Effect of solution treatment and cooling media on the mechanical properties and corrosion behavior of Ti–6Mo–4Cr alloys

• M.D. Juliantoro¹, G. Senopati², M.S. Dwijaya², B.R. Elvira², Alfirano¹, C. Sutowo², D. Annur², E.P. Utomo² and A.D.H. Setyawan²

¹ Departement of Metallurgical Engineering, Faculty of Engineering, Sultan Ageng Tirtayasa University, Jl. Jendral Sudirman Km 3, Cilegon, Banten 42435, Indonesia
² Research Center for Metallurgy, National Research and Innovation Agency (BRIN), KST B.J. Habibie, Jl. Puspiptek Serpong, Tangerang Selatan, Banten 15314, Indonesia

Abstract: The study investigated the effects of solution treatment at temperatures of 800, 900, and 1000°C, and quenching in oil, ice water, and liquid nitrogen on Ti–6Mo–4Cr’s microstructure, elastic modulus, hardness, and corrosion behavior. The research findings indicate that the as-cast Ti–6Mo–4Cr alloy has an equiaxed β microstructure. On the other hand, rapid cooling through solution treatment results in dominant β phase, followed by α´ martensite and α" acicular phases. The study found that the alloy has the lowest modulus of elasticity at a solution treatment temperature of 1000°C and liquid nitrogen cooling media (83.6 GPa), and the highest hardness at a solution treatment temperature of 800°C and oil cooling media (496 HVN). Furthermore, the research shows that Ti–6Mo–4Cr has better corrosion resistance than Ti–6Al–4V, with an as-cast corrosion rate value of 0.00209 mmpy. The highest corrosion resistance was observed at a temperature of 800°C and ice water cooling media (1.25·10^–3 mmpy).

Keywords: β phase, Ti–Mo–Cr alloy, solution treatment, elastic modulus, corrosion behavior

Int. J. Corros. Scale Inhib., 2023, 12, no. 2, 477-488
doi: 10.17675/2305-6894-2023-12-2-6

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