Stellite 21 coatings on AISI 410 martensitic stainless steel by gas tungsten arc welding

Abstract

Degradation of AISI 410 martensitic stainless steel, a typical alloy for many applications such as steam turbine blade, could impair its efficiency and lifetime. To overcome this problem, critical surfaces could be modified by weld cladding via gas tungsten arc welding technique. In the present research, a comparative study of Stellite 21 weld overlays deposited in three different thicknesses, i.e. dilutions, at various preheat and post-weld heat treatment temperatures on the surface of AISI 410 martensitic stainless steel, has been made. The surface of coatings has been examined to reveal their microstructures, phase characterisation and mechanical properties using XRD, microhardness tester and metallographic techniques. The results showed that the deposition of Stellite 21 coating on AISI 410 martensitic stainless steel improved its corrosion resistance. Moreover, the volumetric dilution had a considerable effect on the hardness, microstructure and electrochemical corrosion behaviour of Stellite 21 weld overlays.

Synthesis of Fe based ZrB2 composite coating by gas tungsten arc welding

“…4,5 Among various surface engineering technologies, gas tungsten arc welding (GTAW) cladding is one of the most common methods for fabricating PMMCs. 6,7 Gas tungsten arc welding cladding shows several advantages compared with various cladding techniques such as laser cladding, plasma transferred arc powder cladding and thermal spraying. 8 Devices of GTAW are cheap and easy to operate.…”