The changes of matrix structure and precipitates of new maraging stainless steel 0.007C- 13Cr-7Ni4Mo- 4Co-2W at solid solution temperature 800~1200 ℃ have been studied by using thermodynamic calculation soft ware Thermo-Calc
and the structure of solid solution of maraging stainless steel was investigated by transmission electron microscope (TEM)
selected area diffraction pattern(SADP)and energy dispersive X-ray spectrometer(EDS).Results showed that the precipitate in maraging stainless steel at high temperature was Laves-Fe
2
Mo phase
and all precipitated phases were solved as solid solution temperature was more than 1050 ℃.