Microstructure Evolution and Properties of Ti-Nb-Zr-O High Elastic Titanium Alloy during Self-resistance Heating Treatment Process
The performance defect of high elastic loss exists in isothermal hot forming of thin-walled parts manufactured of high elastic titanium alloy.In this study,a new type of Ti-35Nb-2Zr-0.3O(Ti3523)high elastic titanium alloy was taken as the research object.The effects of solid solution and subsequent aging treatment under different heating methods on the microstructure and mechanical properties evolution of high elastic titanium alloy were investigated using rapid resistance heating and traditional muffle furnace heating.The influence mechanism of elastic modulus and yield strength was analyzed by microscopic EBSD.The results show that rapid resistance heating solution treatment at a faster heating rate(about 45℃/s)significantly inhibits grain coarsening and reduces dislocation annihilation.The yield strength after air cooling decreased by about 33.3%compared to the original cold-rolled sheet,which is significantly better than muffle furnace solution treatment.Meanwhile,the martensitic transformation trend is higher,and the elastic modulus is lower.After aging treatment,the rapid resistance heating speciment precipitated high-strength α phase,and both yield strength and elastic modulus were increased.Its elastic performance(Ur=4.056)is significantly higher than that of muffle furnace heating speciment(Ur=3.333),approaching that of the original sheet(Ur=4.577).The rapid heating high temperature forming method proposed in this study provides a feasible technical route for new aerospace equipment.
万方数据
维普
