This work aimed to understand the relationship between gliding behavior of dislocations and reversed evolution of dislocation structures in pure body-centered cubic metals, using automotive-grade interstitial-free steels under strain ratio (R) = 0 for case studies. The corresponding dislocation structures for εmax = 0.2 and 1.2% were loop-patch structure and dislocation-cell structure, respectively. However, dislocation cells were converted into loop-patch structures and the gilding behavior of dislocations would have changed from the original multiple-slips to single-slip when the εmax was reduced from 1.2 to 0.2%.

Reversed Evolution of Dislocation Structures during High–Low Strain-Controlled Fatigue for Interstitial-Free Steel. C.C.Shih, N.J.Ho, H.L.Huang: Materials Science and Engineering A, 2009, 526[1-2], 197-200