatment, and that there is a decrease in the KAM (kernel average misorientation) value of about 40%. In terms of the preform obtained by the cold forward extrusion, the dimensional requirement is more suitably met with the predicted layout when adopting the elasto-plastic material model than that of the plastic material one, and the numerically predicted residual stress agrees with the Vickers micro-hardness distribution. It can be verified that the dislocation density (or the internally stored strain energy) based on the IQ map and the IPF map is substantially increased around the extrusion region, and that the KAM value is increased by roughly 516% as the whole average of the observed values.

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Section: Resultsmentioning

confidence: 99%

Numerical and Experimental Investigations on Residual Stress and Hardness within a Cold Forward Extruded Preform

2023

Materials

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“…However, this study observed a small fraction of martensite transformation in the WM by the dilution of Fe components in the STS 304 BM. Thus, deformation twins and martensite transformations occurred in the WM at 298 K [38]. Furthermore, as the tensile testing temperature decreased from 298 to 77 K, the stacking fault energy (SFE) of the welds decreased, thereby increasing the fraction of deformation twins and martensite transformation [39, 40].…”

Section: Resultsmentioning

confidence: 99%

Gas tungsten arc weldability of stainless steel 304 using CoCrFeMnNi filler metals for cryogenic applications

Nam

Moon

Park³

et al. 2022

Science and Technology of Welding and Joining

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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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“…Owing to the excellent comprehensive properties at cryogenic temperature and room temperature, as well as the low cost [ 4 , 5 , 6 ], the high manganese austenitic cryogenic steel (high-Mn steel) has attracted wide attention recently [ 7 , 8 ]. A tremendous amount of existing research reported that high-Mn steel can meet the requirements of cryogenic service of cargo and fuel tanks of LNG carriers and LNG-fueled ships [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Novel High Manganese Austenitic Steel Welded Joints by Arc Welding for Cryogenic Applications of LNG Tanks

Zhang

Wang

et al. 2023

Materials

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The novel high-Mn austenitic steel is becoming a promising steel for cryogenic applications of LNG tanks. The welded joints take a critical role in cryogenic service for storage tanks. In this work, we developed well-matched high-Mn welding consumables and prepared the welded joints by shielded metal arc welding (SMAW), submerged arc welding (SAW) and gas tungsten arc welding (GTAW). The detailed welding parameters were proposed first, then the welding quality, mechanical properties, and microstructure were investigated. The results show that good welding quality, excellent mechanical properties, and stable levels of mechanical properties were obtained for high-Mn steel welded joints using similar welding consumables, the solid core of electrodes, and solid welding wires. Notably, the lowest cryogenic absorbed energy was found at 5 mm away from the fusion line rather than at the fusion line. The hardness of the welded joints was detected to be less than 280 HV due to the whole austenitic microstructure.

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Tensile and Microstructural Characteristics of Fe-24Mn Steel Welds for Cryogenic Applications

Cited by 38 publications

References 33 publications

Numerical and Experimental Investigations on Residual Stress and Hardness within a Cold Forward Extruded Preform

Numerical and Experimental Investigations on Residual Stress and Hardness within a Cold Forward Extruded Preform

Gas tungsten arc weldability of stainless steel 304 using CoCrFeMnNi filler metals for cryogenic applications

Study on the Novel High Manganese Austenitic Steel Welded Joints by Arc Welding for Cryogenic Applications of LNG Tanks

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