Abstract

The microstructure, hardness and cavitation wear of Eurofer 97, Cr18Ni10Ti and 42HNM have been investigated. It was revealed that the cavitation resistance of the 42HNM alloy is by an order of magnitude higher than that of the Cr18Ni10Ti steel and 16 times higher than that of the Eurofer 97 steel. Alloy 42HNM has the highest microhardness (249 kg/mm2) of all the investigated materials, which explains its high cavitation resistance. The microhardness values of the Cr18Ni10Ti steel and the Eurofer 97 were 196.2 kg/mm2 and 207.2 kg/mm2, respectively. The rate of cavitation wear of the austenitic steel Cr18Ni10Ti is 2.6 times lower than that of the martensitic Eurofer 97.

Highlights

  • Realization of ambitious programs of development and construction of nuclear power plants of a new generation (GEN IV, Terra Power Wave reactor etc.) will be possible only after solutions of problems of nuclear material science are found

  • In this work, we studied the cavitation wear of promising reactor materials with different crystal structures – Eurofer 97 and 42HNM

  • The microstructure of Cr18Ni10Ti steel is austenitic with the presence of twins with an average grain size of 7.5 μm. 42HNM

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Summary

Introduction

Realization of ambitious programs of development and construction of nuclear power plants of a new generation (GEN IV, Terra Power Wave reactor etc.) will be possible only after solutions of problems of nuclear material science are found. Among the main promising materials for future generations of reactors, the ferrite-martensitic steel Eurofer 97 and the Cr-Ni-Mo alloy 42HNM stand out. One of the main reason for its selection are the high mechanical properties at service temperatures coupled with the low or reduced activation characteristic under radiation with the result of a very low loss of mechanical properties of the Eurofer 97 steel. This material behaviour has been reported in many studies and important initiatives are still ongoing [9,10,11]

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