Metallurgical characterizations and mechanical properties on friction welding of Incoloy 800H joints

Anand, K.; Kumar, Sunil; Tamilmannan, K.; Sathiya, P.; Arivazhagan, B.

doi:10.1557/jmr.2016.161

Cited by 15 publications

(2 citation statements)

References 8 publications

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“…The heat exchanger has components made up of P91 steel and Incoloy 800HT ® (IN 800HT) (Refs. 3,4). Welding these two materials is preferred to limit assembly components and cost.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Linked Mechanical Properties of P91-Incoloy 800HT Dissimilar Metal Welds

BHANU,

GUPTA,

PANDEY

2024

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Dissimilar metal welds (DMWs) between P91 steel and Incoloy 800HT® using shielded metal arc welding (SMAW) with ENiCrCoMo-1 filler electrode were characterized in detail. The impact of multiple weld passes on microstructure in the heat-affected zone (HAZ) and weld fusion zone (WFZ) was thoroughly investigated. Postweld heat treatment (PWHT) impacts on mechanical characteristics and microstructure were also observed. The DMW was observed with heavy C, Cr, and Mo microsegregation in the WFZ, which deteriorated mechanical strength. The microstructural changes directly affected the mechanical behavior of the DMW. The ultimate tensile strength of the weld fusion zone was low at 576 MPa compared to the base metals’ strength. The tensile specimens failed in the IN 800HT base metal and WFZ. The WFZ had significant microsegregation near the solidified grain boundaries (SGBs). The metallurgical heterogeneity in the WFZ caused the formation of localized stress zones, which directly affected the mechanical behavior of the WFZ. The carbide particles influenced the microhardness in the WFZ and P91 HAZ regions. The PWHT successfully homogenized the microhardness in the WFZ and P91 HAZ regions. The impact toughness decreased to 64 J from 82 J after PWHT due to precipitation at SGBs and its coarsening. The SMAW process involves multiple thermal cycles during welding. The deposition of filler metal in multiple welding passes created uncontrolled variations in the solidification behavior of the WFZ. Microsegregation had a detrimental impact on the microstructure and mechanical properties of the P91 and IN 800HT dissimilar metal welds.

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“…The heat exchanger has components made up of P91 steel and Incoloy 800HT ® (IN 800HT) (Refs. 3,4). Welding these two materials is preferred to limit assembly components and cost.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Linked Mechanical Properties of P91-Incoloy 800HT Dissimilar Metal Welds

BHANU,

GUPTA,

PANDEY

2024

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“…The nickel-based superalloy 718 was joined using a linear friction welding (LFW) technique, and it was reported that LFW yielded sound weld joints without the typical fusion welding defects such as voids, inclusions, and the liquation of low melting phases [ 15 ]. Anand et al have developed solid-state 800H weld joints using a rotary friction welding technique using different welding parameters [ 16 ]. The dynamic recrystallization of the weld metal during the welding resulted in fine grains (<50 µm) in the weldment, which is lower than the specified minimum American society for testing and materials (ASTM) grain size number five (65 µm).…”

Section: Introductionmentioning

confidence: 99%

Influence of Post Weld Heat Treatment on the Grain Size, and Mechanical Properties of the Alloy-800H Rotary Friction Weld Joints

et al. 2021

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This study evaluated the microstructure, grain size, and mechanical properties of the alloy 800H rotary friction welds in as-welded and post-weld heat-treated conditions. The standards for the alloy 800H not only specify the composition and mechanical properties but also the minimum grain sizes. This is because these alloys are mostly used in creep resisting applications. The dynamic recrystallization of the highly strained and plasticized material during friction welding resulted in the fine grain structure (20 ± 2 µm) in the weld zone. However, a small increase in grain size was observed in the heat-affected zone of the weldment with a slight decrease in hardness compared to the base metal. Post-weld solution heat treatment (PWHT) of the friction weld joints increased the grain size (42 ± 4 µm) in the weld zone. Both as-welded and post-weld solution heat-treated friction weld joints failed in the heat-affected zone during the room temperature tensile testing and showed a lower yield strength and ultimate tensile strength than the base metal. A fracture analysis of the failed tensile samples revealed ductile fracture features. However, in high-temperature tensile testing, post-weld solution heat-treated joints exhibited superior elongation and strength compared to the as-welded joints due to the increase in the grain size of the weld metal. It was demonstrated in this study that the minimum grain size requirement of the alloy 800H friction weld joints could be successfully met by PWHT with improved strength and elongation, especially at high temperatures.

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Effect of Silicon Segregation in the Argon Arc Welded Incoloy 20 Superalloy

Natesh¹,

Selvaraj

Arivazhagan

et al. 2022

Silicon

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Metallurgical characterizations and mechanical properties on friction welding of Incoloy 800H joints

Abstract: Abstract

Cited by 15 publications

References 8 publications

Microstructure-Linked Mechanical Properties of P91-Incoloy 800HT Dissimilar Metal Welds

Microstructure-Linked Mechanical Properties of P91-Incoloy 800HT Dissimilar Metal Welds

Influence of Post Weld Heat Treatment on the Grain Size, and Mechanical Properties of the Alloy-800H Rotary Friction Weld Joints

Effect of Silicon Segregation in the Argon Arc Welded Incoloy 20 Superalloy

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