Effect of optimal weld parameters in the microstructure and mechanical properties of autogeneous gas tungsten arc weldments of super-duplex stainless steel UNS S32750

Ramkumar, K. Devendranath; Mishra, Debidutta; Raj, Baldev; Vignesh, M.; Thiruvengatam, G.; Sudharshan, S.P.; Arivazhagan, N.; Sivashanmugam, N.; Rabel, Arul Maximus

doi:10.1016/j.matdes.2014.10.084

Cited by 72 publications

(28 citation statements)

References 14 publications

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“…In the study of Cr 2 N, the quantity of Cr 2 N increased with a decrease in the cooling rate [22]. Observations of microstructural change by heat treatment simulation with three kinds of welding consumables [23] and studies of the welding condition effect were conducted [24,25]. Nitrogen loss during autogenous multiple welds was observed [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Sung

Kang

2017

Metals

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The importance of the additional growth and/or transformation of the austenite phase that occurs in weld metals of super duplex stainless steel upon reheating is known. However, the effects have not been fully investigated, especially with respect to reheating induced by weaving during single-pass welding. In this work, bead-on-pipe gas tungsten arc welding (GTAW) was conducted on super duplex stainless steel to understand the effect of weaving on the microstructure of weld metal. Microstructural analysis, electron backscatter diffraction (EBSD), and focused ion beam transmission electron microscopy (FIB-TEM) were carried out to investigate the relationship between weaving and microstructural change. The weaving of GTAW produced a dynamic reheated area just before the weld bead during welding. It was revealed that extensive reheated weld existed even after one welding pass, and that the content of the austenite phase in the reheated area was higher than that in the non-reheated area, indicating the existence of a large quantity of intragranular austenite phase. In addition, the Cr 2 N content in the reheated area was lower than that in the non-reheated area. This reduction of Cr 2 N was closely related to the reheating resulting from weaving. TEM analysis revealed that Cr 2 N in the non-reheated area was dispersed following heating and transformed to secondary austenite.

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Section: Introductionmentioning

confidence: 99%

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Sung

Kang

2017

Metals

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“…where HI is the heat input (J/mm), I-current (A), V represents voltage (V), and S is the welding speed (mm/s), and η is the arc efficiency [22].…”

Section: Resultsmentioning

confidence: 99%

“…on the bead on plate trials. The intervals for the abovementioned parameters were selected from the previous work experience and literature [22,23]. Based on this design, BoP trials were conducted on 2-mm sheet as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Experimental and numerical studies on gas tungsten arc welding of Ti–6Al–4V tailor-welded blank

Karpagaraj

Kumar

Thiyaneshwaran

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The effect of gas tungsten arc welding (GTAW) process parameters and its impact on the titanium TWB was studied experimentally as well as using numerical simulation. Bead characteristics of BoP trials (bead on plate) were analyzed based on Taguchi L 27 orthogonal array by taking welding current (115 A, 125 A, 135 A), welding speed (4.1 mm/s, 5.8 mm/s, 7.5 mm/s) and arc length (3 mm, 4 mm, 5 mm) as process parameters. The bead width and depth of penetration for all trials were measured by using the weld expert system. Based on the bead characteristics, optimized GTAW process parameters (135 A, 4.1 mm/s and 3 mm) were identified for making the TWB by joining 2-1.6-mm-thick Ti-6Al-4V sheets. The tensile test of the prepared Ti-6Al-4V TWB was conducted in the universal testing machine. The COMSOL and ABAQUS software packages were used for the numerical simulation of TWB to assess the bead profile and tensile properties. The prediction made from the temperature distribution curve related to phase change near weld zone, exactly matched with the experimental work. The joint strength of TWB observed to be around 982 MPa and 1005 MPa was evaluated experimentally and conducting ABAQUS simulation work. The tensile test results were comparable with each other within the acceptable error level.

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“…A total of 8 passes were conducted in the GTAW process (weld root: 1 pass, weld filler: 5 passes, and weld cap: 2 passes). The recommended welding interpass temperature is <150 • C (Leif, 2012; Ramkumar et al, 2015). The heat input can be calculated using the following formula:…”

Section: Materials and Welding Proceduresmentioning

confidence: 99%

Microstructure and Corrosion Studies on Different Zones of Super Duplex Stainless Steel UNS S32750 Weldment

et al. 2020

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The influences of microstructure and elemental distribution on pitting corrosion resistance and passive film in different regions of a super duplex stainless steel welded joint were investigated. The banded microstructure disappeared after welding and transformed to the coarse equiaxed ferrite grains in the heat-affected zone. Three types of austenitic microstructure formed in the weld center, only two types occurred in the weld cap and weld root. It is found that the elements Ni and N were enriched in austenite, while Cr and Mo were concentrated in the ferrite. The Cr 2 N was found precipitating in some specific regions with a lower austenite content, which led to the relatively poorer resistance to pitting corrosion in the heat-affected zone, weld root, and weld cap. The ferrite observed in each studied region of the joint was prone to experiencing selective corrosion due to its lower pitting resistance equivalent number. The content of Cr in the region around the Cr 2 N disappeared, so that Cr-depletion was formed as the original location of pitting. The electrochemical impedance spectroscopy results also showed that no difference exists in the passive film structure in all of the regions of the joint, and regular banded microstructure was helpful to the passive film.

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Effect of optimal weld parameters in the microstructure and mechanical properties of autogeneous gas tungsten arc weldments of super-duplex stainless steel UNS S32750

Cited by 72 publications

References 14 publications

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Experimental and numerical studies on gas tungsten arc welding of Ti–6Al–4V tailor-welded blank

Microstructure and Corrosion Studies on Different Zones of Super Duplex Stainless Steel UNS S32750 Weldment

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