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Micromechanisms of Dynamic Crack Propagation in an AISI 4340 Steel

Godse, R. and Ravichandran, G. and Clifton, R. J. (1989) Micromechanisms of Dynamic Crack Propagation in an AISI 4340 Steel. Materials Science and Engineering A, 112 . pp. 79-88. ISSN 0921-5093. http://resolver.caltech.edu/CaltechAUTHORS:20150225-154649661

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Abstract

The present work is aimed at understanding the micromechanisms of dynamic crack growth at room temperature and a low temperature (−100°C) in an AISI 4340 steel studied by Ravichandran and Clifton. For this purpose, a fractographic and metallographic examination of the specimens used by Ravichandran and Clifton was carried out. Results showed that the steel contained an appreciable amount of upper bainite (about 15%). The study suggests that dynamic crack propagation in the 4340 steel occurs in two stages, i.e. nucleation of microcracks in the upper bainite followed by propagation of these microcracks into the surrounding martensite. At low temperatures, failure of the martensite occurs by cleavage whereas, at room temperature, it occurs by shear localization, leading to microvoid growth and coalescence. At both temperatures, bainitic microcracks serve as failure initiation sites and reduce the dynamic fracture toughness of the steel.


Item Type:Article
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http://dx.doi.org/10.1016/0921-5093(89)90346-8 DOIArticle
http://www.sciencedirect.com/science/article/pii/0921509389903468PublisherArticle
Additional Information:© 1989 Elsevier Sequoia. Received July 18, 1988; in revised form November 10, 1988. This research was supported by the Army Research Office. Central facilities support was provided through the National Science Foundation Materials Research Group at Brown University.
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Army Research Office (ARO)UNSPECIFIED
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Record Number:CaltechAUTHORS:20150225-154649661
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150225-154649661
Official Citation:R. Godse, G. Ravichandran, R.J. Clifton, Micromechanisms of dynamic crack propagation in an AISI 4340 steel, Materials Science and Engineering: A, Volume 112, June 1989, Pages 79-88, ISSN 0921-5093, http://dx.doi.org/10.1016/0921-5093(89)90346-8. (http://www.sciencedirect.com/science/article/pii/0921509389903468)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55218
Collection:CaltechAUTHORS
Deposited By: Cheryl Gause
Deposited On:02 Mar 2015 23:19
Last Modified:29 Sep 2016 23:17

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