Rapid Optimization of Microstructure–Hardness Relationship in Ti-Al-V-Zr-Nb-Mo Alloy via Gradient Heat Treatment
Lijuan Zhu, Chun Feng, Yuanlong Liang, Wei Luo, Kai Zhang, Ligang Zhang, Bin Wang, Huiqun Liu
TL;DR
This paper introduces a gradient heat treatment method to quickly optimize the microstructure and hardness of a titanium alloy.
Contribution
The study introduces a gradient heat treatment strategy to rapidly optimize microstructure–hardness relationships in titanium alloys.
Findings
Hardness reaches a minimum at a Vαp/Vβt ratio of approximately 0.5.
Peak hardness (>350 HV1) is achieved at specific aging temperatures with an optimal Vαp/Vβt ratio of 3:7.
The gradient approach effectively correlates heat treatment parameters with microstructure and properties.
Abstract
This study employed a gradient heat treatment strategy to efficiently acquire microstructure parameters and establish the microstructure–hardness relationship in Ti-6Al-4V-1.5Zr-1.0Nb-0.5Mo alloy, addressing the knowledge gap in rapid optimization of heat treatment windows. Gradient solution treatment in the α + β region (859–928 °C) revealed that hardness reaches a minimum at a Vαp/Vβt ratio of approximately 0.5, a condition to be avoided if aging is not applied. Subsequent aging at 500 °C, a common temperature for such alloys, highlighted the solution-treated sample at 908 °C as possessing high hardening potential, attributed to its high βt fraction (Vβt = 70%) and sufficient retained β phase that promoted fine αs precipitation. Gradient aging (502–590 °C) of this optimized microstructure further showed that peak hardness (>350 HV1, measured under a 1 kg load) was achieved at 502 °C…
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Taxonomy
TopicsTitanium Alloys Microstructure and Properties · Intermetallics and Advanced Alloy Properties · High Entropy Alloys Studies