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

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 →transformation occurs under 500℃. Synthetic addition of C and N causes the grains to refine and powerfully retards formation of martensite and precipitation of phase. Ms point is elevated with long term aging at elevated temperature (500-700℃) due to a large number ofstrain induced carbides precipitate. Along with accelerated decomposition of strain induced ' martensite and occurrence of recrystallization,γ →α transformation and phase precipitation are promoted so that austenite becomes unstable.