Internal Intensive Quenching: Optimal Heat Treatment for inaccessible component areas

内部强化淬火：对难以接近的部件区域进行最佳热处理

基本信息

批准号：
299152500
负责人：
Professor Dr.-Ing. Volker Schulze
金额：
--
依托单位：
Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/299152500?language=en
关键词：
Internal Intensive Quenching Optimal Heat

项目摘要

In the course of this project a method to increase the life time of hydraulic components under an interior high pressure loading is developed. Such components find intensive usage in modern fuel-injection systems and have to withstand a cyclic pressure up to 4000 bar. To further increase the efficiency of such components there is a trend towards higher pressures in future systems while at the same time the components advance to more and more filigree structures due to the overall vehicle mass reduction. To sustain those changes in applied pressure with an equal component life time the properties of the base material have to be tailored during the production process towards an optimal microstructure. Recent methods for the local strain hardening of bore walls like drifting or autofrettage are based on the introduction of compressive residual stresses and if applicable small strain hardening effects in the bore hole wall. Compared to thermal methods the impact of these mechanisms on the component lifetime is very limited. On the other side most of the established thermal methods, e. g. case hardening, have difficulties with small bore diameters due to the restricted accessibility of the targeted areas. Therefore in this project the focus is directed towards the control and modification of the microstructure, residual stresses and strain hardening in a modified intensive quenching process based on martensitic hardening. The development of this process includes the efficient inductive heating of the part to austenization temperature followed by a local quenching with a high pressure water-air mixture to achieve an optimal near surface state of the bore hole. The newly developed process should first be tested on simple through-holes and then be transferred on more application oriented drilling intersections.

在该项目的过程中，开发了一种在内部高压负载下增加液压成分寿命的方法。这样的组件在现代燃油注入系统中发现了大量用途，并且必须承受高达4000 bar的环状压力。为了进一步提高此类组件的效率，在将来的系统中有一种趋势，同时由于整体车辆质量减少了，该组件逐渐发展到越来越多的花丝结构。为了维持相同组件寿命的施加压力变化，基本材料的性能必须在生产过程中量身定制为最佳微观结构。孔壁（如漂流或自动翻转）局部应变硬化的最新方法是基于引入压缩残留应力，如果适用于孔孔壁中的小应力硬化效果。与热方法相比，这些机制对组件寿命的影响非常有限。在另一侧，大多数已建立的热方法，e。 g。由于目标区域的可及性限制，因此孔径较小的直径较小，孔硬化很难。因此，在这个项目中，重点是针对微观结构，残留应力和压力硬化的控制和修饰，基于Martensenitic硬化的修改密集淬火过程。该过程的开发包括对仪的零件的有效电感加热，然后用高压水 - 空气混合物进行局部淬火，以达到孔孔的最佳近表面状态。新开发的过程应首先在简单的整个孔上进行测试，然后在更面向应用的钻孔交叉点上转移。