NUCLEATION AND GROWTH OF FERROUS MARTENSITES

Acta Metall Sin

1991, Vol. 27

Issue (3): 19-26 DOI:

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NUCLEATION AND GROWTH OF FERROUS MARTENSITES

ZHANG Xiumu;LI Yiyi Institute of Metal Research; Academia Sinica; Shenyang

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ZHANG Xiumu;LI Yiyi Institute of Metal Research; Academia Sinica; Shenyang. NUCLEATION AND GROWTH OF FERROUS MARTENSITES. Acta Metall Sin, 1991, 27(3): 19-26.

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Abstract In situ observations of the nucleation and growth of ferrous marten-sites, including ε-, lenticular, butterfly, thin-plate and composite-plate ones at lowtemperature stage on optical or transmission electron microscope were carried out.The results confirmed the faulting model for the formation of ε-martensite proposedby Olson and Cohen. The grain boundaries and triple points are the favourable nu-cleation sites for the thin plates, and their surface relief grown initially like asmall needle. The lenticular martensite was observed as two stages of formation.According to the dislocation resolving reaction:a/6[111]_b→a/3[111]_b+a/2[111]_b, the emission dislocation(b=a/2[111]_b) acting as thedislocation soulce for the transition of lattice invariant shear from twinning to slipwas proposed.

Key words: martensite nucleation growth observation emission dislocation

Received: 18 March 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I3/19

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