Ali KELEŞ
(Konya Technical University, Faculty of Engineering and Natural Sciences, Department of Metallurgical and Materials Engineering, KONYA, TURKEY)
Mehmet Serdar YILDIRIM
(Konya Technical University, Faculty of Engineering and Natural Sciences, Department of Metallurgical and Materials Engineering, KONYA, TURKEY)
Yıl: 2019Cilt: 7Sayı: 1ISSN: 2147-9364 / 2147-9364Sayfa Aralığı: 146 - 153İngilizce

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EFFECT OF AGING TIME ON PHASE TRANSFORMATION, MICROSTRUCTURE AND HARDNESS OF Co-Cr-Mo ALLOYS
The effect of heat-treatment on phase relationships, microstructures and hardness of CoCr-Mo alloys were investigated in detail. The samples were produced by investment casting techniqueand subsequently solutionized (1240 °C for 4 h) and aged (720 °C for 2, 4, 8 and 16 h). Phase analysis ofthe samples were performed via X-ray diffraction analysis, microstructural examination were done bylight optical and scanning electron microscopy. The microstructures of as-cast and short-time (2 and 4 h)aged samples were composed of FCC γ-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 γ-Co matrixphase into HCP ε-Co phase. The volume fraction of ε-Co phase increased with increasing aging time.Moreover, hardness of the Co-Cr-Mo samples were significantly enhanced with formation of ε-Co phase.
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