LOW-CYCLE FATIGUE OF THE SECOND GENERATION DIRECTIONALLY SOLIDIFIED SUPERALLOY
ZHANG ShiChao
LI Li
HOU XueQin
Abstract：The total strain-controlled low cycle fatigue(LCF) behaviors of a directionally solidified(DS) superalloy DZ406at 950℃ and 1000℃ for R =0.05 were investigated.The results of LCF tests indicated that mean stress relaxation occurred under asymmetric straining.The rate of mean stress relaxation increased with the increasing of strain amplitude.All the LCF data obtain under various ratios were well correlated by a modified SWT approach for lifetime prediction,the all data fell into the factor of 3 scatter band.With the increasing of strain amplitude it appeared muti-fatigue crack initiations.
Keywords：DS superalloyLow cycle fatigueStrain ratioMean stress relaxation
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 311-315 )