Effect of post-weld heat treatment on the tensile strength of laser beam welded Hastelloy C-276 sheets at different heat inputs

Bal, Kalinga Simant; Majumdar, Jyotsna Dutta; Choudhury, Asimava Roy

doi:10.1016/j.jmapro.2018.12.019

Cited by 44 publications

(11 citation statements)

References 25 publications

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“…The backscattered electron (BSE) mode scanning electron images of the core of the weld zone of the as-welded and the PWHTed joints are presented in Figure 4. As revealed in Figure 4(a), the weld zone of the as-welded joint was characterized with sub-granular grain structure and formation of two distinct phases which are: 1 grey-contrast continuous matrix; and 2 white contrast precipitates at the grain boundaries Based on their white colour contrast and angular shape, the precipitates were adjudged to be secondary carbides (Bal et al, 2019;Ghorbani et al, 2017). To confirm this, EDX analysis was conducted on the phases.…”

Section: Resultsmentioning

confidence: 86%

“…Other researchers in this area have also identified the precipitation of chromium carbides in the welded joint of stainless steels as a major cause of extremely high hardness in the heat affected zone (HAZ) and welded joint. This eventually resulted in high brittleness and poor fracture toughness of the weldment (Bal et al, 2019;Sérgio et al, 2014). In addition, corrosion damage is more severe at the joint because of the presence of different compounds (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

Abioye

Omotehinse

Oladele

et al. 2020

WJE

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Purpose The purpose of this study is to determine the effects of post-annealing and post-tempering processes on the microstructure, mechanical properties and corrosion resistance of the AISI 304 stainless steel gas metal arc weldment. Design/methodology/approach Gas metal arc welding of AISI 304 stainless steel was carried out at an optimized processing condition. Thereafter, post-annealing and post-tempering processes were performed on the weldment. The microstructure, mechanical and electrochemical corrosion properties of the post-weld heat treated samples, as compared with the as-welded, were investigated. Findings The as-welded joint was characterized with sub-granular grain structure, martensite formation and Cr-rich carbides precipitates. This made it harder than the post-annealed and post-tempered joints. Because of slower cooling in the furnace, the post-annealed joint contained Cr-rich carbides precipitates. However, the microstructure of the post-tempered joint is more refined and significantly devoid of the carbide precipitates. Post-tempering process improved the elongation (∼23%), tensile (∼10%) and impact (∼31%) strengths of the gas metal arc AISI 304 stainless steel weldment, while post-annealing process improved the elongation (∼20%) and impact strength (∼72%). Owing to the refined grain structure and significant elimination of the Cr-rich carbide precipitates at the joint, the post-tempered joint exhibited better corrosion resistance in 3.5 Wt.% NaCl solution than the post-annealed and the as-welded joints. Originality/value The appropriate post-weld heat treatment that enhances microstructural homogeneity and quality of the AISI 304 gas metal arc welded joint was determined.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

Abioye

Omotehinse

Oladele

et al. 2020

WJE

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“…Hence, the study of post welding heat treatment on the microstructure and mechanical properties of the SS 316L sheets is also important for its useful application. Some researchers reported the effect of post welding heat treatment on mechanical and microstructural properties of austenitic, martensitic and duplex strain less steel welds [17][18][19][20][21][22][23][24][25][26][27]. Kose and Kacar [17] studied the effects of pre-and postwelding heat treatments on the microstructure and mechanical properties of CO2 laser welded AISI 420 weldments.…”

Section: Introductionmentioning

confidence: 99%

Effect of post welding heat treatment on the weld quality of micro plasma arc welded SS-316L thin sheet

2022

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High thermal gradient formed during the fusion welding process results in development of undesirable residual stress in the weldments. This stress is developed due to restraint by the parent metal during weld solidification. The high heat input results in non-uniform heat distribution across the weld region in other words non-uniform microstructural development across the weld region and hence the mechanical properties of the joint are often not uniform. In order to avoid inhomogeneity in the mechanical properties and also to reduce/eliminate undesirable residual stress, the welded samples are given post welding heat treatment. In this research, 500 µm thin SS-316L sheets are welded using micro plasma arc welding process and then the welded specimens are heat treated. The welding experiments are conducted by varying welding speed, welding current and stand-off distance. Weld bead microstructure, microhardness, ultimate tensile strength (UTS), yield strength and percentage elongation are determined before and after heat treatment. The effects of welding heat input and process parameters on the measured weld qualities are studied. Analysis of variance is also performed to estimate the influence of factors and their interaction on the weld quality. The post weld heat treatment results in an increase in the grain size of the HAZ and is found in the range of 38.96 µm to 56.22 µm whereas for as-welded samples it is in the range of 29.88 µm to 50.40 µm. The average UTS value of the heat treated samples is increased by 9.9% compared to the as-welded samples. The hardness of the fusion zone varies in the range of 175-215 HV.

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“…The comparison of the yield strength is considered before and after laser peening. The improved mechanical strength of the laser beam weldments of Hastelloy C-276 has observed by using the postweld heat treatment with different heating and cooling cycles [15][16][17]. The authors extensively studied microstructure and mechanical properties concerning heat input based on the reported literature, further, to improve the strength of the weldments using post welded heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Distortion Control for Dissimilar Welding of SS321 to Hastelloy C-276 with CO2 Laser Beam Butt Joints Using Taguchi Methods

Naidu¹,

Jajimoggala²

2021

MMEP

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The laser beam welding process is a promising technology because of its reliability and ability to automate the process easily. This study aims to analyze distortion for dissimilar laser weld joints. Hastelloy C276 and SS321 plates are joined by using the CO2 Laser beam welding. Welding current, welding speed and shielding gas flow are chosen as process parameters for preparing butt joints. Each of the factors has two levels to control the parameters of the output. Experimentation was conducted with four trails by using an L4 orthogonal array. The quality of the welds and bead geometry are verified through macrostructure examination. The Vernier height gauge was used for the measurement of distortion in the weldments. Lower the better-quality characteristic is chosen for the response. ANOVA studies identified laser power at 81%, the weld speed at 16% parameters is a contribution with a statistical of about 95%. Full penetration was observed for all the experimental trails.

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Effect of post-weld heat treatment on the tensile strength of laser beam welded Hastelloy C-276 sheets at different heat inputs

Cited by 44 publications

References 25 publications

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

Effect of post welding heat treatment on the weld quality of micro plasma arc welded SS-316L thin sheet

Distortion Control for Dissimilar Welding of SS321 to Hastelloy C-276 with CO2 Laser Beam Butt Joints Using Taguchi Methods

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