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Application Analysis of Titanium Alloy in Automobile Industry

Titanium alloy parts currently have the following more commonly used.


1, the engine connecting rod


Titanium is ideal for connecting rods. Engine made of titanium alloy connecting rod can effectively reduce engine quality, improve fuel efficiency and reduce emissions. Compared to the steel connecting rod, titanium link can reduce the quality of 15% to 20%. The application of the titanium alloy link was first demonstrated on the new Italian Ferrari sedan 3.5LV8 and the Acura NSX engine. Ti-6Al-4V, Ti-10V-2Fe-3Al, Ti-3Al-2.0V and Ti-4Al-4Mo-Sn-0.5Si are the main materials used for the titanium alloy connecting rod. Other titanium alloy materials such as Ti -4Al-2S i-4Mn and Ti-7M-4Mo rod in the application is also under development.


2, the engine valve


Automotive engine valves made of titanium alloy not only reduce quality and extend service life, but also reduce fuel consumption and increase vehicle reliability. Titanium valve compared with the steel valve, the quality can be reduced by 30% to 40%, the engine speed limit can be increased by 20%. For the current application, the material of the intake valve is mainly Ti-6Al-4V, and the material of the exhaust valve is mainly Ti-6242S. Usually, Sn and Al are added together to obtain lower brittleness and less High strength; Mo addition can improve the heat treatment of titanium alloys, strengthening the strength of quenching and aging titanium alloy, while increasing the hardness. Other titanium alloys with potential for growth include:


3, valve spring seat


High strength and fatigue resistance is the valve spring seat must have the performance, beta titanium alloy heat treatment alloy, by solution treatment aging to obtain high strength, the corresponding more suitable material Ti · 15V-3Cr- 3Al-3Sn and Ti-15Mo-3Al-2.7Nb-0.2Si. Mitsubishi Motors uses Ti-22V-4Al titanium alloy valve spring seat in its large-scale production vehicles to reduce the mass of 42% compared with the original steel lock, the valve mechanism reduces the inertial mass by 6%, and the maximum engine speed increases 300r / min.


4, titanium alloy spring


Titanium and its alloys have a lower modulus of elasticity relative to the steel material and a larger value of σs / E, making it suitable for making elastic elements. Compared with the steel automobile spring, under the premise of the same elastic work, the height of the titanium spring is only 40% of the steel spring, and the mass is only 30-40% of that of the steel spring, which is convenient for the body design. In addition, titanium alloy excellent fatigue properties and corrosion resistance can improve the service life of the spring. At present, titanium alloy materials that can be used to manufacture automotive springs are Ti-4.5Fe6.8Mo-1.5Al and Ti-13V11C-3Al.


5, turbocharger


Turbochargers can improve the combustion efficiency of the engine and enhance the power and torque of the engine. Turbocharger turbine rotors need long-term work in the high temperature exhaust gas above 850 ℃, so require good heat resistance. Traditional light metals, such as aluminum, can not be used because of their low melting point. Although ceramic materials are used on turbine rotors due to their light weight and high temperature resistance, their application is limited due to their high cost and unspecified shape. In order to solve these problems, Tetsui et al. Developed the TiAl turbine rotor. After several experiments, it has not only good durability and performance, but also improved engine acceleration. This design has been successfully commercialized on the Mitsubishi Lancer Evolution line of vehicles.


6, exhaust system and muffler


Titanium is heavily used in the exhaust system of a car. Exhaust systems made of titanium and its alloys not only increase reliability, extend life and improve appearance, but also reduce quality and fuel burn efficiency. Titanium exhaust system compared with the steel exhaust system, the quality can be reduced by about 40%. In the Go1f series of cars, the quality of titanium exhaust system can be reduced by 7 ~ 9kg, the current titanium exhaust system used mainly for industrial titanium.


Titanium muffler quality is only 5 ~ 6kg, lighter than stainless steel muffler. 2000 Chevrolet CorvetteZ06 car with a 11.8kg titanium muffler and exhaust pipe system to replace the original 20kg stainless steel system, reducing the quality of 41%. The strength of the system after replacement will not change, making the car faster, more flexible and saving fuel. Mufflers used titanium is also mainly industrial titanium.


7, the body frame part


In order to improve the safety and reliability of vehicles, consideration needs to be given to the design and manufacture, especially the manufacturing of materials. Titanium is a very good material for making bodywork frames, which not only have a high strength but also have good toughness. In Japan, automakers chose pure titanium welded pipe to make a body frame that would give motorists enough safety when driving.


8, other titanium parts


In addition to the above components, titanium is also used in engine rockers, suspension springs, engine piston pins, automotive fasteners, hanging ears nuts, car door into the beam, car stop bracket, brake caliper piston, pin bolt, pressure Board, speed buttons and automotive clutch disc and other automotive parts.