Cr12N alloy (% ： 2. 03 〜2.26C

0. 16 〜0. 33Si

0. 29 ~0. 37Mn

11. 86 〜11.96Cr

0. 09 〜0. 28N) is melted by a 10 kg vacuum induction furnace with N-alloying by filling nitrogen and adding silicon nitride. The Crl2N alloys bearing different N content are heated to 1 180 for 3 min with 10 °C/s at vacuum

then cooled to 1 100 ~900 °C for 20 s with 10 °C/s and compressed by 30% with 1 ~ 10%" by using a Gleeble-1500 thermo-mechanical simulation machine to get the true stress-strain curves and the effect of nitrogen on mechanical properties of the alloy at high temperature. Results show that N inhibits occurrence of dynamic recrystallization of alloy ； as deformation at high temperature the dynamic recovery is dominating softening mechanism of the Crl2N alloy； and as compared with 0. 09% N alloy and 0. 28% N alloy

the 0. 18% N alloy has higher peak stress and yield stress

and its recovery activation energy is lowest.