Determination of fatigue lives and origin of crack initiation of steel piston alloys in the VHCF regime at elevated temperatures (T02*)

高温下 VHCF 状态下钢活塞合金的疲劳寿命和裂纹萌生起源的测定 (T02*)

• 批准号: 325196373
• 金额: --
• 依托单位: Institut für Werkstofftechnik
• 依托单位国家: 德国
• 项目类别: Collaborative Research Centres (Transfer Project)
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/325196373?language=en
• 关键词: Determination; fatigue; lives; origin; crack

Based on the knowledge gained in the subproject C04 during the first funding period of the CRC 920, the aim of the present proposal is to evaluate the fatigue properties of steel piston alloys in the application relevant temperature range between 200°C and 500°C up to 109 number of cycles. The investigations are focussed on the influence of materials production conditions (cast andwrought alloys), the chemical composition, the microstructure and defects like (pores, micro shrinkage cavities, non-metallic inclusions). Especially, investigations on the damage relevant defect size as well as damage accumulation are of great interest. The expected results can contribute to the clarification of occurring damage mechanisms in steel piston alloys at elevated temperatures and give finally a contribution to a modified design of piston geometries. Furthermore, results on the formation of damage relevant inclusion agglomerates can improve the entrapment capability of metal melt filters developed in the framework of the CRC 920 bymodification of the coating on the surface of filter struts.

基于CRC 920第一个资助期子项目C04所获得的知识，本提案的目的是评估钢活塞合金在200°C至500°C至109次循环的应用相关温度范围内的疲劳性能。研究的重点是材料生产条件（铸造和变形合金）、化学成分、显微组织和缺陷（气孔、微缩孔、非金属夹杂物）的影响。特别是对损伤相关缺陷尺寸和损伤累积的研究引起了人们极大的兴趣。预期的结果有助于澄清钢活塞合金在高温下发生的损伤机制，并最终为改进活塞几何形状的设计做出贡献。此外，研究结果表明，在CRC 920框架下开发的金属熔体过滤器中，与损伤相关的夹杂团块的形成可以通过对滤板表面涂层的改性来提高其包裹能力。