Introduction to titanium alloy spring
A spring is a special part whose stress is less than the elastic limit of the material, so the material is required to have a high elastic limit. The cause of spring failure is nothing more than internal factors and external factors. The internal factors are mainly the quality of the springs and the proper heat treatment, which directly affects the life of the spring. The external factors are mainly the spring wire and the surface quality of the strip. The microcracks on the surface of the wire, especially the surface corrosion pits, become a source of cracks, which cause the spring to break due to corrosion fatigue under varying working stresses.
Titanium alloy has a high specific strength and a low modulus of elasticity, making it an ideal spring material. Compared with steel springs, titanium springs have the advantages of light weight, small volume and high resonance frequency. Their density and elastic modulus are only half that of steel springs, and the strength is almost the same as that of steel springs. Due to these characteristics, in practical applications, the titanium spring can be designed to have a smaller diameter and a smaller number of turns than the steel spring. In the case of springs, high strength is the most important performance requirement for materials, so high-strength beta titanium alloys such as Ti-3Al-8V-6Cr-4M o-4Zr and Timetal LCB (Ti-6.8Mo-4.5Fe-1.5) Al) alloys are the best material for making springs. The use of a titanium spring instead of a steel spring can easily solve the problem that the steel spring that has long plagued the designer is too long and too large in diameter, and because the titanium alloy has excellent corrosion resistance, the coating can be eliminated, thereby further Reduce quality. At present, some sports cars have used titanium springs. For example, Timetal LCB springs have been used in Ford & Simon racing cars for more than 2 years, reducing the mass by about 36 kg.
Research on titanium alloys for springs has found that almost all titanium alloys can be used to make springs, but because of the low strength of α+β-based titanium alloys, β-type titanium alloys are easy to draw into wires, and aging treatment after forming can become High-strength materials, therefore, the most ideal titanium alloy spring material is the β-type titanium alloy.