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前言在国内外的汽车制造工业中,钢材的淬透性已成为制造汽车齿轮、选择钢种和制定热处理工艺的重要依据之一。如日本和西德等国,制定了钢材的淬透性标准,建立了“H”钢系列。对精密复杂的齿轮,将钢材的淬透性控制在较窄的范围内,以控制齿轮的变形,使大量生产的汽车齿轮具有较高的精度。为了摸清20CrMnTi钢的淬透性对齿轮工艺、热处理变形及使用寿命的影响,以及为国
Preface At home and abroad in the automobile manufacturing industry, the hardenability of steel has become an important basis for the manufacture of automotive gears, steel selection and the development of heat treatment process. Such as Japan and West Germany and other countries, developed a steel hardenability standards, the establishment of the “H” steel series. For complex and complicated gears, the hardenability of the steel is controlled within a narrow range to control the deformation of gears and to make the mass production of automobile gears with high precision. In order to find out the hardenability of 20CrMnTi steel gear technology, heat treatment deformation and service life, as well as for the country