High strength alloy material preparation technology field is a high speed impact resistant low cost titanium alloy. Using Cr Fe intermediate alloy, aluminum beans, elemental boron and sponge titanium, according to the weight percentage is: Al: 0 ~ 3%, Cr: 2 ~ 6%, Fe: 1 ~ 3%, B: 0 ~ 0.1%, the allowance for titanium, layered cloth pressed electrode, with conventional vacuum self-consumption melting furnace two smelting alloy ingot. The invention strictly controls the content of Cr and Fe in titanium alloy and adds element B, effectively refining the as-cast structure, making the raw material cost of the alloy lower than the raw material cost of the existing titanium alloy, about three-quarters of the common Titanium 6AL-4V (Grade 5), the dynamic performance of the maximum uniform plastic strain is greater than 0.25, the impact absorption work can reach 300MJ/m3. Meet the use of high speed impact load.
Titanium and titanium alloy have a series of advantages, such as small density, elastic modulus is about half of steel, low coefficient of thermal expansion, non-magnetic, low thermal conductivity, corrosion resistance, no pollution to the environment and so on. Titanium alloy is not only widely used in aviation, aerospace, ships, weapons and chemical industry and other fields, but also as an automobile material has long attracted people's attention. Automotive titanium alloy can reduce the weight of light vehicles, reduce fuel consumption, improve work efficiency, improve the environment and reduce noise. However, the manufacturing cost of titanium alloy is much higher than that of steel, aluminum and other widely used metal materials. The higher preparation cost to some extent hinders its application in the civil field which is very sensitive to the cost. The automotive field is the most typical example. Titanium alloy will encounter high-speed impact and collision in the process of application, which requires titanium alloy to have excellent dynamic bearing capacity, and can still maintain the structural integrity and dimensional stability of its components under impact.
As a beta stabilizing element of titanium alloy, Fe is of low price. In the development of stabilizing elements to reduce alloying cost. The addition of Mo and Fe to Beta titanium alloy can accelerate the aging response speed and shorten the time required to reach the peak of aging strength. Cr was dissolved in α and β phases, and there were eutectic reactions. Cr mainly plays the role of solid solution strengthening, which can improve the plasticity, toughness and hardenability of the alloy. Cr can also refine the as-cast microstructure of the alloy. Compared with Mo, Cr has a more obvious refining effect, and the strengthening effect is better than Mo. Adding B element to the titanium alloy can effectively refine the as-cast microstructure and hinder the growth of refined grains in the subsequent processing process, so as to reduce the deformation and reduce the processing cost.
