The Effect of Cyclic Solution Heat Treatment on the Martensitic Phase Transformation and Grain Refinement of Co-Cr-Mo Dental Alloy

The Effect of Cyclic Solution Heat Treatment on the Martensitic Phase Transformation and Grain Refinement of Co-Cr-Mo Dental Alloy

The present study was undertaken to investigate the effect of continuous and discontinuous (cyclic) solution heat treatment on the athermal and isothermal ε martensite phase transformation in Co-28Cr-6Mo-0.3C implant alloy. The results showed that the cyclic solution heat treatment induced more of t...

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Bibliographic Details
Published in:Metals (Basel ) Vol. 10; no. 7; p. 861
Main Authors: Zangeneh, Shahab, Lashgari, Hamid Reza, Alsaadi, Shaimaa, Mohamad-Moradi, Sara, Saghafi, Morteza
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-07-2020
Subjects:
Alloys
Biocompatibility
Carbon
Chromium
Co-Cr-Mo alloy
Cobalt base alloys
Cooling
Corrosion
Corrosion resistance
Dental alloys
Electrodes
Free surfaces
Grain boundaries
Grain refinement
Grain size
Heat treating
Martensite
martensitic phase
Martensitic transformations
Mechanical properties
Metal fatigue
Microstructure
Molybdenum
Phase transitions
Quenching
reverse transformation
Solution heat treatment
solution treatment
Strain hardening
Surface properties
Thermal cycling
Thermal stress
Transmission electron microscopy
Transplants & implants
United States > US
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Summary:The present study was undertaken to investigate the effect of continuous and discontinuous (cyclic) solution heat treatment on the athermal and isothermal ε martensite phase transformation in Co-28Cr-6Mo-0.3C implant alloy. The results showed that the cyclic solution heat treatment induced more of the athermal ε martensite phase in the alloy than that of the continues one. In addition, the cyclic heat treatment contributes to the development of more isothermal martensite phase during isothermal aging at 850 °C and, moreover, grain refinement in the area beneath the sample surface. The severity of grain refinement was highly significant adjacent to the surface and decreased by increasing the distance from the sample free surface. This novel grain refinement in high-carbon Co-Cr-Mo alloy was attributed to the generation of larger quenching thermal stresses introduced beneath the surface during cyclic solution treatment. The repetitive heating/cooling cycle modifies the surface properties, refines the grain size and leads to uniform dispersion of the secondary carbides. The corrosion resistance of the cyclically solution heat-treated samples was superior as compared to the as-cast one.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10070861