Development of high-strength welding consumables using calculations and microstructural characterisation

Holly, Sylvia; Haslberger, Phillip; Zügner, Dominik; Schnitzer, Ronald; Kozeschnik, Ernst

doi:10.1007/s40194-018-0562-1

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…Particularmente, uma composição com a adição de 2,0Mn-3,0Ni-0,5Cr tem sido indicada para este propósito [22,28]. Embora, o elemento Cr seja nocivo para a tenacidade, a sua adição é usual para que se obter os níveis de resistência desejados [48].…”

Section: Propriedades Mecânicasunclassified

Desempenho de metal de solda adequado para soldagem de componentes de ancoragem

et al. 2020

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RESUMO O presente trabalho apresenta os resultados de um programa de pesquisa cujo objetivo principal é o desenvolvimento de consumíveis adequados para a soldagem de componentes de ancoragem fabricados em aços de alta resistência. Após avaliação de diferentes composições químicas, com base no balanço de Mn e Ni é feita uma análise detalhada das propriedades mecânicas e microestruturais da composição química que propiciou os melhores resultados para permitir uma conclusão decisiva. Foram soldadas juntas pelo processo eletrodo revestido utilizando consumíveis de 4,0 mm de diâmetro, com preaquecimento de 200 ºC, corrente contínua, posição plana e energia de soldagem nominal de 1,5 kJ / mm. Após a soldagem, foram realizados ensaios mecânicos (tensão, impacto Charpy-V, dureza) e metalográficos por microscopia ótica, microscopia eletrônica de varredura e EBSD em amostras removidas integralmente do metal de solda, tanto na condição de como soldado quanto após tratamento térmico pós-soldagem (TTPS) realizado a 600 ºC. Os resultados mostram que os metais de solda obtiveram propriedades mecânicas satisfatórias após o TTPS, sendo adequados para aplicação em componentes de ancoragem de acordo com a especificação IACS W22. Além disso, observou-se que a tenacidade ao impacto experimentou uma melhoria com o aumento do tempo de TTPS, o que é crucial para componentes com maiores espessuras.

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Section: Propriedades Mecânicasunclassified

Desempenho de metal de solda adequado para soldagem de componentes de ancoragem

et al. 2020

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“…However, weld metal K has a higher Cr content (Table 3), which results in high strength. Although a certain Cr content is necessary for strength, an accurate balance between strength and toughness remains necessary because adding Cr is beneficial to mechanical strength but deleterious to impact toughness [48].…”

Section: Influence Of Chemical Compositionmentioning

confidence: 99%

“…12 Influence of PWHT on the Charpy-V test results Fig. 13 Effect of chromium on the properties of high strength steel weld metals [3,5,8,12,13,31,[47][48][49][50][51][52][53]. (a) Mechanical strength, (b) impact toughness primary concern for the development of welding consumables [58].…”

Section: Practical Aspectsmentioning

confidence: 99%

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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“…While ensuring the high strength of the deposited metals, to avoid brittlefracture at low temperatures, the deposited metals should have adequate toughness. Therefore, to obtain an excellent balance between the strength and toughness of engineering materials at low temperatures, the choice of a suitable composition design and optimized welding parameters are very important [1][2][3][4][5]. Under the condition that the welding consumables are determined, the performance of deposited metal mainly depends on the welding process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Microstructure and Mechanical Properties of Deposited Metal of E120C-K4 High Strength Steel Flux-Cored Wire

Zhang

Chen

et al. 2023

Materials

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The effect of different heat inputs of 1.45 kJ/mm, 1.78 kJ/mm and 2.31 kJ/mm on the microstructure and mechanical properties of deposited metals of the self-developed AWS A5.28 E120C-K4 high strength steel flux-cored wire was studied by optical microscope, scanning electron microscope and mechanical property test. With the increase in heat input, the results showed that the microstructure of deposited metals became coarse. Acicular ferrite increased at first and then decreased, granular bainite increased and degenerated upper bainite and martensite decreased slightly. Under the low heat input of 1.45 kJ/mm, the cooling rate was fast and the element diffusion was uneven, which caused composition segregation and easy to form large size inclusions SiO2-TiC-CeAlO3 with weak binding to the matrix. Under the middle heat input of 1.78 kJ/mm, the composite rare earth inclusions in dimples were mainly TiC-CeAlO3. The dimples were small and uniformly distributed, and the dimple fracture mainly depended on the wall-breaking connection between medium-sized dimples rather than an intermediate media. Under the high heat input of 2.31 kJ/mm, SiO2 was easy to adhere to high melting point Al2O3 oxides to form irregular composite inclusions. Such irregular inclusions do not need to absorb too much energy to form necking. Finally, the integrated effects of microstructure and inclusions resulted in the optimum mechanical properties of deposited metals with a heat input of 1.78 kJ/mm, which was a tensile strength of 793 MPa and an average impact toughness at −40 °C of 56 J.

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Development of high-strength welding consumables using calculations and microstructural characterisation

Cited by 13 publications

References 16 publications

Desempenho de metal de solda adequado para soldagem de componentes de ancoragem

Desempenho de metal de solda adequado para soldagem de componentes de ancoragem

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

Effect of Heat Input on Microstructure and Mechanical Properties of Deposited Metal of E120C-K4 High Strength Steel Flux-Cored Wire

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