Statistical Analysis and Reliability Prediction of Creep Rupture Strength and Life for DZ125 Superalloy
This paper presents the reliability analysis of the creep rupture strength and long-term life of a directionally solidified nickel-base superalloy, DZ 125, which is widely used for manufacturing turbine blades of advanced aeroengines.A number of creep rupture experiments of DZ 125 alloy are carried out at 760℃, 850℃, 980℃ and 1040℃.Larson-Miller (L-M for short) parameter is used to predict the long-term creep life and a master curve in the L-M parameter is obtained.A Z-parameter model is employed to characterize the magnitude of the deviation of the creep rupture data to a master curve.The Z-parameter of DZ125 alloy followed Gaussian distribution which is verified by Chi-square testing.Based on the Z-parameter model, the curves of Stress-TTP (i.e.Time-temperature parameter)-Reliability, Stress-Life-Reliability and Allowable Stress-Temperature-Reliability are obtained to predict the creep rupture strength and life for DZ125 alloy.
reliability creep life directionally solidified superalloy master curve Z-parameter
Chengli Dong Ying Li Huichen Yu
Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Science and Technology on Advanced High Temperature Structural Materials Laboratory,AVIC Beijing Institute of Aeronautical Materials,Beijing 100095,China
国际会议
2014 International Symposium on Structural Integrity,ISSI2014(2014国际结构完整性学术会议)
兰州
英文
367-372
2014-08-20（万方平台首次上网日期，不代表论文的发表时间）