当前位置: X-MOL 学术Acta Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Application of Spherical Indentation and the Materials Knowledge System Framework to Establishing Microstructure-Yield Strength Linkages from Carbon Steel Scoops Excised from High-Temperature Exposed Components
Acta Materialia ( IF 9.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.actamat.2017.11.024
Almambet Iskakov , Yuksel C. Yabansu , Sudhir Rajagopalan , Anna Kapustina , Surya R. Kalidindi

Abstract Industrial power generation turbines operate at elevated temperatures for prolonged periods of time (around 100,000 h) which leads to significant microstructure evolution and mechanical property changes. Due to physical and structural constraints of operational turbines, only small scoop samples can be excised from heat-exposed steel components. Scoop samples at various service time intervals provide valuable information on microstructure changes, for example on graphite formation in carbon steels, with increasing service time. However, mechanical evaluation of such small material volumes poses significant challenges using conventional tests. A novel spherical microindentation technique is applied to evaluate a library of scoop samples ranging between 0 and 99,000 h of service. Furthermore, microstructure and yield strength data for the different exposure periods is used to construct a structure-property (S-P) linkage using the MKS homogenization approach that employs spatial correlations, principal component analysis, and regression techniques. The accuracy of the extracted S-P linkage was assessed on new samples that were not included in the calibration set.

中文翻译:

球形压痕和材料知识系统框架在从高温暴露部件上切除的碳钢勺建立微观结构-屈服强度联系中的应用

摘要 工业发电涡轮机在高温下长时间运行(约 100,000 小时),这会导致显着的微观结构演变和机械性能变化。由于运行涡轮机的物理和结构限制,只能从热暴露的钢部件中切取小勺样品。不同服务时间间隔的勺状样品可提供有关微观结构变化的宝贵信息,例如随着服务时间的增加,碳钢中石墨的形成。然而,使用传统测试对如此小的材料体积进行机械评估带来了重大挑战。一种新颖的球形显微压痕技术用于评估服务时间在 0 到 99,000 小时之间的勺状样品库。此外,使用采用空间相关性、主成分分析和回归技术的 MKS 均质化方法,使用不同暴露期的微观结构和屈服强度数据构建结构-性能 (SP) 联系。对未包含在校准集中的新样品评估提取的 SP 连锁的准确性。
更新日期:2018-02-01
down
wechat
bug