The Effect of Dilution on Microsegregation in AWS ER NiCrMo-14 Alloy Welding Claddings

Abstract

Dilution and microsegregation are phenomena inherent to claddings, which, in turn, directly affect their main properties. This study evaluated microsegregation in the fusion zone with different dilution levels. The overlays were welded by the TIG cold wire feed process. Dilution was calculated from the geometric characteristics of the claddings and from the conservation of mass equation using chemical composition measurements. Microsegregation was calculated using energy dispersive X-ray spectroscopy measurements of the dendrites and the chemical composition of the fusion zone. The dilution of the claddings was increased by reducing the wire feed rate. Fe showed potential to be incorporated into the solid phase (k > 1), and this increased with the increase of dilution. Mo, in turn, was segregated into the liquid phase (k < 1) and also increased with the increase of dilution. However, Cr and W showed a slight decrease in their partition coefficients (k) with the increase of dilution.

Mechanical Properties and Microstructural Characterization of Aged Nickel-based Alloy 625 Weld Metal

“…[1] Furthermore, these alloys exhibit extraordinary resistance to a wide range of organic and mineral acids due to their excellent corrosion resistance properties, mainly, at high temperatures, and, therefore, are commonly found in the marine, aerospace, chemical and oil and gas industries. [2][3][4][5] The alloy Inconel® 625 stands out as one of the leading commercial Ni-Cr-Mo-Nb alloy grades. [2] The development of this alloy in 1964 was designed to meet the market of alloys for high temperature service.…”

Efeito da Diluição Sobre a Microestrutura da Liga AWS ER NiCrMo-14 na Soldagem de Revestimentos pelo Processo TIG com Alimentação de Arame Frio

“…Além disso, estas fases deletérias provocam regiões suscetíveis a corrosão na sua interface entre matriz e precipitado [4,7,8,14]. Miná et al [17] avaliaram o efeito da diluição na microssegregação em revestimentos de liga Inconel 686. Os resultados mostraram haver alterações relevantes na microssegregação de alguns elementos de liga.…”

“…Os resultados mostraram haver alterações relevantes na microssegregação de alguns elementos de liga. Mais informações quanto ao efeito da diluição na microssegregação de revestimentos dissimilares com a liga Inconel 686 podem ser encontrados no referido estudo [17].…”

Performance of the INCONEL 625 alloy weld overlay obtained by FCAW process

“…In comparison with other methods, weld overlays are characterized by strong metallurgical bonding with the base material, due to the interpenetration of the deposited and supporting materials; it is also relatively easy to produce an overlay free from pores or other defects [9]. In this respect, there are several initiatives in order to develop overlays and/or cladding procedures using nickel-based superalloys as an alternative for manufacturing equipment whose external or internal surfaces require specific properties [5,[7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…Usually, weld overlays are deposited by gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) processes [3,4,7,10,11,14,[17][18][19][20][21][22]. GTAW is very often used for cladding of critical parts especially for offshore subsea equipment due to its very high quality welds, while GMAW is the most applied welding process in Europe, United States of America and Japan due to its higher deposition rate [4].…”