Premium
A QUANTITATIVE METALLOGRAPHIC ASSESSMENT OF STRUCTURAL DEGRADATION OF TYPE 316 STAINLESS STEEL DURING CREEP‐FATIGUE
Author(s) -
HALES ROYDEN
Publication year - 1980
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1980.tb01383.x
Subject(s) - creep , materials science , scanning electron microscope , grain boundary , metallurgy , deformation (meteorology) , strain (injury) , optical microscope , composite material , microstructure , medicine
— Optical and scanning electron microscopy have revealed the existence of grain boundary cavities in a series of specimens which had been cyclically deformed in the strain range ±0.25% with hold times ranging from 0 to 1000 min. The way in which these defects increase in size and number has been measured and found to correlate with the creep strain accumulated during the hold periods. A further observation is that a critical amount of deformation is required before either fatigue or creep type damage is nucleated. These observations lead to an alternative method to the currently accepted linear damage summation rule for estimating a lower bound of the creep‐fatigue endurance.