Effect of Pre-creep Time on Creep Life of Nickel-based Single Crystal Superalloy CMSX-4

Abstract

Abstract The effect of overheating with different time on creep life and strain curve of CMSX-4 nickel-based single crystal superalloy was studied. The overheating tests at different temperatures and stresses were carried out. The tests results showed that the duration of the second stage of creep would be reduced when the overheating happened at the beginning of the creep test. The deformation of the alloy quickly entered the third stage of creep, which obviously reduces the creep life and total strain of the material. When the overheating occurs in the second stage of creep, the rate of strain would increase after overheating and then the total creep life decreased. When the overheating was introduced at the beginning of the creep tests, the strain accumulation during the overheating was greater than that in the second stage of creep. However, the rate of strain after the overheating at the beginning is lower than that in the second stage of creep.