|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||Understanding Micromechanical Deformation in Hard-facing Alloys for Improving Galling Resistance
||Chong Zhao, Jun Jiang, Fionn Dunne
|On-Site Speaker (Planned)
Galling is one of the critical surface failure modes of valve and pump components in nuclear reactors. The failure mechanisms are thought to be influenced by local microstructure as well as key surface characteristics including roughness. Iron-base alloys are under consideration in order to remove potentially harmful radioactive sources resulting from cobalt alloys. In this work, three hard-facing iron-based alloys (Nitronic 60, Tristelle 5183 and RR2450) and a cobalt alloy (Stellite 6) are studied, all of which give significantly different galling performance. Each of these four materials has been subjected to deformation and quantitative characterisation using high-resolution EBSD and digital image correlation such that elastic and plastic strains, and their evolving spatial distributions in fully characterised microstructures have been captured and compared. Furthermore, crystal plasticity finite element (CPFE) modelling has been utilised to provide analysis and interpretation of the experimental observations, such that optimal galling-resistant microstructures may be achieved.
||Planned: Supplemental Proceedings volume