Titanium Alloy Connecting Rod

The density of titanium alloy connecting rod metal is 4 5g/cm3. Only 58% of steel materials. The tensile strength of titanium is low, only 250-300MPa. During production, alloy elements should be added to strengthen the matrix, usually aluminum and sand. From the test results, the fatigue strength of titanium alloy with yield strength below 850MPa is proportional to the yield strength; However, for titanium alloys with yield strength above 850MPa, fatigue strength and yield strength become limit states. Free cutting elements such as sulfur and rare earth are usually added to titanium alloys, but when the yield strength is above 850MPa, the addition will reduce the fatigue performance of the alloy under high load. Japan uses Ti-3AI 2V titanium alloy to produce connecting rods. Its tensile strength can reach 800MPa and yield strength can reach 600MPa, equivalent to the strength level of 45 quenched and tempered steel. The mass of titanium alloy connecting rod is 30% less than that of steel connecting rod, which greatly reduces the reciprocating inertia force of connecting rod. The engine speed of titanium alloy connecting rod is 700r/min higher than that of steel connecting rod engine, which greatly increases the output power, and significantly reduces engine noise, which is beneficial to environmental protection.

The titanium alloy connecting rod is the most effective for reducing the weight of the engine, greatly improving the fuel efficiency and reducing the exhaust volume. Compared with the steel connecting rod, the weight can be reduced by 15% - 20%. The new Italian Ferrari 3.5L V8 and Acura NSX engines used titanium alloy connecting rods for the first time. The connecting rod is mainly made of Ti-6A1-4V Ti-10V-2Fe-3Al. Ti-4AI-4Mo-Sn-0.SSi 4,4; ftlL dn Ti-4Al-2si-4Mn. Ti-7M-4Mo f is also under development.

Titanium is mainly used in automobiles in two categories. The first category is to reduce the mass of reciprocating parts of internal combustion engines (for reciprocating parts of internal combustion engines, it is important to reduce the mass by even a few grams); The second category is used to reduce the total vehicle mass. According to the design and material characteristics, titanium is mainly distributed on the engine components and chassis components of the new generation of automobiles. In the engine system, titanium can be used to make valves, valve springs, valve spring seats and titanium alloy connecting rods; The chassis components are mainly spring, exhaust system, axle shaft and fastener.

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