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部分采用钛合金材料的某型发动机为了改进性能,压气机2、3级转子叶片。改用TC6钛合金,4、5、6级转子叶片改用TC9钛合金。但是,钛合金的机械加工比较困难,尤其是在热处理过程中因高温氧化形成的污染层,质地坚硬很难切削。在970℃挤压出来的TC9钛合金叶片污染层厚度在0.12～0.15毫米左右;在950℃挤压出来的TC6钛合金叶片污染层厚度在0.22～0.25毫米左右。测定这些钛合金污染层的最外层显微硬度相当于HRC59左
Part of the engine with a titanium alloy material In order to improve performance, the compressor 2, 3 rotor blades. Switch to TC6 titanium alloy, 4,5,6 rotor blades to use TC9 titanium alloy. However, titanium machining is difficult, especially in the heat treatment process due to the formation of high temperature oxidation layer, the hard texture is difficult to cut. TC9 titanium alloy extruded at 970 ℃ out of the contaminated layer thickness of 0.12 ~ 0.15 mm; extruded at 950 ℃ TC6 titanium alloy leaf contamination layer thickness of about 0.22 ~ 0.25 mm. The outermost layer of these titanium alloy contaminants was measured for microhardness equivalent to HRC 59 left