Comparative study on martensitic transformation in Eurofer-97 and ODS-Eurofer steels for nuclear fusion application

• Grant number: 13/19197-9
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2013
• End date: November 30, 2015
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Hugo Ricardo Zschommler Sandim
• Grantee: Hugo Ricardo Zschommler Sandim
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

This project aims to investigate the martensitic transformation in two Eurofer-type ferritic martensitic steels. One of them, termed ODS-Eurofer, is an oxide-dispersion strengthened steel whereas the second steel is Eurofer-97 with similar chemical composition but without Y2O3 particles. Both steels are potential candidates for high-temperature structural applications such as plasma confinement chambers in future fusion reactors. Temperature peaks above operating temperature (550-650oC) cause by plasma disruptions may occur during operation leading to martensitic transformation upon further cooling. Both steels will be homogenized in vacuum at temperatures ranging from 900 up to 1350oC. Three important aspects will be focused in this project: a) evaluation of austenitic grain size via automated reconstruction of parent grains using EBSD data (ARPGE software) as well as via conventional quantitative metallography; b) evaluation of the amount of retained austenite using EBSD and X-ray diffraction; c) determination of orientation relationship between (reconstructed) parent grains and product grains using EBSD. Microstructural characterization will be conducted using SEM in the backscattered electrons mode, light optical microscopy, and Vickers microhardness testing. The transition temperatures will be determined by dilatometry with distinct heating rates. (AU)

Scientific publications

(6)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SANDIM, M. J. R.; RENZETTI, R. A.; BORMIO-NUNES, C.; SANDIM, H. R. Z.. Magnetic characterization of ODS-Eurofer steel: Remanent magnetization and magnetostriction behavior. FUSION ENGINEERING AND DESIGN, v. 126, p. 5-9, JAN 2018. (13/26506-8, 13/19197-9)

ZILNYK, K. D.; PRADEEP, K. G.; CHOI, P.; SANDIM, H. R. Z.; RAABE, D.. Long-term thermal stability of nanoclusters in ODS-Eurofer steel: An atom probe tomography study. JOURNAL OF NUCLEAR MATERIALS, v. 492, p. 142-147, AUG 2017. (13/19197-9)

SANDIM, M. J. R.; SOUZA FILHO, I. R.; BREDDA, E. H.; KOSTKA, A.; RAABE, D.; SANDIM, H. R. Z.. Short Communication on "Coarsening of Y-rich oxide particles in 9% Cr-ODS Eurofer steel annealed at 1350(A)over-cap (A)over-cap degrees C". JOURNAL OF NUCLEAR MATERIALS, v. 484, p. 5-pg., 2017-02-01. (13/26506-8, 13/19197-9)

SANDIM, M. J. R.; SOUZA FILHO, I. R.; BREDDA, E. H.; KOSTKA, A.; RAABE, D.; SANDIM, H. R. Z.. Short Communication on ``Coarsening of Y-rich oxide particles in 9% Cr-ODS Eurofer steel annealed at 1350(A)over-cap (A)over-cap degrees C{''}. JOURNAL OF NUCLEAR MATERIALS, v. 484, p. 283-287, FEB 2017. (13/26506-8, 13/19197-9)

ZILNYK, K. D.; ALMEIDA JUNIOR, D. R.; SANDIM, H. R. Z.; RIOS, P. R.; RAABE, D.. Misorientation distribution between martensite and austenite in Fe-31 wt%Ni-0.01 wt%C. ACTA MATERIALIA, v. 143, p. 227-236, JAN 15 2018. (14/23304-8, 13/19197-9)

ALMEIDA JUNIOR, D. R.; ZILNYK, K. D.; RAABE, D.; SANDIM, H. R. Z.. Reconstructing the austenite parent microstructure of martensitic steels: A case study for reduced-activation Eurofer steels. JOURNAL OF NUCLEAR MATERIALS, v. 516, p. 185-193, APR 1 2019. (14/23304-8, 13/19197-9)