%0 Journal Article
%T EFFECT OF AGING TIME ON PHASE TRANSFORMATION, MICROSTRUCTURE AND HARDNESS OF Co-Cr-Mo ALLOYS
%A Ali KELE£¿
%A Mehmet YILDIRIM
%J -
%D 2019
%X The effect of heat-treatment on phase relationships, microstructures and hardness of Co-Cr-Mo alloys were investigated in detail. The samples were produced by investment casting technique and subsequently solutionized (1240 ¡ãC for 4 h) and aged (720 ¡ãC for 2, 4, 8 and 16 h). Phase analysis of the samples were performed via X-ray diffraction analysis, microstructural examination were done by light optical and scanning electron microscopy. The microstructures of as-cast and short-time (2 and 4 h) aged samples were composed of FCC ¦Ã-Co matrix phase and fine M23C6 (where M= Co, Cr and Mo) precipitates. Increasing the aging time to 8 and 16 h led to partial transformation of FCC ¦Ã-Co matrix phase into HCP ¦Å-Co phase. The volume fraction of ¦Å-Co phase increased with increasing aging time. Moreover, hardness of the Co-Cr-Mo samples were significantly enhanced with formation of ¦Å-Co phase
%K Co-Cr-Mo ala£¿£¿mlar£¿
%K Mikroyap£¿
%K Sertlik
%U http://dergipark.org.tr/sujest/issue/43677/536510