CorroZoom webinar Stress Corrosion Cracking of Stainless Steels and Nickel Base Alloys

Stress Corrosion Cracking of Stainless Steels and Nickel Base Alloys

En-Hou Han

Institute of Corrosion Science and Technology (ICoST)

South China University of Technology (SCUT)

Guangzhou, China

Abstract

Stress corrosion cracking (SCC) of different materials happens in various industries. Although SCC has long history and researchers have revealed considerable understanding, the mechanisms are not clear and accurate prediction of SCC is still not possible. Many factors affect SCC, including but not limited to alloy composition and microstructure, environment, and load (stress, strain and strain rate). This lecture will mainly discuss SCC crack initiation and propagation for Fe-Cr-Ni alloys, both stainless stainless steels and nickel-base alloys, and will especially focus on the effects of local parameters (local material, local chemical & electrochemical and local mechanical conditions). The electrochemical corrosion behavior and the chemical composition, microstructure and electronic characters of oxide films for stainless steels and Ni base alloys used in nuclear power plants will be reviewed. The effects of water chemistry and material microstructure on oxide films were analyzed in order to relate oxide film properties to electrochemical behavior. The effect of the surface after surface finishing, grinding, machining or scratching on corrosion and SCC initiation in simulated primary water of nuclear power plants will be discussed because the different manufacturing techniques can cause the formation of microstructures of different gradients near the surface and also cause large differences in surface deformation. SCC propagation in various conditions will be presented as will an SCC prediction model that has bee applied to real nuclear power industry components. Finally, future research trends on the topic will be proposed.

Biography

Dr. En-Hou Han is a full professor of South China University of Technology (SCUT), President of Institute of Corrosion Science and Technology (ICoST). He received his Ph.D. from Northeastern University in Shenyang, China in 1990. From 1995-1998 he was a research scientist at Massachusetts Institute of Technology (MIT) and was a professor at the Institute of Materials Research in Shenyang from 1998-2023. Prof. Han’s research interests include (1) Localized corrosion mechanism understanding and characterization, especially the interaction of mechanical and chemical effects, such as corrosion fatigue, stress corrosion cracking and hydrogen embrittlement for various materials in harsh environments; (2) Corrosion prevention techniques such as nanocomposite coatings, plating, inhibitors & cathodic protection; (3) Service lifetime prediction and failure analysis for engineering structure and components by big data modelling, digital twins & artificial intelligence (AI); (4) R & D of corrosion resistant alloys (including HEAs) in severe industry environment including new energy industries, energy storage and sea water. He received many awards and honors and has leadership roles in the corrosion and materials communities.

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