고 코발트 - 니켈 이차 경화강에서의 M2C 석출물의 성장 거동에 관한 연구-PartⅠ. 시효처리의 영향

Abstract

Secondary hardening is accomplished by the precipitation of fine-scale M₂C alloy carbides in high CoNi steels containing the strong carbide-forming elements Cr and Mo. Thermodynamic stability and coarsening resistance of these carbides depend on the alloy content of these elements. Thermodynamic calculations are performed for the determination of phase diagram, composition of alloying elements M, mole fraction and lattice parameters of M₂C, and volume percent of austenite in AerMet 100 system. And these results are compared with experimental ones and the coarsening theory of rod-type particles.