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Modeling Application to Reduce Distortion of a Carburized and Quenched Steel Gear

机译：减少渗碳淬火钢齿轮变形的建模应用

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摘要

During quench hardening processes for steel components, both the thermal gradient and phase transformations in the part contribute to distortion and residual stresses in the final part. Most transmission gears have unbalanced geometry, which will cause a temperature difference from one region to another during quenching, aside from the temperature gradient from surface to core. The unbalanced temperature distribution in the part will lead to different phase transformation timing and final phase composition in the quenched part. The material volume expands with different ratios when austenite transforms to different phases at different temperatures. By modifying a quenching process, such as quenchant type, agitation, immersion direction and speed, the distortions of the final part are expected to be different. In this paper, the commercial heat treatment software, DANTE, is used to model the quenching process of a transmission gear. This transmission gear is gas carburized by using a boost/diffuse process, followed by an immersion oil quench process. The predicted carbon distribution and distortion are compared against the experimental measurements. The correlations between temperature, carbon distribution, phase transformation, and stress changes are described using the modeling results. The causes of distortion and residual stresses are discussed.
机译：在钢部件的淬火硬化过程中，零件中的热梯度和相变都会导致最终零件中的变形和残余应力。大多数传动齿轮具有不平衡的几何形状，除了从表面到铁心的温度梯度外，还会在淬火期间引起一个区域与另一个区域之间的温差。零件中不平衡的温度分布将导致淬火零件中的相变时间和最终相组成不同。当奥氏体在不同温度下转变为不同相时，材料体积以不同的比例膨胀。通过修改淬火工艺（例如淬火剂类型，搅拌，浸入方向和速度），可以预期最终零件的变形会有所不同。在本文中，使用商用热处理软件DANTE对传动齿轮的淬火过程进行建模。通过使用升压/扩散工艺对该传动齿轮进行渗碳，然后进行浸油淬火工艺。将预测的碳分布和变形与实验测量值进行比较。使用建模结果描述了温度，碳分布，相变和应力变化之间的相关性。讨论了变形和残余应力的原因。

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