NDLI: A transformation toughening white cast iron

Content Provider	Springer Nature Link
Author	HANN, S. K GATES, J. D
Copyright Year	1997
Abstract	An experimental white cast iron with the unprecedented fracture toughness of 40 MPa m1/2 is currently being studied to determine the mechanisms of toughening. This paper reports the investigation of the role of strain-induced martensitic (SIM) transformation. The dendritic microconstituent in the toughened alloy consists primarily of retained austenite, with precipitated M7C3 carbides and some martensite. Refrigeration experiments and differential scanning calorimetry (DSC) were used to demonstrate, firstly, that this retained austenite has an "effective" sub-ambient MS temperature and, secondly, that SIM transformation can occur at ambient temperatures. Comparison between room temperature and elevated temperature KIc tests showed that the observed SIM produces a transformation toughening response in the alloy, contributing to, but not fully accounting for, its high toughness. SIM as a mechanism for transformation toughening has not previously been reported for white cast irons. Microhardness traverses on crack paths and X-ray diffraction (XRD) on fracture surfaces confirmed the interpretation of the KIc experiments. Further DSC and quantitative XRD showed that, as heat-treatment temperature is varied, there is a correlation between fracture toughness and the volume fraction of unstable retained austenite.
Starting Page	1249
Ending Page	1259
Page Count	11
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	32
Issue Number	5
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Materials Science Characterization and Evaluation Materials Mechanics Crystallography Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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