Investigation into Microstructures of Maraging Steel 250 Weldments and Effect of Post-Weld Heat Treatments

Tariq, Fatima; Baloch, Rasheed Ahmed; Ahmed, Bilal; Naz, Nausheen

doi:10.1007/s11665-009-9455-1

Cited by 45 publications

(24 citation statements)

References 9 publications

(1 reference statement)

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“…The base metal microstructures basically show the presence of regular bcc martensitic structure as described with finer grain sizes. 10 In the FZ, the transformation of austenite to martensitic structures is the primary microstructural change. The FZ consists of cellular martensitic structures with finer grain sizes, but toward the FZ boundary presence of dendritic martensitic structures is more dominant.…”

Section: Cooling Rate and Microstructurementioning

confidence: 99%

“…Laser welding is advantageous in terms of mechanical properties and very small heat-affected zone (HAZ) in this case. Tariq et al 10 investigated the multipass GTAW of maraging steel grade 250. The optimum mechanical properties have been obtained by aging treatment at 758 K for 5 h. Ramana et al 11 studied the residual stress distribution on electron-beam welding of maraging 250-grade steel.…”

Section: Introductionmentioning

confidence: 99%

“…Several fusion welding processes have been used for joining of maraging steel over a wide variation of sample thickness. [9][10][11][12][13][14][15] The metallurgical changes during the heating and subsequent cooling phase for a moving heat source (mainly the rate of cooling) are directive by the choice of welding process. Sakai et al 9 studied the feasibility of welding maraging steel using GTAW, plasma arc welding (PAW) and laser beam welding processes.…”

Section: Introductionmentioning

confidence: 99%

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On the effect of heat input in plasma microwelding of maraging steel

Saikia

Baruah

Bag

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Maraging steel in known as ultra-high strength and toughness material widely used in aerospace industry and defense system. The joining of this material by fusion welding process experiences gigantic metallurgical transformation that have significant contribution toward the development of welding distortion, and transformation of austenite into martensite at very low temperature with significant increase in specific volume. In this study, a set of bead-on-plate welding is executed at microscale to establish feasible range of process parameters using plasma arc as a source of heat. Although, high-concentrated heat does not produce much distortion, the heat input to the weld joint experiences the difference in possible distortion. A finite element–based numerical process model is also developed to investigate the differential influence of process parameters on thermo-mechanical behavior of weld joint. An inverse approach is followed to estimate the unknown input parameters by integrating the finite element model with optimization algorithm. The integrated model predicts the shape and size of weld geometry and welding distortion that are well agreed with experimental values.

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Section: Cooling Rate and Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the effect of heat input in plasma microwelding of maraging steel

Saikia

Baruah

Bag

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Os aços maraging de base quaternária NiCo-Mo-Ti conseguem aliar boa tenacidade com alta resistência mecânica. No estado solubilizado e puramente martensítico, o aço maraging apresenta-se dúctil e razoavelmente trabalhável a frio devido ao baixo teor de carbono (<0,02%) e ao alto teor de níquel [2]. Estes aços pertencem a uma família de materiais com temperatura Ms abaixo de 200ºC e, mesmo sem o tratamento térmico final do envelhecimento, tem resistência mecânica superior a dos aços carbono e baixa liga usados nestas uniões [3].…”

Section: Introductionunclassified

Investigação Metalográfica Da Zona Afetada Pelo Calor Da Estrutura Soldada De Aço Maraging Com Aisi 8630 Modificado

