Abstract
Effect of Heat Treatment on Microstructure, Mechanical Properties and Erosion Behaviour of Cast 21-4-N Nitronic Steel
Highlights
Erosion in underwater parts of hydroturbine by hard silt particles becomes a serious issue in hydropower plants located in Himalayan region of India
Severe damages are reported in hydroturbine components due to silt erosion which leads to decrease in the efficiency of the power plant [1,2,3]
In order to investigate the effect of heat treatment on microstructure, cubical specimens of 20 mm were solution treated at 1030°C and 1080°C for the holding time of 150 min
Summary
13/4 martensitic stainless steel (CA6NM) is being used as turbine blade material This steel is severely affected by prolonged exposure to slurry erosion and possesses poor weldability [4]. Extensive study has been carried out in the past to identify the factors responsible for severe erosive damages in hydroturbine components due to attack from silt-laden water. These factors can be broadly classified as impingement variables, erosive particle variables, and metallurgical variables. An attempt is made systematically to investigate the changes in the microstructure, mechanical properties and erosion behaviour of cast 21-4-N nitronic steel under different solution treatment condition
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