Titanium alloy materials have the characteristics of high specific strength, high yield ratio, high resistance to deformation, and excellent process plasticity and superplasticity. Titanium rod products are widely used in various fields of the national economy. There are titanium alloy rods on aerospace aircraft Rivet connection made after cold heading. At present, there is a lack of analysis on the heat treatment and microstructure of small-diameter titanium alloy bars (≤ Φ10mm) in hot continuous rolling and rolled bars. In response to this problem, technicians performed high-temperature compression tests on Gr5 alloy on a Gleeble500 thermal simulator The flow stress curves of Gr5 titanium alloy at different temperatures and different strain rates provide the necessary process parameters for hot continuous rolling of titanium alloy bars, and the microstructure and properties of the rolled products are analyzed.
The study found:
1. From the viewpoint of reducing deformation resistance, improving the formability of the material, and ensuring the properties of the final rolled structure, the optimal rolling temperature of Gr5 titanium alloy bar is 950 ° C, which is slightly lower than the phase transition temperature of Gr5 titanium alloy; The best strain rate is 1s-1, so that the work hardening caused by strain and strain rate during deformation is small, and the plasticity of the material is fully utilized;
2. Φ12 and Φ6mm bars are obtained through hot continuous rolling of a three-roller Y-rolling mill. The structure of Φ12mm bars is the equiaxed primary α phase + α bars + β transformation structure, and the grain diameter is about 3-10 μm; The shaft primary α phase + fine stripe α phase + β transformation structure, the grain size does not exceed 1 μm. It can be seen that as the cumulative deformation increases, the grain size decreases significantly;
3. The structure and mechanical properties of Gr5 titanium alloy bars obtained by hot continuous rolling of three-roll Y-type rolling mill can meet the technical requirements. The rolling equipment, rolling process parameters and heat treatment system used in the test can produce titanium alloy bars that meet the requirements, thereby providing a technical basis for further industrial production.
titanium rod grade 12 titanium pipe grade 2 titanium sheet titanium forging
The study found:
1. From the viewpoint of reducing deformation resistance, improving the formability of the material, and ensuring the properties of the final rolled structure, the optimal rolling temperature of Gr5 titanium alloy bar is 950 ° C, which is slightly lower than the phase transition temperature of Gr5 titanium alloy; The best strain rate is 1s-1, so that the work hardening caused by strain and strain rate during deformation is small, and the plasticity of the material is fully utilized;
2. Φ12 and Φ6mm bars are obtained through hot continuous rolling of a three-roller Y-rolling mill. The structure of Φ12mm bars is the equiaxed primary α phase + α bars + β transformation structure, and the grain diameter is about 3-10 μm; The shaft primary α phase + fine stripe α phase + β transformation structure, the grain size does not exceed 1 μm. It can be seen that as the cumulative deformation increases, the grain size decreases significantly;
3. The structure and mechanical properties of Gr5 titanium alloy bars obtained by hot continuous rolling of three-roll Y-type rolling mill can meet the technical requirements. The rolling equipment, rolling process parameters and heat treatment system used in the test can produce titanium alloy bars that meet the requirements, thereby providing a technical basis for further industrial production.
titanium rod grade 12 titanium pipe grade 2 titanium sheet titanium forging
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