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| ON THE DISLOCATION SLIP MECHANISM OF THE MARTENSITIC TRANSFORMATION OF STEELS |
| Lin Baojun (Nei Monggol Institute of Metallic Materials; Baotou; Nei Monggol Autonomous Region) |
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Cite this article:
Lin Baojun (Nei Monggol Institute of Metallic Materials; Baotou; Nei Monggol Autonomous Region). ON THE DISLOCATION SLIP MECHANISM OF THE MARTENSITIC TRANSFORMATION OF STEELS. Acta Metall Sin, 1982, 18(3): 350-394.
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Abstract With the aid of TEM observation on the martensite transformation of three steels, the relative position changes between atoms caused by the dislocation slip during fcc→bcc (or bet)lattice variation are mainly carried through shears in combination with different slip systems along<112>_f/{111}_f in the distorted fee lattice. Two types of these changes are: (1) the atom displacement of main shear only along one slip system of (1/m)<112>_f/{111}_f and (2)M=(1/n)[<112>_(f1)/{111}_(f1)+<112>_(f2)/{111}_(f2)] complex displacement obtained by all dislocations operated in different {111}_f conjugate sIip plane (n>6). Thus, an atom displacement mechanism of which the austenite transforms into martensite through conjugate complex slips of partial dislocation during quenching has been proposed. Based upon this mechanism, the crystalline geometry explanation may be undoubtedly made on the orientation correlation between matensite and austenite matrix, as well as the martensite habit planes and some special phenomena in quenched martensite.
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Received: 18 March 1982
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