The TRIP effect will have a positive impact on the plasticity of titanium alloys, and it is of great significance to clarify the influencing factors for the development of titanium alloy plasticity improvement technology based on the TRIP effect.
In addition to the beta phase composition, the beta grain or beta phase size is also an important factor affecting the stress-induced martensite.A.Zafari et al. found that when the beta grain size is less than 300 μm, the mechanical energy required for the martensitic phase transformation decreases with the increase of grain size, and the martensitic phase transformation is more likely to occur with the increase of grain size.A.Bhattacharjee et al. studied the effect of beta grain size on stress-induced martensitic phase transformation in Ti-10V-2Fe-3A1 titanium alloy, and found that with the increase of grain size from 230 μm to 850 μm, the stress induced by martensitic phase transformation gradually decreased, and the TRIP effect of titanium alloy gradually increased.
Archana Paradkar et al. found that the induced stress showed a U-shaped curve with the increase of grain size. When the grain size is less than 1200 μm, the martensitic phase transformation-induced stress gradually decreases with the increase of grain size. The grain size continued to increase to 2000 μm, and the induced stress gradually increased. It is found that the change of grain size will lead to the change of the friction between the elastic distortion energy and the beta/α2 phase interface in the grain, thereby changing the Mahalanobis phase-conserving transformation free energy.
In addition to material intrinsic factors, external factors also affect the TRIP effect. The external factors affecting the TRIP effect are related to the deformation conditions, including the deformation temperature and deformation rate.
