Microstructural and Mechanical Studies of T91/T22 Welded Joints

Mittal, Renu; Sidhu, Buta Singh

doi:10.1007/s12666-018-1332-x

Cited by 6 publications

(11 citation statements)

References 18 publications

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“…Most of the engineering materials fracture majorly in the mixed mode because of the lack of ideal condition in the service environment. 3,25 This holds true for the high temperature materials as well. The size of dimples on the welds made with laboratory developed electrode is greater as compared the commercial electrodes.…”

Section: Resultsmentioning

confidence: 85%

“…The tensile strength obtained in the case of electrodes C2 was higher than the P22 base and closer to the base metal P91, which is in agreement with the results proposed in previous literature. 7,25 The mechanical properties of the welds depend upon its microstructure of the weld and chemical composition. Materials used in high-temperature applications require good ductility and tensile properties.…”

Section: Resultsmentioning

confidence: 99%

“…So, the PWHT was performed when martensitic steel (P91) in use to relieve the stress and residual stress after welding. 23–25 The authors investigated dissimilar welds of P22-P91 steels using different fillers and also investigates their microstructure and mechanical properties. It was found that carbon migration is unavoidable in the dissimilar welds, but it can be reduced to a significant extent when nickel-based fillers were used.…”

Section: Introductionmentioning

confidence: 99%

“…In these studies, authors performed experimentations to observe the effect of various fillers and the effect of PWHT on the performance of these joints. 1,3,6,9,23–25 Literature available on the development of suitable welding consumables to weld low alloy steels is significantly limited and not available in the public domain. Therefore, this investigation is an attempt to provide an alternative solution to the commercially available electrodes, which are used to fabricate the P22/P91 dissimilar joint.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental investigations on P22/P91 dissimilar shielded metal arc welds for power plant applications

Mahajan

Chhibber

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This article deals with the development of shielded metal arc welding electrodes for P22/P91 welds. A comparison has also been drawn with commercially available electrodes. P22 low alloy steel matching electrodes developed in the laboratory using a mixture design approach was employed to fabricate the dissimilar weld. Experimentations were performed to evaluate the microstructure and mechanical properties of microhardness, tensile strength, and impact energy of the welds. The impact strength was found to improve by 19% for a laboratory developed electrode made welds as compared to the commercial electrodes. The weld chemistry investigations indicate that the weld fabricated with laboratory-developed electrodes have a higher amount of chromium and molybdenum. These elements are known to enhance the corrosion resistance of joint, thereby imparting enhanced structural integrity in high temperature operating conditions. The electrodes designed and developed in this work are found to enhance the properties of P22/P91 joint much better as compared to that with the commercial electrodes.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigations on P22/P91 dissimilar shielded metal arc welds for power plant applications

Mahajan

Chhibber

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…This could cause a concern during welding and post weld heat treatment (PWHT) in which soft zone and hard zone could occur at the weld interface in Heat Affected Zone (HAZ) and weld metal, respectively. Many researchers studied microstructures of the soft zone [4][5][6][7][8][9][10][11][12] as well as performed mechanical characterization in dissimilar metal weldments [4,[8][9][10][11][12][13][14][15][16]. In as-welded condition, martensite structure was found in heataffected zone (HAZ).…”

Section: Introductionmentioning

confidence: 99%

In-situ Observation of Martensite Decomposition in HAZ of Cr-Mo Steel Weldment

Phung-On¹,

Khetsoongnoen²,

Srithorn³

et al. 2019

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In-situ observation of martensite decomposition at Heat Affected Zone (HAZ) was investigated on a dissimilar joining between 2.25Cr-0.5Mo grade T22 as base material and ER90S-B9 as filler metal using GTAW process using LEEM at a synchrotron facility. A post weld heat treatment (PWHT) cycle was simulated on a welded specimen in high vacuum chamber by heating cartridge and electron bombardment. Both effects PWHT duration and weld areas were studied for comparisons. At the simulated PWHT between 690°C -700°C in CGHAZ, martensite started to decompose by the dissolution of carbide flakes. The prior-austenite grain boundaries were also shown during the process. The same phenomena were also observed in FGHAZ with different extent. In un-affected base material, ferrite and new pearlite grains presented and grew at the expense of old pearlite. Longer PWHT duration resulted in more ferrite formed in all weld areas. Raising PWHT temperature to 730°C could push the reaction above Eutectoid temperature as the new austenite formed at grain boundaries. The proposed mechanism for martensite decomposition would be in steps as dissolution of carbide followed by formation of ferrite and growth as PWHT proceeded.

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Systematic oxidation studies of dissimilar ferritic/austenitic welded joints

Mittal¹,

Sidhu

2021

Materials at High Temperatures

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Microstructural and Mechanical Studies of T91/T22 Welded Joints

Cited by 6 publications

References 18 publications

Experimental investigations on P22/P91 dissimilar shielded metal arc welds for power plant applications

Experimental investigations on P22/P91 dissimilar shielded metal arc welds for power plant applications

In-situ Observation of Martensite Decomposition in HAZ of Cr-Mo Steel Weldment

Systematic oxidation studies of dissimilar ferritic/austenitic welded joints

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