Studied maraging stainless steel- 0. 007C

13. 44Cr

7. 47Ni

4. 15M()

4. 21 Co. 1. 84W . (). 12Ti was melted by a 15 kg vacuum induction kirnace and reinelt-relininei] by a vac mini e(>nsunial)le elrctrodr luriKice. rfhe 450 ~ 550 ℃  aging hanlvning cunes φ12 mm rolled samples solution-treaieH ai 1 100 X for 1 h was obtaine(! b\ lest and tht> aging hardening index and at'tivation energy of lhe steel was analyzed. Results showed that the aging prrcipikites in steel 00Crl3Ni7M<>4Co4W2Ti was R-phase ( Co-Cr-Mo intermetallic eonipound) with bar shape and hexagonal siruclure

its size was 10 〜3() mn ； the precipitating dynamics for R- phase could l)r tlescribed by Arrhenius eqiuition. the pre-precipitatioii was fountl ikiiing aging at Ivmperalurv less than 525 Y

with increasing aging I?ni])eralure

the aging hardening index increased nn(\ the calculated apparent activation energ)- for aging process was 156. 8 J/mol.