Construction of the precipitation and growth model of nano-sized oxide particles in oxide dispersion strengthened steel

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820325
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Hokkaido University
• Principal Investigator: OONO Naoko 北海道大学, 工学研究院, 助教 (40512489)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 酸化物粒子 / 分散強化 / 析出 / 自由エネルギー

Outline of Final Research Achievements

The process of precipitating oxide particles in oxide dispersion strengthened (ODS) steels during the temperature rising stage of sintering is studied, by analyzing the microstructure of the systematically heat treated mechanically alloyed (MA) powders, and classified by free energy of precipitation. Comparing the Ti, Al and Zr added / solute elements-free ODS steel, the calculation result of the precipitation critical radius and the activation energy of the precipitation at 700° C, which is the precipitation starting temperature of Y2O3, is small in the order of Y2Zr2O7 < Y2O3 < Y2Ti2O7 < YAlO3. This order agreed with the experimental result of this research.

Free Research Field

金属材料