2002
DOI: 10.1007/s11661-002-0358-0
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Origins of internal structure in massive transformation products

Abstract: The internal structure in massive phases formed during six massive transformations has been reviewed. A counterpart review has also been made for the proeutectoid ferrite reaction, mainly in alloy steels in which bulk partition of alloying elements between austenite and ferrite has not occurred. Both dislocations and twins comprise this structure unless the stacking fault energy is too high to permit twin formation. Volume and shape changes associated with transformation can explain dislocation loops through s… Show more

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Cited by 25 publications
(9 citation statements)
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“…So, the c fi a transformation in steels has been investigated extensively from both a technological point of view and a fundamental scientific point of view. [1][2][3][4][5][6][7][8][9] In general, the c fi a phase transformation of steels comprises three overlapping mechanisms: nucleation, growth, and impingement. Upon nucleation, a new interface is generated that separates the product ferrite phase from the parent austenite phase.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…So, the c fi a transformation in steels has been investigated extensively from both a technological point of view and a fundamental scientific point of view. [1][2][3][4][5][6][7][8][9] In general, the c fi a phase transformation of steels comprises three overlapping mechanisms: nucleation, growth, and impingement. Upon nucleation, a new interface is generated that separates the product ferrite phase from the parent austenite phase.…”
Section: Introductionmentioning
confidence: 99%
“…This interface migrates into the surrounding parent phase during the subsequent growth, and the migration rate of the interface principally is determined by the diffusion of alloying elements away from the interface and/or the mobility of the interface. [1,[4][5][6][7] The thus formed microstructure is influenced by the impingement of the growing ferritic particles. Hence, occurrence of various nucleation and growth mechanisms would bring diversity in the prevailing c fi a transformation mechanism and thereby the resulting microstructure (i.e., a transition from interfaced-controlled to diffusion-controlled growth in isothermal annealing, [10,11] as well as a transition from diffusion-controlled to interfacecontrolled growth in isochronal annealing, [12] were observed during the c fi a transformation in ultra-low carbon Fe-C alloys).…”
Section: Introductionmentioning
confidence: 99%
“…MODEL mal spacing of s, thus giving the well-known transformation strain yy ϭ Ϫb v /s inside the embryo of martensite (Figure It is commonly accepted now [7,78,79,84] that the fcc → hcp MT may start at sites of higher dislocation density, where 1(c)). Therefore, the elastic fields of the martensitic embryo are given by a simple superposition of elastic fields created the elements of dislocation structure have long-range elastic fields similar to the elastic fields of a superdislocation.…”
Section: Introductionmentioning
confidence: 99%
“…Two factors are responsible for the generation of defects: plastic deformation induced by volume and shape changes as well as growth accidents. [32][33][34] The phase transformation from d ferrite to the austenite causes volume shrinkage of about 1 pct. [32] Moreover, the d ferrite is harder than the austenite.…”
mentioning
confidence: 99%
“…Growth accidents may happen if these atoms are not placed on the lattice of the growing new phase according to the proper stacking sequence. [34][35][36] As a result, defects would be introduced into the new phase by the growth accidents. In the case of d fi c phase transformation, the c/d interfaces migrate into the d ferrite by the transfer of atoms from d ferrite.…”
mentioning
confidence: 99%