Enhancement of damage tolerance of 52100 bearing steel by influencing the static and dynamic cold working features due to defined stabilized retained austenite

通过定义稳定残余奥氏体影响静态和动态冷加工特性，提高 52100 轴承钢的损伤容限

• 批准号: 420401443
• 负责人: Professor Dr.-Ing. Tilmann Beck
• 金额: --
• 依托单位: Lehrstuhl für Werkstoffkunde (WKK)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/420401443?language=en
• 关键词: Enhancement; damage; tolerance; 52100; bearing

The aim of the planned research project is to develop a damage tolerant 52100 bearing steel (german steel grade 100Cr6). From a methodical point of view, a significant increase in local work hardening ability combined with high local stress resistance and good dimensional stability have to be implemented. The scientific hypothesis to reach this goal is a specific combination of alloy and heat treatment to adjust the retained austenite content, distribution and stability. Therefore the physical relationships in a technical material have to be understood and a depth knowledge on the underlying microstructural mechanisms has to be acquired. For this purpose the stabilizing mechanisms acting under cyclic stress and cyclic induced local transformation of retained austenite to martensite and their dependency on increased operating temperature have to be investigated. If the aim of the research project is reached, the identified materials variant has an enhanced damage tolerance compared to conventional bearing steels. The enhanced work hardening rate due to local phase transformation strengthens the matrix around e.g. crack tips and therewith avoids, inhibits and stops fracture. Simultaneously the tolerance of the material against internal defects increases, so that the cost intensive increase of material purity can be avoided.

计划的研究项目的目的是开发一种耐损伤的52100轴承钢（德国钢级100Cr6）。从方法的角度来看，必须实现局部加工硬化能力的显著增加以及高的局部抗应力性和良好的尺寸稳定性。达到这一目标的科学假设是合金和热处理的特定组合，以调整残余奥氏体的含量，分布和稳定性。因此，必须了解技术材料中的物理关系，并深入了解潜在的微观结构机制。为此，必须研究在循环应力和循环诱导的残余奥氏体向马氏体的局部转变及其对增加的操作温度的依赖性下起作用的稳定机制。如果达到研究项目的目标，与传统轴承钢相比，所确定的材料变体具有更高的损伤容限。由于局部相变引起的增强的加工硬化速率增强了例如裂纹尖端周围的基体，从而避免、抑制和阻止断裂。同时，材料对内部缺陷的耐受性增加，从而可以避免材料纯度的成本密集型增加。