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A general mechanism of martensitic nucleation: Part I. General concepts and the FCC → HCP transformation
Gregory B. Olson,Morris Cohen +1 more
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In this paper, the stacking fault energy is shown to consist of both volume energy and surface energy contributions, and when the volume energy contribution is negative, the fault energy decreases with increasing fault thickness such that fault energy associated with the simultaneous dissociation of an appropriate group of dislocations can be zero or negative.Abstract:
Consideration of the martensitic nucleation process as a sequence of steps which take the particle from maximum to minimum coherency leads to the hypothesis that the first step in martensitic nucleation is faulting on planes of closest packing. It is further postulated that the faulting displacements are derived from an existing defect, while matrix constraints cause all subsequent processes to occur in such a way as to leave the fault plane unrotated, thus accounting for the observed general orientation relations. Using basic concepts of classical nucleation theory, the stacking fault energy is shown to consist of both volume energy and surface energy contributions. When the volume energy contribution is negative, the fault energy decreases with increasing fault thickness such that the fault energy associated with the simultaneous dissociation of an appropriate group of dislocations (e.g. a finite tilt boundary segment) can be zero or negative. This condition leads to the spontaneous formation of a martensitic embryo. For the specific case of the fcc → hcp martensitic transformation in Fe-Cr-Ni alloys, the defect necessary to account for spontaneous embryo formation at the observedM
s temperatures may consist of four or five properly spaced lattice dislocations. Such defects are considered to be consistent with the known sparseness of initial martensitic nucleation sites.read more
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Effects of carbon addition on microstructure and mechanical properties of Fe50Mn30Co10Cr10 high-entropy alloy prepared by powder metallurgy
TL;DR: In this paper , the effects of carbon content on microstructural evolution and mechanical properties of the as-sintered Fe50Mn30Co10Cr10 high entropy alloy (HEA) were investigated.
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In Situ TEM Observation on Martensitic Transformation during Tensile Deformation of SUS304 Metastable Austenitic Stainless Steel
TL;DR: Through in situ transmission electron microscopy observation on SUS304 metastable austenitic stainless steel during stretching at room temperature, it was found that e martensite plates were induced preferentially from the sites of dislocation pile-ups as mentioned in this paper.
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Work hardening behavior and tensile properties of a high-Mn damping steel at elevated temperatures
TL;DR: In this article, a dual-phase high-Mn damping steel was tensile deformed at elevated temperatures to conduct a comprehensive study about the effects of transformation-induced plasticity (TRIP), twinning-induced Plasticity (TWIP), dynamic strain aging (DSA), and dislocation slip (DS) on its work hardening behavior and tensile properties.
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Modeling of plasticity-induced martensitic transformation to achieve hierarchical, heterogeneous, and tailored microstructures in stainless steels
TL;DR: In this article, an elasto-plastic self-consistent modeling framework incorporating a strain-induced austenite-to-martensite transformation kinetic sub-model is calibrated using a set of stainless steels data from the literature to capture stress-strain response and volume fraction of phases.
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The mechanism of thermal transformation hysteresis in ZrO2-CeO2 shape-memory ceramics
TL;DR: In this article, thermal hysteresis of the tetragonal-monoclinic martensitic transformation in ZrO2-CeO2 SMCs is studied.
References
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The Determination of the Elastic Field of an Ellipsoidal Inclusion, and Related Problems
TL;DR: In this paper, it is shown that to answer several questions of physical or engineering interest, it is necessary to know only the relatively simple elastic field inside the ellipsoid.
Book
Theory of Dislocations
John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
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The scientific papers
TL;DR: Physical and psychosocial factors associated with psychostimulant use in a nationally representative sample of French adolescents: Specificities of cocaine, amphetamine, and ecstasy use are studied.
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The crystallography of martensite transformations II
J.S Bowles,J.K Mackenzie +1 more
TL;DR: In this paper, the total strain in a martensite transformation was derived from the orientation relationship and the component strains, together with the correspondence, and the dimensions of the initial and final structures.
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