Functionalized subsurface zone for load-oriented fatigue behavior of hardened components

用于硬化部件负载导向疲劳行为的功能化地下区域

• 批准号: 468005437
• 负责人: Professor Dr. Bernd Breidenstein
• 金额: --
• 依托单位: Institut für Maschinenkonstruktion und Tribologie (IMKT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468005437?language=en
• 关键词: Functionalized; subsurface; zone; load; oriented

Due to the worldwide economic and ecological development, the application of innovative technologies to protect the environment and conserve resources is necessary. Particularly in manufacturing technology, there is potential for process optimization that is not yet fully understood or fully exploited. For example, residual compressive stresses can be introduced by strengthening the component subsurface zone of cyclically stressed components. Their positive effects on fatigue life have been known for a long time. The residual stress depth can be influenced by an innovative hard turn-rolling process, in which the heat input generated by turning is used for a simultaneous deep rolling process. An application of the hard turn-rolling process to rolling bearings should result in longer bearing fatigue lives. Bench tests showed that a very high maximum and a large penetration depth of the residual compressive stresses alone could not incease bearing fatigue life. The reason for this could be the heat input into the component, which cannot be specifically controlled, and the resulting change in the component edge zone. In previous investigations, no holistic consideration of the component subsurface and its effects on component fatigue life was carried out. For the project applied for here, the working hypothesis is that heat input plays a decisive role in deep-rolling and that a holistic consideration of the component subsurface is necessary. The aim is to investigate the extent to which thermomechanical processing influences the subsurface as a whole and the extent to which individual properties of the subsurface, such as residual stresses, texture, microstructure and its strain hardening state, influence fatigue under cyclic loading and which cause-effect relationships exist. Based on this, optimized edge zone properties are to be defined, specifically adjusted and their positive influence on fatigue life has to be verified. In previous investigations, no holistic consideration of the component subsurface zone and its effects on component service life was carried out. For the project applied for here, the working hypothesis is that heat input plays a decisive role in deep rolling and that a holistic consideration of the component subsurface zone is necessary. The aim is to investigate the extent to which thermomechanical processing influences the subsurface zone as a whole and the extent to which individual properties of the subsurface zone, such as residual stresses, texture, microstructure and its strain hardening state, influence fatigue under cyclic loading and which cause-effect relationships exist. Based on this, optimized edge zone properties are to be defined, specifically adjusted and their positive influence on fatigue life verified.

由于全球经济和生态发展，必须应用创新技术来保护环境和保护资源。尤其是在制造技术中，尚未完全理解或完全利用的过程优化潜力。例如，可以通过加强周期性应力组件的组件地下区域来引入残留压力应力。他们对疲劳生活的积极影响已有很长时间了。残留应力深度可能会受到创新的硬转滚动过程的影响，在这种过程中，通过转动产生的热输入用于同时进行深层滚动过程。艰难的转弯过程在滚动轴承中的应用应导致更长的轴承寿命。台式测试表明，仅残留压缩应力的最大最大和较大的穿透深度就无法使疲劳寿命失毒。这样做的原因可能是无法具体控制的组件中的热量输入，以及组件边缘区域的结果变化。在先前的研究中，没有对组件地下的整体考虑及其对组件疲劳寿命的影响。对于此处应用的项目，工作假设是热输入在深度滚动中起决定性的作用，并且需要对组件地下的整体考虑。目的是研究热机械处理影响整个地下的程度以及地下的各个特性在多大程度上，例如残留应力，纹理，微结构及其应变硬化状态，会影响环状负荷下的疲劳以及存在因果关系。基于此，必须定义优化的边缘区域特性，具体调整，并且必须验证它们对疲劳寿命的积极影响。在先前的研究中，没有对组件地下区域及其对组件使用寿命的影响进行全面考虑。对于此处适用的项目，工作假设是热输入在深层滚动中起决定性作用，并且需要对组件地下区域进行整体考虑。目的是研究热力学处理在多大程度上影响整个地下区域以及地下区域的各个特性在多大程度上，例如残留应力，纹理，微结构及其应变硬化状态，会影响环状负荷下的疲劳以及存在原因。基于此，应定义优化的边缘区域特性，具体调整并对其对疲劳寿命的积极影响进行了验证。