LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature

摘要：

　　Low cycle fatigue (LCF) tests of single crystal nickel-based superalloy DD6 were conducted with different crystallographic orientations (i.e.001, 011 and 111) and strain dwell types (i.e.tensile, compressive and balanced types) at one certain high temperature.Due to the material anisotropy and mean stress, both orientation factor and stress range were introduced to Smith, Watson & Topper (SWT) stress model for predicting the fatigue life.The experimental results indicate that the fatigue properties of DD6 are dependent on both crystallographic orientation and loading types.Compared with continuous cycling tests without strain dwell, the tensile, compressive and balanced strain dwell tests lead to shorter lives.The predicted results of the modified SWT stress method proposed agree well with the experimental data.

关键词： Single crystal superalloy Low cycle fatigue Crystallographic orientation Strain dwell Life prediction

作者: Zhihua Zhang Huichen Yu Chengli Dong

作者单位: Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China

会议类型: 国际会议

会议名称: 2015 International Symposium on Structural Integrity(2015年国际结构完整性学术会议)

会议地点: 沈阳

会议语种:英文

页码: 107-112

在线出版日期: 2015-05-16（万方平台首次上网日期，不代表论文的发表时间）