Journal
SCIENCE
Volume 320, Issue 5879, Pages 1057-1060Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1156084
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Materials are typically ductile at higher temperatures and become brittle at lower temperatures. In contrast to the typical ductile- to- brittle transition behavior of body- centered cubic (bcc) steels, we observed an inverse temperature dependence of toughness in an ultrahigh- strength bcc steel with an ultrafine elongated ferrite grain structure that was processed by a thermomechanical treatment without the addition of a large amount of an alloying element. The enhanced toughness is attributed to a delamination that was a result of crack branching on the aligned {100} cleavage planes in the bundles of the ultrafine elongated ferrite grains strengthened by nanometer- sized carbides. In the temperature range from 60 degrees to -60 degrees C, the yield strength was greater, leading to the enhancement of the toughness.
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