Effects of microstructure on fracture toughness of a high-strength low-alloy steel |
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Authors: | M. T. Miglin J. P. Hirth A. R. Rosenfield |
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Affiliation: | (1) Babcock and Wilcox, 44601 Alliance, OH;(2) Metallurgical Engineering Department, The Ohio State University, 43210 Columbus, OH;(3) Battelle’s Columbus Laboratories, 43201 Columbus, OH |
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Abstract: | Fracture toughness and ductile-brittle transition behavior were measured for a copper-bearing HSLA steel. The value ofK lc for cleavage failure was independent of heat treatment, whileJ lc for ductile failure decreased monotonically with increasing strength level. With both failure modes, fracture appears to be controlled by cracking of sulfide inclusions. The decrease in ductile-failureJ lc is caused by decreased work-hardening rates that suppress cleavage and facilitate void coalescence. Both higher austenitizing temperature and quenching rate after austenitization influence the ductile/brittle transition temperature, either through grain-size and precipitate refinement or through an increase in the resistance of the steel to shear failure. Formerly Graduate Student, The Ohio State University |
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