Abstract
This work presents a comprehensive study on the microstructure evolution and mechanical property under different heat treatment procedures of a new near β type titanium Ti-5321(Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe). Two solution temperatures(830°C and 900°C) and a group of aging temperatures(300-650°C) were carried out to investigate the influence of heat treatment on this new alloy. The strengthening mechanism of Ti-5321 after solution and aging treatment was discussed by analyzing the microstructure and its mechanical properties. The best ultimate tensile strength can be achieved to 1564 MPa with 5% on elongation when solution treated at 830°C and aging at 450°C for this new alloy. The lamellar and globular α grains can be found in all 830°C solution treated specimens which contribute to a better ductility. Ultra-fine α phase can be found in all low aging temperature treated specimens but will coarsen significantly when raising the aging temperature and thus increase the tensile strength and lower the ductility. All these results can provide a comprehensive guidance on heat treatment for this new near β type titanium in the future.
Highlights
The precipita on kine cs is quite slow for β or near β type tanium and it is fast enough to keep considerable amount of β grains in the matrix when air cooling from high temperature near phase transus temperature[8]
In order to inves gate the influence of heat treatment on microstructural characteris cs and tensile proper es of this new near β tanium alloy Ti-5321, a comprehensive heat treatment with two solu on temperatures and a group of aging temperatures were carried out in this study
Following conclusions can be made based on the results: 1. The microstructures and mechanical proper es of near β tanium like Ti-5321 are sensi ve to solu on temperature and aging temperature
Summary
The best tensile strength is 1564 MPa with 5% on elonga on when Ti5321 treated at α/β solu on temperature and aged at 450°C. The results show that the changing rates of tensile strength and elonga on of these specimens can be divided into two stages when grouping by solu on temperature.
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