Kinetics of f. c. c. [r arrow] b. c. c. heterogeneous martensitic nucleation; 2: Thermal activation

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90469-3· OSTI ID:6989830

Ghosh, G; Olson, G B ^[1]

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1. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering

A critical analysis of the experimental data for the activation energy for f.c.c. [r arrow] b.c.c. martensitic nucleation in Fe-Ni, Fe-Ni-C, Fe-Ni-Cr and Fe-Ni-Mn alloys has been performed employing the theory of dislocation discrete-obstacle interaction. It is shown that the normalized activation energy Q(T)/[mu](T) vs normalized driving force [Delta]g[sub n]/[Delta][cflx g] data for isothermal martensitic nucleation follows the general form proposed by Kocks, Argon and Ashby for the kinetics of conventional slip deformation in solid solution strengthened alloys. Curvature of the Q([Delta]g) function defines a temperature dependent activation volume for isothermal martensitic nucleation. The analysis is consistent with rate control by the interaction of solute atoms with the thermally-assisted motion of the martensitic interface. The contribution of a solute to the thermal component of interfacial friction is found to scale with its athermal contribution. The analysis incorporates kinetic data for the effects of applied elastic stress and plastic pre-strain, providing a quantitative estimate of the interfacial friction from dislocation forest hardening.

• DOE Contract Number: FG02-88ER45365
• OSTI ID: 6989830
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 42:10; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
IRON BASE ALLOYS
MANGANESE ALLOYS
NICKEL ALLOYS
BCC LATTICES
BINARY ALLOY SYSTEMS
CARBON ADDITIONS
FCC LATTICES
TERNARY ALLOY SYSTEMS
ALLOY SYSTEMS
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
IRON ALLOYS
PHASE TRANSFORMATIONS
360102* - Metals & Alloys- Structure & Phase Studies