Pad Welding of Inconel 625 Layer on Structural Steel Used in the Power Industry

E-ISSN： 1662-9779|2015|231|107-112

ISSN： 1012-0394

Source： Solid State Phenomena, Vol.2015, Iss.231, 2015-07, pp. : 107-7

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Abstract

Due to aggressive gases produced during combustion process of biomass, some elements of the power boiler should be covered with a material that possesses very high corrosion resistance (e.g. Inconel 625). This paper presents results of microstructural studies of Inconel 625 padding weld on waterwall elements (made of 13CrMo4-5 steel) for steam boiler designed for biomass combustion. The microstructural studies were carried out using Scanning- as well as Transmission Electron Microscopy methods. The padded weld layer exhibited dendritic structure. In the weld layer γ phase with an increased dislocation density and stacking faults was observed. In the base material (13CrMo4-5 steel) titanium nitrides, complex carbides and Laves phase enriched in niobium were observed.