以下为句子列表：
英文: Abstract: The effect of different carburizing programs on the microstructure and thick of carburized layer of screw bevel gears has been studied, meanwhile the fatigue life of these gears has also tested.
中文: 文摘:本文研究了不同渗碳淬火工艺对螺伞齿轮组织及渗层深度等影响，并对螺伞齿轮进行了台架疲劳测试。
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英文: With the help of X ray diffraction and optical microscopy,the phase structure of the plasma nitrocarburized layer of W8CrV high speed steel has been investigated. The brittleness of the layer is studied by continuous indent loading.
中文: 采用X射线衍射仪及光学显微镜分析了W8CrV高速钢离子氮碳共渗层的相结构，采用连续加载压入法研究了共渗层脆性。
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