KINETICS OF FCC-]BCC HETEROGENEOUS MARTENSITIC NUCLEATION .2. THERMAL-ACTIVATION
KINETICS OF FCC-]BCC HETEROGENEOUS MARTENSITIC NUCLEATION .2. THERMAL-ACTIVATION
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DOI：
10.1016/0956-7151(94)90469-3
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发表时间：
1994-10-01
期刊：
影响因子：
--
通讯作者：
OLSON, GB
中科院分区：
文献类型：
--
作者：
GHOSH, G;OLSON, GB
对f. c. c--> b.c.c.活化能实验数据的批判性分析。采用位错离散-障碍相互作用理论研究了Fe-Ni、Fe-Ni-C、Fe-Ni-Cr和Fe-Ni-Mn合金中马氏体形核。示出了等温马氏体形核的归一化激活能Q（T）/mu（T）与归一化驱动力Δ g（n）/Δ g数据遵循Kocks，Argon和Ashby [在Thermodynamics and Kinetics of Slip，Progress in Materials Science，Vol.19. Pergamon Press，Oxford（1975）]，用于固溶体强化合金中常规滑移变形的动力学。Q（Δ g）函数的曲率定义了等温马氏体成核的温度依赖性激活体积。分析是一致的速率控制的溶质原子的相互作用与热辅助运动的马氏体界面。溶质的界面摩擦的热分量的贡献被发现规模与其非热贡献。该分析采用了动力学数据的影响，施加的弹性应力和塑性预应变，提供了一个定量的估计从位错森林硬化的界面摩擦。
A critical analysis of the experimental data for the activation energy for f.c.c --> 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 DELTAg(n)/DELTAg data for isothermal martensitic nucleation follows the general form proposed by Kocks, Argon and Ashby [in Thermodynamics and Kinetics of Slip, Progress in Materials Science, Vol. 19. Pergamon Press, Oxford (1975)] for the kinetics of conventional slip deformation in solid solution strengthened alloys. Curvature of the Q (DELTAg) 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.