Abstract
The martensite reaction in single crystals and polycrystals of 70 pct Fe-30 pct Ni alloys, is shown to be autocatalytic in nature, producing bursts of transformation during cooling. The temperature of the first burst of transformation, called M b , occurs below M s in these alloys. Experiments were devised to test the athermal embryo and strain embryo theories of martensite nucleation. The results indicate that internal strains, either within the virgin austenite or around existing martensitic plates, control the nucleation process in these alloys. Furthermore, the growth of martensitic plates is not limited by the attainment of an elastic balance with the austenitic matrix, but by the occurrence of plastic deformation at the martensite boundaries which interferes with the propagation mechanism.
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Discussion on this paper, TP 3127E, may be sent, 2 copies to AIME by Dec. 1, 1951. Manuscript, April 10, 1951. Detroit Meeting, October 1951.
This paper is based on a thesis submitted by E. S. Machlin in partial fulfillment of the degree of Doctor of Science in Metallurgy to the Massachusetts Institute of Technology, September 1950. The investigation was sponsored by the Office of Naval Research under Contract N5-ori-07814, Task No. XIV, Designation No. NR-031-142.
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Machlin, E.S., Cohen, M. Burst Phenomenon in the Martensitic Transformation. JOM 3, 746–754 (1951). https://doi.org/10.1007/BF03397387
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DOI: https://doi.org/10.1007/BF03397387