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中文摘要：
设计合适的锻压坯料是保证锻压后锻件具有良好综合性能的基础,通过改进锻压坯料的尺寸来改善锻件各部位的变形程度以获得具有良好组织及性能的锻件。运用有限元模拟软件Deform-3D模拟联接轴等温模锻过程,对不同尺寸的坯料模拟等温锻造过程,随着坯料在Z向厚度尺寸的增加,模锻后锻件的等效应变随之逐渐增加。选择成形效果较佳且模锻后锻件变形程度逐渐增加的锻压坯料进行实验。对热处理后的等温模锻件进行室温拉伸、硬度、电导率、疲劳以及金相实验检测。结果显示：对于横截面沿长轴突变的联接轴锻件,锻件各部位间性能差异较大;等温模锻后,变形程度大的锻件能够获得更好的微观组织和力学性能。
英文摘要：
Designing suitable forging preform is a prerequisite for the good comprehensive performance after forging. Therefore, a forging workpiece with good mierostructure and properties is obtained by improving the preform dimension and the deformation degrees on its various positions. Then, the isothermal die forging processes of coupling shaft with different preform sizes were simulated by the finite element simulation software Deform -3D, and the equivalent strain of forging workpiece increased gradually with the increase of the thickness in the Z-direction. Furthermore, the preforms with better forming shape and gradual increase of forging deformation degree after forging were selected to test, and the isothermal die forgings after heat treatment were tested by the room temperature tensile, hardness, electrical conductivity, fatigue and metallographic tests. The experimental results show that the difference of performance in different positions of the forging workpiece is big for coupling shaft forging workpiece with abrupt change in the cross section along the long axis. After the isothermal die forging, better microstructure and mechanical properties of forging workpiece can he obtained by a larger deformation degree.
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