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http://dx.doi.org/10.12656/jksht.2014.27.3.133

Effect of Microstructures on Cleavage Fracture Strength in Bainitic and Martensitic Steels  

Lee, Chang-Hoon (Korea Institute of Materials Science)
Publication Information
Journal of the Korean Society for Heat Treatment / v.27, no.3, 2014 , pp. 133-140 More about this Journal
Abstract
Cleavage fracture behaviors were investigated in Ni-Mo-Cr steels with mixed microstructure of lower bainite and martensite. As the size of carbide decreased, the cleavage fracture strength increased, which was independent of the sizes of grain and packet. The measured cleavage fracture strengths were in good agreement with cleavage fracture strengths calculated by Petch model rather than by modified Griffith model in micro-structures with fine carbides, the size of which were small below a few hundred nanometer.
Keywords
Cleavage fracture; Fine carbide; Bainite and martensite; Petch model;
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