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Kumar Amit, Pandey Shailesh M., Pandey Chandan

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e54, 2023

EN

A dissimilar joint of martensitic grade P92 and Ni-based Inconel 617 (IN617) alloy are employed commonly in advanced ultra-supercritical (AUSC) units to fabricate thick section components such as steam pipes and turbine rotors. This study investigated the weldability of the IN617 alloy and P92 steel dissimilar welds. Ni-based superalloy ERNiCrMo-3 filler was used to attempt the dissimilar joining for conventional V groove and narrow groove design by employing the gas tungsten arc welding (GTAW) process. The weld metal for the capping pass, backing pass, and near the interface showed the columnar and cellular grains while equiaxed grains are observed corresponding to root and filling passes. The energy dispersive spectroscopy and Electron probe micro-analyzer (EMPA) study confirmed the segregation of the Nb and Mo particles in inter-dendritic spaces and resulted in the formation of the Nb-rich NbC and laves phases and Mo-rich phases. The EDS line map and EPMA study of the P92 interface showed a sharp increase in Cr, Mo, and Ni concentration and a steep decrease in Fe concentration as moving from P92 base metal to weld metal. A negligible diffusion from filler weld to IN617 or vice versa across the IN617 interface was detected. The microhardness gradient along the weldments indicated a sharp rise in hardness value near the P92 fusion boundary due to the formation of the unmixed zone of lower hardness and the P92 coarse-grained heat-affected zone of higher hardness. The weld metal hardness results showed a great variation with an average hardness value for V groove and narrow groove welds of 227 and 262 HV, respectively. The mechanical tests were conducted at the ambient temperatures and data obtained for the weldments were compared with the base metals. The room temperature tensile tests showed the failure from the region of the P92 BM or the interface of P92 BM/weld metal, with joint strength of 646 ± 6 MPa and 747 ± 4 MPa in AW conditions for V groove and narrow groove, respectively. The Charpy impact test (CIT) also showed the variation in impact toughness along the weldments, and the ERNiCrMo-3 filler weld was identified as the weakest region of the welded joint in terms of impact toughness for both the groove designs. The residual stress variation along the thickness of the weld plate was measured using the deep hole drilling (DHT) methods, and the results indicated the peak magnitude of the residual stress for the V groove welded joint. The test results indicated that welded joint produced using ERNiCrMo-3 filler was safe for AUSC power plants' boiler applications for both the groove weld while optimum mechanical properties were measured for narrow groove weld.

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Struktura stopu Inconel 617 przeznaczonego na krytyczne elementy kotła energetycznego

Konieczna N., Adamiec J.

Rudy i Metale Nieżelazne Recykling

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2018

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R. 63, nr 10

15--19

PL

Rozwój przemysłu energetycznego wiąże się zarówno z wprowadzaniem nowej technologii jak i zaawansowanych materiałów. Jednym z nich jest Inconel 617, który w dokumentacjach technicznych kotłów wymieniany jest jako kandydat na jego krytyczne elementy. Z tego powodu istotna wydaje się być ocena struktury w stanie wyjściowym stopu, na którą składa się analiza i interpretacja wyników. W artykule przedstawiono opracowaną metodykę oceny jakościowej struktury stopu Inconel 617. Wykonana analiza struktury za pomocą mikroskopii świetlnej oraz elektronowej posłużą projektantom, konstruktorom oraz technologom do szacowania trwałości elementów krytycznych kotła.

EN

The power plant industry evolution is associated with development of new technology and advanced materials. One of them is Inconel 617 alloy, which is mentioned in technical documents as a candidate for critical elements of power plants. Therefore the structure assessment of Inconel 617 alloy in the initial state seems to be relevant. This evaluation is consisted of micro- and substructure analysis and results interpretation. This paper presents elaborated methodology of quality structure assessment. Light microscopy (LM), scanning electron microscopy (SEM) and scanning-transmission electron microscopy (STEM) analysis will help designers, constructors and technologists to estimate boilers critical elements durability.

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Przegląd zaawansowanych stopów niklu

Konieczna N.

Rudy i Metale Nieżelazne Recykling

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2018

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R. 63, nr 6

3--10

PL

W ostatnich latach dynamiczny postęp metod i technik badawczych stopów niklu, spowodował opracowanie i wprowadzenie nowych materiałów dla przemysłu energetycznego i lotniczego. Celem artykułu jest usystematyzowanie i przegląd wiadomości dotyczących nowych stopów niklu. W artykule została przedstawiona geneza stopów na osnowie niklu wraz z charakterystyką poszczególnych grup stopów na jego osnowie. Ponadto, omówiono spawalność stopów niklu na przykładzie Inconel 617.

EN

In recent years, the dynamic progress of research methods and techniques in nickel alloys has resulted in development and introduction of new alloys for the energy and aviation industries. The aim of the article is to systematize and review information about new nickel alloys. The article has elaborated the genesis of nickel alloys along with the characteristics of particular groups of nickel alloys. In addition, the weldability of nickel alloys on the example of Inconel 617 alloy was discussed.