Investigations on the microstructure and mechanical properties of multi-pass PCGTA welding of super-duplex stainless steel

Mishra, Debidutta; Thiruvengatam, G.; Sudharsan, S.; Mohan, Tadikonda Harsha; Saxena, Vimal; Pandey, Rakesh K.; Arivazhagan, N.

doi:10.1007/s12034-015-0915-y

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…The TEM graph and corresponding diffraction pattern of the nitrides revealed the rod-like chromium nitride Cr 2 N, as shown in Figure 9 . Either chromium nitride or γ 2 suppresses the corrosion resistance of DSSs, but γ 2 can improve the toughness of weld joints while chromium nitrides are harmful to the toughness [ 27 , 29 , 30 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure, Pitting Corrosion Resistance and Impact Toughness of Duplex Stainless Steel Underwater Dry Hyperbaric Flux-Cored Arc Welds

Shi

Shen

et al. 2017

Materials

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Duplex stainless steel multi-pass welds were made at 0.15 MPa, 0.45 MPa, and 0.75 MPa pressure, simulating underwater dry hyperbaric welding by the flux-cored arc welding (FCAW) method, with welds of normal pressure as a benchmark. The purpose of this work was to estimate the effect of ambient pressure on the microstructure, pitting corrosion resistance and impact toughness of the weld metal. The microstructure measurement revealed that the ferrite content in the weld metal made at 0.45 MPa is the lowest, followed by that of 0.75 MPa and 0.15 MPa. The analysis of potentiodynamic polarization tests at 30 °C and 50 °C demonstrated that the pitting corrosion resistance depends on the phases of the lower pitting resistance equivalent numbers (PREN), secondary austenite and ferrite. The weld metal made at 0.45 MPa had the best resistance to pitting corrosion at 30 °C and 50 °C with the highest PRENs of secondary austenite and ferrite. The weld metal made at 0.15 MPa displayed the lowest pitting corrosion resistance at 30 °C with the lowest PREN of secondary austenite, while the weld metal made at 0.75 MPa was the most seriously eroded after being tested at 50 °C for the lowest PREN of ferrite, with large cluster pits seen in ferrite at 50 °C. The impact tests displayed a typical ductile-brittle transition because of the body-centered cubic (BCC) structure of the ferrite when the test temperature was lowered. All the weld metals met the required value of 34 J at −40 °C according to the ASTM A923. The highest ferrite content corresponded to the worst impact toughness, but the highest toughness value did not correspond to the greatest austenite content. With the decreasing of the test temperature, the drop value of absorbed energy was correlated to the ferrite content. Additionally, in this work, the weld metal made at 0.45 MPa had the best combined properties of pitting resistance and impact toughness.

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Section: Resultsmentioning

confidence: 99%

Microstructure, Pitting Corrosion Resistance and Impact Toughness of Duplex Stainless Steel Underwater Dry Hyperbaric Flux-Cored Arc Welds

Shi

Shen

et al. 2017

Materials

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“…These studies showed an increasing in the weld depth without affecting the mechanical properties of the specimens [30,31]. Other studies were dedicated to microstructure and mechanical properties [32][33]. In this work, 13 oxides were investigated on 316L austenitic stainless steel.…”

Section: Introductionmentioning

confidence: 98%

Mixing Design for ATIG Morphology and Microstructure Study of 316L Stainless Steel

Touileb

Hedhibi

Djoudjou

et al. 2019

Eng. Technol. Appl. Sci. Res.

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This work is a study of the effects of oxides combination on the morphology of 316L stainless steel welds. A series of thirteen weld lines were carried out using thirteen different oxides. Based on the depth and ratio D/W results, three candidate oxides were selected: Ti2O, Mn2O3, and SiO2. Mixing method available in Minitab 17 software is the most appropriate method to find the optimal combinations to get the best depth and D/W ratio. According to simplex lattice degree four, nineteen combinations of these oxides were prepared. The results show that the optimal composition of flux was: 66%SiO2-34% Mn2O3. The depth and D/W ratio increased to 8.85mm and 0.98 respectively for optimal ATIG, whereas for the conventional TIG welding, the depth and the ratio D/W didn't exceed 1.65mm and 0.17 respectively. For TIG weld joint the hardness is about 47 HRA and it increases to 77 HRA for the optimal ATIG weld joint. The absorbed energies in Charpy impact test are 146 and 138kJ in the weld zone and in the heat affected zone respectively for the TIG welding and they dropped to 111 and 74kJ for the optimal ATIG welding. The fracture surface examined by scanning electron microscope (SEM) shows a ductile fracture for TIG weld with small dimples but ductile-brittle fracture for ATIG weld. Energy dispersive spectroscopy (EDS/SEM) analysis shows the formation of FeS2 and SiO2 in the weld zone causing low absorbed energy for ATIG weld.

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“…The calculated sigma phase volume percentages from cooling rates of 4 °C/s, 2.5 °C/s, and 1 °C/s exhibited excellent agreement with the physical simulator experimental results using these cooling rates. The microstructure behaviors and mechanical characteristics of SDSS after the multi-pass PCGTA joining process were analyzed by Ramkumar et al 15 It was reported that with the matching filler wire in comparison to the over-alloyed filler the high and enhanced properties for weld samples will be obtained. Santos et al 16 studied the microstructure variation and mechanical characteristics of DSS and SDSS during the friction stir welding process.…”

Section: Introductionmentioning

confidence: 99%

A comparison of microstructure and mechanical characteristics correlation of the joint specimens for duplex stainless steel UNS S32304 and super-duplex stainless steel UNS S32750: The role of post-weld heat treatment

Tahaei,

Vanani,

Abbasi

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present investigation studies the impact of post-weld heat treatment (PWHT) on the microstructure and mechanical characteristics of joints made by gas tungsten arc welding between duplex stainless steel and super-duplex stainless steel specimens. The PWHT process was considered at 1100 °C for 10 minutes followed by water quenching on UNS S32304 and UNS S32750 materials. Scanning electron microscopy, optical microscopy, X-ray diffractometry (XRD), and energy dispersive X-ray analyses have been applied in microstructure evolution, including recognizing local chemical contents and elemental distribution. To analyze the mechanical characteristics of samples, tensile and hardness tests were performed. It was shown that after applying PWHT, the morphology of the austenite varied becoming mostly intergranular/spheroidal in shape, accompanied by an improvement in the percentages of austenite. This investigation indicates the PWHT results in restoring an equal percentage of both phases. The phase percentages, based on both ASTM E1245 and ASTM E562, show a good agreement between the austenite and ferrite phases of weld materials. According to XRD, the phases are mainly ferrite and austenite with different lattice parameters with no evidence of unwanted intermetallic phases. It was concluded that the PWHT process plays a crucial role in the ductility of joint specimens due to the phase balance between austenite and ferrite.

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Investigations on the microstructure and mechanical properties of multi-pass PCGTA welding of super-duplex stainless steel

Cited by 9 publications

References 9 publications

Microstructure, Pitting Corrosion Resistance and Impact Toughness of Duplex Stainless Steel Underwater Dry Hyperbaric Flux-Cored Arc Welds

Microstructure, Pitting Corrosion Resistance and Impact Toughness of Duplex Stainless Steel Underwater Dry Hyperbaric Flux-Cored Arc Welds

Mixing Design for ATIG Morphology and Microstructure Study of 316L Stainless Steel

A comparison of microstructure and mechanical characteristics correlation of the joint specimens for duplex stainless steel UNS S32304 and super-duplex stainless steel UNS S32750: The role of post-weld heat treatment

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