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日本三菱汽车工业公司开发出冷锻钛合金制阀簧承座,并在世界上首次应用于批量生产的小轿车用发动机上。钛合金制阀簧承座使用大同特殊钢公司生产的可冷锻的β型钛合金DAT51(Ti-22V-4A1)作材料,利用与钢制承座相同的工艺及锻模进行冷锻。先将材料机械加工成坯件,然后予以润滑处理并进行冷锻。为确保材料的耐磨性,进行表面氧化处理,即在大气中进行高温(800℃以上)加热,使材料表面形成厚约5μm的由TiO~2与TiO组成的氧化皮层,并通过氧的扩散在材料内部形成厚约200μm的硬化层。最表面的脆Tio~2层可用喷丸清理除去。经过氧
Japan’s Mitsubishi Motors Corporation has developed a cold-forged titanium alloy spring retainer, and for the first time in the world for mass production of car engines. Titanium alloy spring retainer is made of cold-forgeable β-type titanium alloy DAT51 (Ti-22V-4A1) manufactured by Datong Special Steel Co., and is cold forged using the same process and die as the steel retainer. The material is first machined into blanks, which are then lubricated and cold forged. In order to ensure the wear resistance of the material, a surface oxidation treatment is performed, that is, a high temperature (800 ° C or higher) heating in the atmosphere to form an oxide scale layer consisting of TiO 2 and TiO with a thickness of about 5 μm on the surface of the material, A hardened layer having a thickness of about 200 μm was formed inside the material. The most surface of the brittle Tio ~ 2 layers can be removed by shot peening. After oxygen