Influence of deep cryogenic treatment on the microstructure and properties of AISI304 austenitic stainless steel A-TIG weld

Cai, Yangchuan; Luo, Zhen; Zeng, Yanan

doi:10.1080/13621718.2016.1222256

Cited by 22 publications

(9 citation statements)

References 16 publications

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“…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. Table 8 and Fig.…”

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 authors [27] have claimed that the grain size of the weld zone was decreased to a certain degree after DCT. In addition, Barron [28] has also claimed that the improvement of wear resistance after DCT presented some relationship to grain refinement besides the retained austenite transformation.…”

Section: Resultsmentioning

confidence: 99%

Carbides precipitation and kinetics of H13 steel subjected to deep cryogenic treatment

Guo

et al. 2022

Materials Science and Technology

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The influence of deep cryogenic treatment (DCT) on carbides precipitation and isothermal softening behaviour as a function of both temperature and time during tempering of H13 steel was investigated. The results show that the retained austenite transformed into martensite leading to an increase in hardness. The carbon content of martensite decreased after DCT and tempering according to the calculation of the X-ray diffraction spectrum. This indicates that more fine carbides precipitated from the martensitic matrix after DCT. The morphology of microstructure and distribution of carbides have verified the properties improvement mainly depending on the retained austenite transformation and more fine carbides precipitated after tempering. In addition, the carbides precipitating and coarsening are the main causes of thermal softening.

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“…At a slower cooling rate, it continuously dissolves TiN when cooled below 1300 • C [16]. The carbide dissolution temperature of Cr 7 C 3 is about 1890 • C, and the precipitation morphology depends on its nucleation and growth behavior at different cooling rates [19]. At 300 kJ/cm heat input, Ti (C, N) particles easily dissolve due to the slow cooling rate in the high-temperature stage, hence no Ti (C, N) particles are observed in TEM, and the second phase shows the Cr carbide.…”

Section: Second Phase In Welding Heat Affected Zonementioning

confidence: 99%

“…Simultaneously, the fine Cr carbides grow up at elevated temperatures, which increases their average size. growth behavior at different cooling rates [19]. At 300 kJ/cm heat input, Ti (C, N) particles easily dissolve due to the slow cooling rate in the high-temperature stage, hence no Ti (C, N) particles are observed in TEM, and the second phase shows the Cr carbide.…”

Section: Second Phase In Welding Heat Affected Zonementioning

confidence: 99%

The Influence of the Second Phase on the Microstructure Evolution of the Welding Heat-Affected Zone of Q690 Steel with High Heat Input

Qi,

Pang,

et al. 2024

Materials

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Q690 steel is widely used as building steel due to its excellent performance. In this paper, the microstructure evolution of the heat-affected zone of Q690 steel under simulated high heat input welding conditions was investigated. The results show that under the heat input of 150–300 kJ/cm, the microstructures of the heat-affected zone are lath bainite and granular bainite. The content of lath bainite gradually decreased with the increase in heat input, while the content of granular bainite steadily increased. The proportion of large-angle grain boundaries decreased from 51.1% to 40.3%. Overall, the average size of original austenite increased, and the precipitates changed from Ti (C, N) to Cr carbides. During the cooling process, the nucleation position of bainitic ferrite was from high to low according to the nucleation temperature, and in order of inclusions at grain boundaries, triple junctions, intragranular inclusions, bainitic ferrite/austenite phase boundaries, twin boundaries, grain boundaries, and intragranular inclusions at the bainitic ferrite/austenite phase interface. The growth rate of bainitic ferrite nucleated at the phase interface, grain boundary, and other plane defects was faster, while it was slow at the inclusions. Moreover, it was noted that the Mg-Al-Ti-O composite inclusions promote the nucleation of lath bainitic ferrite, while the Al-Ca-O inclusions do not facilitate the nucleation of bainitic ferrite.

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Influence of deep cryogenic treatment on the microstructure and properties of AISI304 austenitic stainless steel A-TIG weld

Cited by 22 publications

References 16 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

Carbides precipitation and kinetics of H13 steel subjected to deep cryogenic treatment

The Influence of the Second Phase on the Microstructure Evolution of the Welding Heat-Affected Zone of Q690 Steel with High Heat Input

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