Comparative analysis of domestic and foreign standards for metallographic examination of α+β titanium alloy for surgical implants

doi:10.13251/j.issn.0254-6051.2024.06.043

Abstract

Abstract: Microstructure requirements of titanium alloy in surgical implant standards in domestic and foreign were compared and analyzed. The microstructure of plates in GB/T 13810-2017 requires that the original β grain should be fully broken, and continuous grain boundary α phase is not allowed, the microstructure of bars and wires should conform to figure A.1 (a-i) of the standard. The latest versions of ISO 5832-3, ASTM F136, and ASTM F1472 all specify that the microstructure shall be equiaxial and/or elongated primary α phase distributed on the transformed β matrix, with no continuous α network on the prior β grain boundaries. Among them, the transverse microstructure of the bars in ISO 5832-3 shall correspond to A1-A9 in ISO 20160. Combined with the thermal mechanical processing technology of titanium alloy, when the temperature of hot processing and recrystallization is lower than the β transition temperature, or slowly cooling, high volume fraction of primary α phase and intergranular β will be obtained, recrystallization treatment at close to the β transition temperature will obtain equiaxial primary α phase uniformly distributed on the β matrix, which is represented by A1-A9 in the standard spectrum. After recrystallization above the β phase transition temperature, continuous grain boundary α, network α and lamellar α phases are obtained between the coarse β grains, which are manifested as A10-A24 in the standard diagram.

Key words: TC4 alloy, microstructure, domestic and foreign standards, heat treatment

CLC Number:

TG113

Li Fan, Gao Na, Zhang Luwen, Guo Linlin, Lou Gui, Zhang Bo. Comparative analysis of domestic and foreign standards for metallographic examination of α+β titanium alloy for surgical implants[J]. Heat Treatment of Metals, 2024, 49(6): 277-281.

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