Strunk Rebecca, Borchers Florian, Clausen Brigitte, Heinzel Carsten
Leibniz-Institute for Materials Engineering-IWT, Badgasteiner Str. 3, 28359 Bremen, Germany.
MAPEX Center for Materials and Processes, Faculty of Production Engineering, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany.
Materials (Basel). 2021 May 4;14(9):2386. doi: 10.3390/ma14092386.
To generate advanced properties for the wear resistance and fatigue life of components and allow for an improved, application-oriented development of part specifications, a precisely tailored initial machining or manufacturing process is necessary. In addition, it is important to know how subsequent machining steps or operational loads affect the components' condition. Residual stresses are a meaningful measurand for evaluating the modifications that a machining process induces into the material. The desired modifications should be specified regarding the final state for the required operational behavior. Thus, the stability of the modifications can be considered so that they can be beneficial in service. This investigation is part of fundamental research in the field of the Collaborative Research Center (CRC) "Process Signatures". By applying defined selected loads, the effects on machined surface layers are investigated since machined components are exposed to further loads during use. For this reason, experimental process chains are applied in this work to grind-strengthened specimens as possible application cases and corresponding loads. These experimental process chains consist of defined mechanical and thermal loads, which are applied to the specimens using a thermal and mechanical testing system. Furthermore, it is investigated how these additional loads affect the modifications previously introduced by the grinding process. The influence of the additional loads is evaluated by using radiographic and electron microscopic examinations. It can be observed that the sequence, as well as the type of the applied loads, play a significant role in the development of the modifications.
为了生成部件耐磨性和疲劳寿命的先进性能，并实现面向应用的部件规格改进开发，精确定制的初始加工或制造工艺是必要的。此外，了解后续加工步骤或运行载荷如何影响部件状态也很重要。残余应力是评估加工工艺在材料中引起的变化的一个有意义的测量量。应根据所需运行行为的最终状态指定所需的变化。因此，可以考虑这些变化的稳定性，以便它们在使用中有益。这项研究是“过程特征”合作研究中心领域基础研究的一部分。通过施加定义的选定载荷，研究其对加工表面层的影响，因为加工后的部件在使用过程中会承受进一步的载荷。因此，在这项工作中应用实验过程链来处理磨削强化试样，作为可能的应用案例和相应的载荷。这些实验过程链由定义的机械和热载荷组成，使用热机械测试系统施加到试样上。此外，还研究了这些附加载荷如何影响先前由磨削过程引入的变化。通过射线照相和电子显微镜检查评估附加载荷的影响。可以观察到，施加载荷的顺序以及类型在变化的发展中起着重要作用。
