Phase stability in an austenitic Fe-Cr-Mn （W,V） alloy

Benfu Hu, Chengchang Jia Hiroshi Kinoshita Heishichiro Takahashi1) Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China2) Center for Advanced Research of Energy Technology Hokkaido University, Sappo

摘 要：By means of deformation and long term aging, the stability and phase equilibrim characteristic of the C+N synthetically strengthening austenitic Fe-Cr-Mn （W,V） alloy were investigated. Experimental results indicate that the austenitic alloy remains stability and no γ→α transformation occurs under 500℃. Synthetic addition of C and N causes the grains to refine and powerfully retards formation of ?martensite and precipitation of a phase. M, point is elevated with long term aging at elevated temperature （500-700℃） due to a large number of strain induced carbides precipitate. Along with accelerated decomposition of strain induced α’ martensite and occurrence of recrystallization, γ→α transformation and σ phase precipitation are promoted so that austenite becomes unstable.

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