Sources of Variability and Lower Values in Toughness Measurements of Weld Metals

Cao, Rui; Yuan, Junjun; Xiao, Zhiyu; Ma, J. Y.; Mao, Gaojun; Zhang, X. B.; Chen, J. H.

doi:10.1007/s11665-017-2686-7

Cited by 20 publications

(4 citation statements)

References 17 publications

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“…Despite the different number of passes, the proportion of reheated weld metal at the Charpy-V notch position was similar for both welds. The parameters used in welding procedures, mainly the number of passes and the deposition sequence, exert an important effect on weld metal recrystallization and consequently on their mechanical properties [5,11,[21][22][23]. In the present work, a similar proportion of reheated regions enabled comparison of the weld metal properties.…”

Section: Resultsmentioning

confidence: 86%

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Gomes

Jorge

Bott

et al. 2019

Metallogr. Microstruct. Anal.

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The development of new filler metals for offshore industry is challenging because high strength and toughness levels are required after post-welding heat treatment (PWHT) is applied to reduce residual stresses. The higher chromium contents added to the chemical composition of welding consumables to attain the required ultimate tensile strength are usually associated with reduced toughness. This work presents a comparative analysis of the behavior of two high strength steel weld metals with different Cr-Mo and Mn-Ni additions that were submitted to PWHT. Weld metals obtained by shielded metal arc welding process were evaluated using mechanical tests (Charpy-V notch and Vickers microhardness) and microstructural analysis (scanning electron microscopy and electron backscattered diffraction) conducted in samples removed from the center line of weld deposits, both in the as-welded and heat-treated (600 °C for 1 h) conditions. Although similar results were obtained in the as-welded condition, different behaviors were observed after PWHT. While impact toughness for Cr-Mo additions was reduced by carbide precipitation, as predicted by thermo-calc simulation, weld metal based on Ni-Mn addition exhibited improvements after PWHT because the predominantly martensite microstructure was tempered. This makes the latter more appropriate for weldments submitted to PWHT.

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Section: Resultsmentioning

confidence: 86%

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Gomes

Jorge

Bott

et al. 2019

Metallogr. Microstruct. Anal.

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“…From Equation (1), it is obvious that D has a significant influence on the fracture stress ( σ f(f) ). Also, it is important to note that brittle secondary phase particles such as carbides, or defects deteriorate the fracture plastic strain ε pc [18] and, as a result, deteriorate the fracture toughness remarkably. Those two parameters, the grain size and brittle structure, play an essential role in explaining the variations in the impact results.…”

Section: Resultsmentioning

confidence: 99%

“…coarse grains) because σ f(f) is lower at the coarser grain compared with the surrounding relative finer grains. Also, the hard structure of the fracture origins of both RJ1 and RJ2 facilitated fracture since deterioration of ε pc due to carbides and hard phases makes crack nucleation easier [18]. RJ2 depicted the lowest impact results (69 J) due to the combined action of both WM coarse grain size, confirmed by microstructure in Figure 5(e) and the fractured surface in Figure 13(a), and the hard structure created by carbon migration in the vicinity of the FL.…”

Section: Resultsmentioning

confidence: 99%

Role of Nickel-141 in mitigating carbon migration and improving impact properties of thermally aged dissimilar welded joint repairs

Attalla

Kandil

Gepreel

et al. 2022

Science and Technology of Welding and Joining

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Three A387 grade 11/AISI 304 dissimilar welded joint (DWJ) repairs were prepared by manual metal arc (MMA) welding with three different composition welding electrodes: Inconel 112, Inconel 182, and Nickel-141 as a buffer layer, followed by Inconel 182 for the first, second, and third repair joints (RJs), respectively. Selected specimens were thermally aged (TA) to induce carbon migration. The microstructure was studied. Line elemental analysis across the fusion line (FL) was carried out using a scanning electron microscope (SEM)/energy-dispersive spectroscopy (EDS). Hardness and Charpy impact test (CIT) were performed. The impact specimens' fractured surfaces were analysed using SEM/EDS. Results showed that Nickel-141 has a significant influence on impeding carbon migration. More importantly, a significant increase in the impact properties has been achieved. Depression in the impact results for the conventional procedures (Inconel 112 and Inconel 182) was found to be partially due to the formation of the carbon-enriched zone (CEZ).

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“…In order to identify the relationship between impact toughness and fracture surface, four parameters of the fracture surface are defined in Refs. [33,34]. These parameters are the stretch zone width (SZW), fibrous crack length (SCL), the distance from the crack initiation site to the fibrous crack (x f ), and the distance from the crack initiation location to the original notch root (X f ).…”

Section: Fracture Surface Of the Impact Specimensmentioning

confidence: 99%

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Yan

Cao

et al. 2020

Materials

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The demand for heat-resistant steel has increased owing to its utility in numerous devices that must withstand high steam pressures and high temperatures, such as turbine rotors and blades in ultra-supercritical power plants. It is inevitable to join heat-resistance steel part by welding method, so it is important to maintain the toughness of the weld metals. In this study, the microstructure, low-temperature impact toughness, and fracture surface of as-welded and post-weld heat treatment (PWHT) of 2.25Cr-1Mo-0.25V weld metal were investigated. The microstructures of the as-welded and PWHT specimens are granular bainite and ferrite, respectively. This work revealed the relationship between effective microstructure nearby crack initiation origin and low temperature impact toughness for both the as-welded and PWHT specimens. The evolution of the microstructure and prior austenite was then investigated using confocal laser scanning microscopy (CLSM) to observe the formation of coarse ferrite grain structures. A suggestion for enhancing the low-temperature toughness was provided based on the effect of adjusting Mn content and forming acicular ferrite.

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Sources of Variability and Lower Values in Toughness Measurements of Weld Metals

Cited by 20 publications

References 17 publications

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Role of Nickel-141 in mitigating carbon migration and improving impact properties of thermally aged dissimilar welded joint repairs

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

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