Erosion behaviour of hydro turbine steels

Bulletin of Materials Science

关键词: in situ strain hardening;    solid particle erosion;    tensile toughness;    13/4 martensitic stainless steel;    21–4–N nitronic steel.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The martensitic stainless steel (termed as 13/4) is currently being used for fabrication of underwater parts in hydroelectric projects. There are, however, several maintenance problems associated with the use of this steel. A nitronic steel (termed as 21–4–N) has been developed as an alternative with the specific aim of overcoming these problems. A comparative study has been made on the erosion behaviour of 13/4 and 21–4–N steels by means of solid particle impingement using gas jet. The eroded surfaces after erosion tests were analysed by scanning electron microscopy. It is observed that the 21–4–N nitronic steel possesses better resistance to erosion in comparison to 13/4 martensitic stainless steel. The austenitic matrix of the nitronic steel possesses high hardness, high tensile toughness and work hardening ability, which results in higher erosion resistance.

【 授权许可】

CC BY