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Title: Microstructural evolution during solution treatment of Co-Cr-Mo-C biocompatible alloys

Abstract

Three different Co-Cr-Mo-C alloys conforming to ASTM F75 standard were poured in an industrial environment and subjected to a conventional solution treatment at 1225 Degree-Sign C for several time intervals. The microstructural changes and transformations were studied in each case in order to evaluate the way in which treatment time influences the secondary phase fraction and clarify the microstructural changes that could occur. To assess how treatment time affects microstructure, optical microscopy and image analyzer software, scanning electron microscopy and energy dispersion spectrometry analysis were employed. The main phases detected in the as-cast state were: {sigma}-phase, M{sub 6}C, and M{sub 23}C{sub 6} carbides. The latter presented two different morphologies, blocky type and lamellar type. Despite being considered the most detrimental feature to mechanical properties, {sigma}-phase and lamellar carbides dissolution took place in the early stages of solution treatment. M{sub 23}C{sub 6} carbides featured two different behaviors. In the alloy obtained by melting an appropriate quantity of alloyed commercial materials, a decrease in size, spheroidization and transformation into M{sub 6}C carbides were simultaneously observed. In the commercial ASTM F75 alloy, in turn, despite being the same phase, only a marked decrease in precipitates size was noticed. These different behaviors could bemore » ascribed to the initial presence of other phases in the alloy obtained from alloyed materials, such as {sigma}-phase and 'pearlitic' carbides, or to the initial precipitate size which was much larger in the first than in the commercial ASTM F75 alloy studied. M{sub 6}C carbides dissolved directly in the matrix as they could not be detected in samples solution-treated for 15 min. - Highlights: Black-Right-Pointing-Pointer Three different Co-Cr-Mo alloys were poured under an industrial environment. Black-Right-Pointing-Pointer Transformation of existing phases followed during conventional solution treatment. Black-Right-Pointing-Pointer In as-cast/treated samples, phases were identified by color metallography, SEM and EDS. Black-Right-Pointing-Pointer M{sub 23}C{sub 6} {yields} M{sub 6}C transformation was corroborated by SEM and EDS analysis. Black-Right-Pointing-Pointer Carbide spheroidization was also detected prior a noticeably carbide size decreasing.« less

Authors:
 [1];  [2];  [1];  [2];  [1];  [3]
  1. IFIMAT, Instituto de Fisica de Materiales Tandil, Facultad de Ciencias Exactas, Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, B7000GHG Tandil (Argentina)
  2. (CONICET), Av. Rivadavia 1917, C1033AA, Buenos Aires (Argentina)
  3. (CICPBA), Calle 526 e/10 y 11, B1096APP, La Plata (Argentina)
Publication Date:
OSTI Identifier:
22066455
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 68; Journal Issue: Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM CARBIDES; COBALT CARBIDES; MATRIX MATERIALS; MECHANICAL PROPERTIES; MELTING; METALLOGRAPHY; MICROSTRUCTURE; MOLYBDENUM CARBIDES; MORPHOLOGY; OPTICAL MICROSCOPY; SCANNING ELECTRON MICROSCOPY; SOLIDIFICATION; TRANSITION ELEMENT ALLOYS; X-RAY SPECTROSCOPY

Citation Formats

Giacchi, J.V., E-mail: jgiacchi@exa.unicen.edu.ar, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Fornaro, O., Consejo Nacional de Investigaciones Cientificas y Tecnicas, Palacio, H., and Comision de Investigaciones Cientificas de la Provincia de Buenos Aires. Microstructural evolution during solution treatment of Co-Cr-Mo-C biocompatible alloys. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.03.006.
Giacchi, J.V., E-mail: jgiacchi@exa.unicen.edu.ar, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Fornaro, O., Consejo Nacional de Investigaciones Cientificas y Tecnicas, Palacio, H., & Comision de Investigaciones Cientificas de la Provincia de Buenos Aires. Microstructural evolution during solution treatment of Co-Cr-Mo-C biocompatible alloys. United States. doi:10.1016/J.MATCHAR.2012.03.006.
Giacchi, J.V., E-mail: jgiacchi@exa.unicen.edu.ar, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Fornaro, O., Consejo Nacional de Investigaciones Cientificas y Tecnicas, Palacio, H., and Comision de Investigaciones Cientificas de la Provincia de Buenos Aires. Fri . "Microstructural evolution during solution treatment of Co-Cr-Mo-C biocompatible alloys". United States. doi:10.1016/J.MATCHAR.2012.03.006.
@article{osti_22066455,
title = {Microstructural evolution during solution treatment of Co-Cr-Mo-C biocompatible alloys},
author = {Giacchi, J.V., E-mail: jgiacchi@exa.unicen.edu.ar and Consejo Nacional de Investigaciones Cientificas y Tecnicas and Fornaro, O. and Consejo Nacional de Investigaciones Cientificas y Tecnicas and Palacio, H. and Comision de Investigaciones Cientificas de la Provincia de Buenos Aires},
abstractNote = {Three different Co-Cr-Mo-C alloys conforming to ASTM F75 standard were poured in an industrial environment and subjected to a conventional solution treatment at 1225 Degree-Sign C for several time intervals. The microstructural changes and transformations were studied in each case in order to evaluate the way in which treatment time influences the secondary phase fraction and clarify the microstructural changes that could occur. To assess how treatment time affects microstructure, optical microscopy and image analyzer software, scanning electron microscopy and energy dispersion spectrometry analysis were employed. The main phases detected in the as-cast state were: {sigma}-phase, M{sub 6}C, and M{sub 23}C{sub 6} carbides. The latter presented two different morphologies, blocky type and lamellar type. Despite being considered the most detrimental feature to mechanical properties, {sigma}-phase and lamellar carbides dissolution took place in the early stages of solution treatment. M{sub 23}C{sub 6} carbides featured two different behaviors. In the alloy obtained by melting an appropriate quantity of alloyed commercial materials, a decrease in size, spheroidization and transformation into M{sub 6}C carbides were simultaneously observed. In the commercial ASTM F75 alloy, in turn, despite being the same phase, only a marked decrease in precipitates size was noticed. These different behaviors could be ascribed to the initial presence of other phases in the alloy obtained from alloyed materials, such as {sigma}-phase and 'pearlitic' carbides, or to the initial precipitate size which was much larger in the first than in the commercial ASTM F75 alloy studied. M{sub 6}C carbides dissolved directly in the matrix as they could not be detected in samples solution-treated for 15 min. - Highlights: Black-Right-Pointing-Pointer Three different Co-Cr-Mo alloys were poured under an industrial environment. Black-Right-Pointing-Pointer Transformation of existing phases followed during conventional solution treatment. Black-Right-Pointing-Pointer In as-cast/treated samples, phases were identified by color metallography, SEM and EDS. Black-Right-Pointing-Pointer M{sub 23}C{sub 6} {yields} M{sub 6}C transformation was corroborated by SEM and EDS analysis. Black-Right-Pointing-Pointer Carbide spheroidization was also detected prior a noticeably carbide size decreasing.},
doi = {10.1016/J.MATCHAR.2012.03.006},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 68,
place = {United States},
year = {2012},
month = {6}
}