Tensile properties and impact toughness of S30408 stainless steel and its welded joints at cryogenic temperatures

Ding, Huiming; Wu, Yue; Lu, Qunjie; Xu, Ping; Zheng, Jinyang; Wei, Lubin

doi:10.1016/j.cryogenics.2018.04.002

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…The strong bonding had resulted in leak proof joints. The leak proof joints after thermal shock test have resulted in better vacuum conditions compared to room temperature because of aforementioned low, strengthening effects and possible grain refining effects due to plastic strain [17] on the Al side due to thermal shock test from room temperature to cryogenic temperature. Cai et al [18] noted that vacuum test results were improved with improvements in strength and micro-hardness due to grain refinement caused by the cryogenic treatment.…”

Section: Vacuum and Thermal Shock Testmentioning

confidence: 99%

Pipe-to-pipe friction welding of dissimilar Al-SS joints for cryogenic applications

Vyas

Mehta

Badheka

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In the present investigation, dissimilar materials such as AA6063 and SS304L having pipe dimensions of 60.33 mm outer diameter and 3.9 mm wall thickness were friction-welded with different conditions of process parameters. Nondestructive tests such as radiography test (RT) and liquid penetration test (LPT) were carried out on the welded pipes in order to qualify weld joint. Thermal shock test and helium leak tests were performed on the successful welded samples in order to check its ability to work with cryogenic application. The results revealed that the pipe-to-pipe configuration of dissimilar Al-SS joints was produced successfully by friction welding using continuous drive. There were no defects presented in the joint area as revealed by RT and LPT. Thermal shock test and helium leak tests have also confirmed the soundness of joints. Higher deformation of Al base material results in the huge flash formation of Al that results in the sleeve formation of Al pipe on SS pipe. The helium leak test has confirmed the soundness of joints without any defects after its testing at 1.2 psi pressure. More than 60% of joint efficiency was obtained from Al-SS friction-welded joints.

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Section: Vacuum and Thermal Shock Testmentioning

confidence: 99%

Pipe-to-pipe friction welding of dissimilar Al-SS joints for cryogenic applications

Vyas

Mehta

Badheka

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…The presence of reversed austenite can alleviate stress concentration, hinder the formation and propagation of cracks and reduce crack sensitivity. In combination with Figure 7, it can be seen that the grain sizes in the once and twice repair welded joints are also significantly refined, which plays an active role in improving the strength Material toughness is determined by two main factors: the type of microstructure and the grain size of the microstructure [27]. Based on the analysis of microstructure and grain size, a large amount of fine reversed austenite is dispersed at the boundary of martensite laths in the welded joint.…”

Section: Impact Testmentioning

confidence: 74%

“…The cleavage cracks develop into cleavage planes, while part of plastic tearing is shown as tearing ribs, dimples or dimple bands. Material toughness is determined by two main factors: the type of microstructure and the grain size of the microstructure [27]. Based on the analysis of microstructure and grain size, a large amount of fine reversed austenite is dispersed at the boundary of martensite laths in the welded joint.…”

Section: Impact Testmentioning

confidence: 99%

Effect of Reversed Austenite on Mechanical Properties of ZG06Cr13Ni4Mo Repair Welded Joint

Wei

Li³

et al. 2021

Coatings

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In this work, gas tungsten arc welding (GTAW) was used to repair ZG06Cr13Ni4Mo martensitic stainless steel. Repair welding occurred either once or twice. The changes in the microstructure and properties of the repair welded joints were characterized by optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD), tensile and impact tests. The effects of reversed austenite in repair welded joints on microstructure and mechanical properties were studied. The results show that the microstructure of the welded joint after repair welding consists of a large amount of martensite (M) and a small amount of reversed austenite (A), and the reversed austenite is distributed at the boundary of martensite lath in fine strips. With the increase in the number of welding repairs, the content of reversed austenite in the welded joint increases. The microstructure in the repair welded joints is gradually refined, the microstructure in the once and twice repaired joints is 45.2% and 65.1% finer than that in the casting base metal, respectively. The reversed austenite presented in the repair welded joints decreases the tensile strength by 4.8% and 6.7%, increases the yield strength by 21.3% and 26.4%, and increases the elongation by 25% and 56%, respectively, compared with the casting base metal. In addition, the reversed austenite mainly nucleates and grows at the boundary of lath martensite. The refinement of the martensite structure was due to the generation of reversed austenite and the refinement of original austenite grain by the welding thermal cycle. After repair welding, the reverse austenite appeared in the repair welded joints and the tensile strength decreased slightly, but the plastic toughness was significantly improved, which was conducive to the subsequent service process.

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“…They showed that to obtain a desirable cryogenic tensile temperature, the effects of post-weld heat treatment on the microstructures of the friction stir welding joints should also be examined in detail. Ding and Wu et al [20] conducted a series of tensile tests and Charpy impact tests at eight distinct temperatures of 20, 0, −20, −40, −80, −120, −160, and −196 • C, to investigate the mechanical properties of S30408 base metal and welded joints at cryogenic temperatures. Their study showed that the welded joints have a higher yield stress than the base metal.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Predictions of Cryogenic Leakages in Welded Steel Plates

et al. 2023

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This study presented experimental and numerical research to investigate the effect of cryogenic leakage on a plate structure of AH36-grade steel containing welded joints. To simulate the cryogenic leakage conditions, the welded plate was exposed to a temperature of −196 °C by supplying liquid nitrogen (LN2) to the center of the steel plate. The time-dependent temperature history and strain variation were measured by using thermocouples and strain gauges attached to the plate surface. Additionally, the residual stress of the middle surface section before and after the cryogenic leakage process was measured by X-ray diffraction analysis (XRD). A three-dimensional finite element model was created with the use of a commercial finite element analysis (FEA) program to simulate the flux-cored arc welding process and cryogenic leakage process. The steel surface temperature dropped sharply and reached approximately −196 °C at 160 s after LN2 supplement. After the first 650 s of the LN2 leakage experiment, the outside of the trough reached approximately −75 °C and −25 °C, depending on the location of the thermal couples. Although there was a relative difference in the results, the experiment and numerical simulation results for temperature and stress distribution showed good agreement. The results could be utilized in the ship design stage adopting welded structures as a basic database.

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Tensile properties and impact toughness of S30408 stainless steel and its welded joints at cryogenic temperatures

Cited by 24 publications

References 31 publications

Pipe-to-pipe friction welding of dissimilar Al-SS joints for cryogenic applications

Pipe-to-pipe friction welding of dissimilar Al-SS joints for cryogenic applications

Effect of Reversed Austenite on Mechanical Properties of ZG06Cr13Ni4Mo Repair Welded Joint

Experimental and Numerical Predictions of Cryogenic Leakages in Welded Steel Plates

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