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Water and Energy Abstracts
Year : 2008, Volume : 18, Issue : 1
First page : ( 21) Last page : ( 21)
Print ISSN : 0021-1672.

Metallurgy of Erosion of Under Water Parts in Hydro Electric Projects

Goel D.B.

(3rd International Conference on Silting Problems in Hydropower Projects, 27-28 February 2008, New Delhi, India, pp. 1-12)

Abstract

This paper describes the various metallurgical aspects related to silt erosion in under water parts of hydro electric projects. The metallurgical parameters affecting erosion primarily are (i) composition of target material, (ii) cast structure, (iii) metallographc structure, (iv) mechanical properties and the (v) heat treatment practice. Among the various mechanical properties, the tensile toughness and work hardening tendency are observed to be the most important parameters controlling erosion resistance of a target material. The 13/4 martensitic steel, currently being considered as the most suitable material for under water parts, poses difficulty in repair welding of damaged components. It is now believed that suitable nitronic steels need to be developed for better weldability and erosion resistance. Work on a nitronic steel carried out it IIT Roorkee has revealed that this steel possesses better erosion resistance than the 13/4 steel.

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