Microstructural characterization of dissimilar welds between alloy 800 and HP heat-resistant steel

Dehmolaei, R.; Shamanian, M.; Kermanpur, A.

doi:10.1016/j.matchar.2008.01.013

Cited by 80 publications

(28 citation statements)

References 8 publications

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“…Therefore, chromium, molybdenum, iron, nickel, titanium, silicon can diffuse from the weldmetal to the base metal, so to form a secondary precipitates. But carbon diffused from weld metal to base metal and in the weldmetal presence of Ti, Ni, Cr, and Mo precipitates is confirmed by EDS analysis 20 . The OM, SEM and EDS analyses of the fusion zone of the experiment 2 are shown in Figure 6.…”

Section: The Microstructure Of Fusion Zonementioning

confidence: 74%

Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints

2018

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In this work, microstructural characterization and mechanical properties of P91 and Incoloy 800HT dissimilar laser beam welded joint were analyzed. In addition to that, metallographical studies were conducted using Optical microscopy, Scanning electron microscopy (SEM) equipped with Energy-dispersive X-ray spectroscopy (EDX) and X-Ray diffraction analysis (XRD). Effect of specific point energy on weld microstructure was predicted and it was compared with fusion zone hardness. The δ-ferrite content of the welds was predicted and it was correlated with the results measured by ferritoscope. Increase in heat input led to a minimal increase in the weld bead width and also the depth of penetration as predicted by microstructural studies. The traces of δ-ferrite in the interface of P91 side led to higher strength and microhardness of the weld. Failure of tensile specimens in the HAZ of Incoloy 800HT side was because of lower ferrite content (0 to 0.36) in that region and also due to the presence of the brittle intermetallic phases. The tensile strength of higher specific point energy welds was greater compared to other welds because of precipitation hardening and presence of δ-ferrite. Fractography results of fracture surfaces contain uniform dimples which showed that the failure took place in a ductile mode.

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Section: The Microstructure Of Fusion Zonementioning

confidence: 74%

Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints

2018

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“…Observam-se microestruturas completamente austeníticas na zona fundida central e na região do amanteigamento, às quais não sofreram transformações alotrópicas durante a operação de soldagem [25]. Nota-se na região do amanteigamento e na zona fundida central uma textura dendrítica com precipitados intra e interdendriticos.…”

Section: Resultsunclassified

Caracterização microestrutural de soldas dissimilares dos aços ASTM A-508 e AISI 316L

et al. 2010

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ResumoAs soldas dissimilares (dissimilar metal welds -DMWs) são utilizadas em diversos segmentos da indústria. No caso específico de usinas nucleares, tais soldas são necessárias para conectar tubulações de aço inoxidável com componentes fabricados em aços baixa liga. Os materiais de adição mais utilizados neste tipo de solda são as ligas de níquel 82 e 182. Este trabalho consistiu na soldagem de uma junta dissimilar de aço baixa liga ASTM A-508 G3 e aço inoxidável austenítico AISI 316L utilizando as ligas de níquel 82 e 182 como metais de adição. A soldagem foi realizada manualmente empregando os processos de soldagem ao arco SMAW (Shielded Metal Arc Welding) e GTAW (Gas Tungsten Arc Welding). Os corpos de prova foram caracterizados microestruturalmente utilizando-se microscópio óptico e microscópio eletrônico de varredura com microanálise por dispersão de energia de raios X (EDS) e ensaios de microdureza Vickers. Observou-se uma microestrutura constituída de dendritas de austenita com a presença de precipitados com formas e dimensões definidas pelo aporte térmico e pela direção de soldagem. Não houve variação significativa da dureza ao longo da junta soldada, demonstrando a adequação dos parâmetros de soldagem utilizados. Palavras-chave: Aço baixa liga. Aço inoxidável austenítico. Soldas dissimilares. Ligas de níquel. Caracterização microestrutural. AbstractThe dissimilar metal welds (DMWs) are used in several areas of the industries. In the nuclear power plant, this weld using nickel alloy welding wires is used to connect stainless steel pipes to low alloy steel components on the reactor pressured vessels. The filler materials commonly used in this type of weld are nickel alloys 82 and 182.. In this study, dissimilar metal welds composed of low alloy steel ASTM A-508 G3, nickel alloys 82 e 182 as weld metals, and austenitic stainless steel AISI 316L were prepared by manual shielded metal arc welding (SMAW) and gas tungsten arc welding techniques (GTAW). Samples were microstructural characterized by optical microscopy and scanning electron microscopy using energy dispersive X ray microanalysis (EDS). It was noticed that there was a microstructure consisting of austenite dendrites with the presence of precipitates with shapes and dimensions set by the thermal contribution and direction of welding. There was no significant variation of hardness along the weld joint, demonstrating the suitability of the welding parameters used.

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“…For the HAZ, an austenite (g) phase matrix comprises the main structural composition with twin line and NbC carbide distribution in the parent phase. 12 The hardness of the weld specimens is 187.3 and 177.1 HV in the FZ and HAZ, respectively. Figure 5(b) shows that the FZ has predominantly degraded into a grain of the g phase matrix.…”

Section: Microstructure Analysismentioning

confidence: 96%

Investigation into the influence of post-weld heat treatment on the microstructure and hardness of Inconel X-750

Peasura

Poopat

2015

Advances in Mechanical Engineering

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This work describes a post-weld heat treatment for a precipitation-hardened nickel alloy. Inconel X-750 is a nickel-based superalloy for gas tungsten arc welding processes. The materials were heat-treated in two steps: solution and aging. The post-weld heat treatment variables examined in this study included post-weld heat treatment temperatures of 705°C, 775°C, and 845°C and post-weld heat treatment time of 2-24 h in 2-h increments. The resulting materials were examined using the full factorial design of experiments to determine the resulting material hardness and observed with optical microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy in the fusion zone and heat-affected zone. The results show that a longer post-weld heat treatment time corresponds to larger g 0 precipitates and a smaller amount of Cr 23 C 6 at the grain boundaries, which can decrease the overall hardness. The post-weld heat treatment analysis indicates that an increase in the amount of g 0 results in better mechanical properties for particles with octagonal shapes and a small size. A factorial analysis, which was conducted on the relationship between the post-weld heat treatment temperature and time to the hardness of the fusion zone, had a 95% confidence level.

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Microstructural characterization of dissimilar welds between alloy 800 and HP heat-resistant steel

Cited by 80 publications

References 8 publications

Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints

Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints

Caracterização microestrutural de soldas dissimilares dos aços ASTM A-508 e AISI 316L

Investigation into the influence of post-weld heat treatment on the microstructure and hardness of Inconel X-750

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