Nunes¹,

Vieira²,

Júnior³

et al. 2018

ABM Proceedings

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ResumoA soldagem de uniões dissimilares é muito comum em sistemas usados na exploração de petróleo e produção em águas profundas no mar. Comumente envolve soldagem de tubos de aço de baixo carbono com aços forjados baixa liga, muitas vezes, com revestimento interno de Inconel com o objetivo de reduzir o nível de tensões residuais seguidos de tratamentos térmicos de pós-soldagem. Uma técnica alternativa para reduzir as tensões residuais é utilizar um eletrodo que, durante o processo de resfriamento passa por uma transformação martensítica em uma temperatura relativamente baixa, de modo que a deformação resultante da transformação compense a contração durante o processo de resfriamento. Desta forma, o objetivo deste trabalho é avaliar o emprego do maraging como metal de solda em união dissimilar de materiais aplicadas na indústria do petróleo. Foram usados amostras de aços estruturais chanfradas em meio-v e soldadas utilizando varetas. Os níveis de tensões residuais e microestruturas da zona afetada pelo calor (ZAC) foram investigados. Uma verificação importante foi que a junta soldada apresentou tensões compressivas no metal de solda. Palavras-chave: Maraging; Soldagem; Tensão residual. METALLOGRAPHIC INVESTIGATIONS OF THE HEAT-AFFECTED ZONE IN MARAGING WITH AISI 8630 MODIFIED STEEL WELDED STRUCTURE AbstractThe welding of dissimilar joints is very common in systems used in oil exploration and production in deep waters. Commonly involves welding low carbon steel pipes with low alloy forged steel, more often, with cladding of Inconel. An alternative technique for reducing residual stresses is to use a filling material that during the cooling process undergoes a displacive transformation at a relatively low temperature so that the deformation resulting from the transformation compensates the contraction during the cooling process. Thus, the aim of this study is to evaluate the use of maraging 250 (Mar 250) as weld metal in dissimilar union of materials applied in the oil industry. It has been used samples of structural steels in mid-v and welded using welding rods. The levels of residual stress and microstructure of the heat-affected zone (HAZ) were investigated not only in the joint welded with Mar 250 but also in a joint welded with a conventional filler metal. An important result of this work is that the welded joint where the Mar250 was used presented compressive stresses in the weld metal and heat affected zone.l

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“…1,11) Gas tungsten arc welding (GTAW) associated with continuous current mode is considered to be one of the most widely used welding process to join dissimilar materials. 12,13) However, due to lower cooling rate associated with conventional GTAW process, problems such solidification cracking, microfissuring, increased micro-segregation and precipitation of intermetallic compounds may arise which lead to immense decrease in mechanical as well as corrosion resistance of such dissimilar weldments. [14][15][16][17][18][19][20] In addition, slower cooling rate associated with such conventional welding techniques also results in coarser columnar dendritic structure and acts as a favorable site for segregation of elements while solidification.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulsed Current Gas Tungsten Arc Process on the Dissimilar Weldments between Nickel-based Superalloy/Austenitic Stainless Steel

2017

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The present work aims at investigating the microstructural and mechanical properties of dissimilar welds between Superalloy C-276 and Grade 321 austenitic stainless steel sheets, fabricated by pulsed current gas tungsten arc welding. The microstructural examination was carried out using an optical microscope and scanning electron microscope (SEM) equipped with energy dispersive spectroscopy. The weld metal microstructures divulged finer equiaxed grains. SEM images revealed migrated grain boundaries adjacent to weld line on both Superalloy C-276 and Grade 321. In addition, the presence of Mo-rich phases was also observed in the weld metal and at the weld interface of Superalloy C-276, which needs further investigation. Mechanical tests were carried out with respect to microhardness, tensile and impact properties. Furthermore, the presence of finer dendritic structure and controlled distribution of elements obtained with PCGTAW contributed for higher corrosion resistance of WM compared to BMs. The results of the present study would help in obtaining high quality dissimilar joints. Moreover, Grade 321 being a low-priced material as compared to Superalloy C-276 would be an economical substitution and would facilitate in saving huge material costs.

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Investigation into Microstructures of Maraging Steel 250 Weldments and Effect of Post-Weld Heat Treatments

Cited by 45 publications

References 9 publications

On the effect of heat input in plasma microwelding of maraging steel

On the effect of heat input in plasma microwelding of maraging steel

Investigação Metalográfica Da Zona Afetada Pelo Calor Da Estrutura Soldada De Aço Maraging Com Aisi 8630 Modificado

Effect of Pulsed Current Gas Tungsten Arc Process on the Dissimilar Weldments between Nickel-based Superalloy/Austenitic Stainless Steel

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