Study on effect of double austenitization treatment on fracture morphology tensile tested nuclear grade P92 steel

Pandey, Chandan; Mahapatra, Manas Mohan; Kumar, Pradeep; Kumar, Prakash; Saini, Nitin; Thakare, J.G.; Kumar, Sanjay

doi:10.1016/j.engfailanal.2018.09.036

Cited by 75 publications

(24 citation statements)

References 31 publications

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“…is then suggests a ductile failure of the unprocessed FSWed and e unprocessed FSWed joint dimples were found to be about 4.90 to 17.72 μm, and the friction stir-processed GTAWed joint ones were found to be ranging from 3.33 to 15.59 μm. e same ductile behaviour was obtained where the dimple of the fracture is obvious without the phenomenon of intergranular fracture [35,[68][69][70].…”

Section: Fracture Surface Morphologysupporting

confidence: 71%

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

Mabuwa

Msomi

2019

Advances in Materials Science and Engineering

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This paper presents the analysis of the friction stir-processed aluminium alloy 5083-H111 gas tungsten arc-welded and friction stir-welded joints. The comparative analysis was performed on the processed and unprocessed gas tungsten arc-welded and friction stir-welded joints of similar aluminium alloy 5083-H111. The results showed a clear distinction between the friction stir processed joints and unprocessed joints. There is a good correlation observed between the microstructural results and the tensile results. Ultrafine grain sizes of 4.62 μm and 7.177 μm were observed on the microstructure of the friction stir-processed friction stir-welded and gas tungsten arc-welded joints. The ultimate tensile strength for friction stir-welded and gas tungsten arc-welded before friction stir processing was 153.75 and 262.083 MPa, respectively. The ultimate tensile strength for friction stir processed friction stir-welded joint was 303.153 MPa and gas tungsten arc-welded joints one was 249.917 MPa. The microhardness values for the unprocessed friction stir-welded and gas tungsten arc-welded joints were both approximately 87 HV, while those of the friction stir-processed ones were 86.5 and 86 HV, respectively. The application of friction stir processing transformed the gas tungsten arc morphology from brittle to ductile dimples and reduced the ductile dimple size of the unprocessed friction stir-welded joints from the range of 4.90–38.33 μm to 3.35–15.59 μm.

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Section: Fracture Surface Morphologysupporting

confidence: 71%

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

Mabuwa

Msomi

2019

Advances in Materials Science and Engineering

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“…As indicated by EDX analysis (Figure 3c), thermal aging led to additional precipitation of Fe 2 (W,Mo) Laves phase and its rapid coarsening ( Figure 3d). The results of microstructure and phase analyses are in agreement with the results of other studies about Grade 92 tempered martensitic steels published previously [31][32][33][34][35][36].…”

Section: Mechanical Propertiessupporting

confidence: 91%

The Effects of Electrochemical Hydrogen Charging on Room-Temperature Tensile Properties of T92/TP316H Dissimilar Weldments in Quenched-and-Tempered and Thermally-Aged Conditions

Ševc

Falat

Čiripová

et al. 2019

Metals

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The influence of isothermal aging at 620 °C in combination with subsequent electrochemical hydrogen charging at room-temperature was studied on quenched-and-tempered T92/TP316H martensitic/austenitic weldments in terms of their room-temperature tensile properties and fracture behavior. Hydrogen charging of the weldments did not significantly affect their strength properties; however, it resulted in considerable deterioration of their plastic properties along with significant impact on their fracture characteristics and failure localization. The hydrogen embrittlement plays a dominant role in degradation of the plastic properties of the weldments already in their initial material state, i.e., before thermal aging. After thermal aging and subsequent hydrogen charging, mutual superposition of thermal and hydrogen embrittlement phenomena had led to clearly observable effects on the welds deformation and fracture processes. The measure of hydrogen embrittlement was clearly lowered for thermally aged material state, since the contribution of thermal embrittlement to overall degradation of the weldments has dominated. The majority of failures of the weldments after hydrogen charging occurred in the vicinity of T92 BM/Ni weld metal (WM) fusion zone; mostly along the Type-II boundary in Ni-based weld metal. Thus, regardless of aging exposure, the most critical failure regions of the investigated weldments after hydrogen charging and tensile straining at room temperature are the T92 BM/Ni WM fusion boundary and Type-II boundary acting like preferential microstructural sites for hydrogen embrittling effects accumulation.

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“…The ruptured region revealed the presence of more ductile dimples, ductile tearing ridges, and lesser cleavage facets which are primarily attributed to the ductile mode of failure. 12,48,49 The coalescence of microvoids in the ruptured region causes the development of ductile dimple tearing. The ductile dimples shown on fractured surfaces are heterogeneous in size for both GTA and PCGTA weldment.…”

Section: Resultsmentioning

confidence: 99%

“…The surface where the low energy failures occur through cleavage plane (low-index crystallographic plane) is known as cleavage facets. 48,49 The majority of ductile tearing ridges, ductile dimples, and very fewer cleavage facets are prime the ductile type of fracture in both the GTA and PCGTA weldment. Further, EDS analysis performed on the tensile fractured samples is shown in Figure 13(i) and (ii).…”

Section: Microhardness Testmentioning

confidence: 99%

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Munusamy

Manikandan

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.

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Study on effect of double austenitization treatment on fracture morphology tensile tested nuclear grade P92 steel

Cited by 75 publications

References 31 publications

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

The Effects of Electrochemical Hydrogen Charging on Room-Temperature Tensile Properties of T92/TP316H Dissimilar Weldments in Quenched-and-Tempered and Thermally-Aged Conditions

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

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