Abstract
13/4 low carbon martensitic stainless steel is conventionally used for turbine blades in hydroelectric power plants. Due to silt erosion and cavitation, heavy damage often occurs in this material. In order to enhance the life of hydro-turbine components, repair welding is needed. Selection of proper welding parameters during repair welding is therefore essential in order to control any possible deterioration of its mechanical properties. This work deals with heat affected zone (HAZ) simulation of 13/4 martensitic stainless steel using a thermomechanical simulator, Gleeble® 3800. Assessment of Charpy impact toughness, tensile properties, and hardness of HAZ simulated specimens is done. Peak temperatures of 1,000°C, 1,200°C, and 1,325°C and preheat temperatures of 30°C and 121°C are used. High impact toughness (52.8 J) and ductility (19.3%) is observed in steel specimens simulated with peak temperature of 1,000°C along with 121°C preheat temperature. The observed results are explained based on the microstructural changes resulting from different welding parameters.
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