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Conference Poster Year : 2022

Experimental investigation and thermodynamic re-assessment of the Cr-Mo-Ti system

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Abstract

The ternary Cr-Mo-Ti system is a constitutive alloying system for steels and titanium alloys. Ferritic alloys with Cr, Mo and Ti contents have been studied, achieving good mechanical properties, corrosion resistance and microstructural stability to 550°C. Beta titanium alloys are nowadays largely employed in biomedical applications, and aviation and aerospace industries. The system is also interesting for the development of new high-entropy alloys with a body-centered cubic structure. The Calphad method is a useful tool to explore and study all these alloy systems. Nevertheless, the experimental data about this ternary system remains scarce and no recent data was published. Thermodynamical assessments were carried out by Lee et al.[1] and recently by Hu et al. [2]. The first assessment was based on the solid phase boundaries in the Ti-rich region published by Elliot et al. [3]. In the respective re-assessment, they added with a low weight data from Grum-Grizhimailo and Gromova [4]. Therefore, we will study the Laves phase extension in the ternary Cr-Mo-Ti system. DFT calculation will be used in order to obtain the enthalpy of formation of the metastable end-members. Cumulate data will be evaluated and used to re-assess the ternary system. References [1] J. Y. Lee, J. H. Kim, et H. M. Lee, « Effect of Mo and Nb on the phase equilibrium of the Ti-Cr-V ternary system in the non-burning β-Ti alloy region », J. Alloys Compd., vol. 297, n 1, p. 231-239, févr. 2000, doi: 10.1016/S0925-8388(99)00557-5. [2] B. Hu, J. Wang, C. Wang, Y. Du, et J. Zhu, « CALPHAD-type thermodynamic assessment of the Ti-Mo-Cr-V quaternary system », Calphad, vol. 55, p. 103-112, déc. 2016, doi: 10.1016/j.calphad.2016.08.003. [3] R. Elliott, B. Levinger, et W. Rostoker, « System Titanium-Chromium-Molybdenum », Trans. Am. Inst. Min. Metall. Eng., vol. 197, n 11, p. 1544-1548, 1953. [4] N. B. Grum-Grzhimaylo et V. G. Gromova, « Phase diagram of the Ti-Cr-Mo-system at 1200, 900 and 600°C », Akad Nauk SSSR, vol. 7, p. 35-42, 1962.
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Dates and versions

cea-03700275 , version 1 (21-06-2022)

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  • HAL Id : cea-03700275 , version 1

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Agustin Flores, Paul Fossati, Sylvie Chatain, Jean-Marc Joubert. Experimental investigation and thermodynamic re-assessment of the Cr-Mo-Ti system. CALPHAD GLOBAL 2022, May 2022, Stockholm, Sweden. 2022. ⟨cea-03700275⟩
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