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http://dx.doi.org/10.12656/jksht.2019.32.4.161

Impact Toughness and Fracture Behavior in Non-Heat Treating Steels Containing Bainite  

Cho, Ki-Sub (Center for Advanced Materials Technology, kookmin University)
Kwon, Hoon (Center for Advanced Materials Technology, kookmin University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.32, no.4, 2019 , pp. 161-167 More about this Journal
Abstract
Impact toughness and fracture behavior were studied in five kinds of non-heat treating steels containing bainite; standard(0.25C-1.5Mn-0.5Cr-0.2Mo-0.15V), high V(0.3V), Ni(0.5Mn-2Ni), W(0.4W instead of Mo), and high C-Ni(0.35C-0.5Mn-2Ni) steels. The good hardness and impact toughness balance was exhibited in the $1100^{\circ}C$-rolled condition, while the impact toughness was deteriorated due to coarse grained microstructure in the $1200^{\circ}C$-rolled condition. The impact toughness decreased with increasing the hardness in all steels studied. The fracture behavior was also basically identical, that is, the fracture area was divided into 3 zones; shear and fibrous zone, fracture transition zone with ductile dimples and cleavage cracks, where the cracks initiate and grow to critical size, unstable cleavage fracture propagation zone. The energy absorbed for the critical crack formation through the plastic deformation inside the plastic zone in front of the notch root contributed to a mostly significant portion of the total impact energy.
Keywords
Non-heat treating steels; Fracture behavior; Bainite; Hot-rolling condition;
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Times Cited By KSCI : 1  (Citation Analysis)
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