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首页> 外文会议>New developments on metallurgy and applications of high strength steels >MICROMECHANICS ANALYSIS OF APPLIED STRESS EFFECTS UPON DIFFUSIONAL FERRITE NUCLEATION IN AUSTENITE
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MICROMECHANICS ANALYSIS OF APPLIED STRESS EFFECTS UPON DIFFUSIONAL FERRITE NUCLEATION IN AUSTENITE

机译：奥氏体中弥散铁素体形核施加应力作用的微观力学分析

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摘要

In a quest for developing ultra fine-grained ferrite steels, an external stress is often applied to control the austenite-to-ferrite transformation kinetics. To understand the role of applied stress in diffusional ferrite nucleation, a micromechanics analysis is performed in this work. It is well known that austenite-to-ferrite transition accompanies a volume increase up to nine percent. In the past, impact of such a volume change on the transformation kinetics was not seriously analyzed. The calculation due to the volume change alone shows that a coherent ferrite particle has a strain energy less in the Nishiyama-Wasserman (NW) orientation than in the Kurdjumov-Sachs (KS) orientation, and preferred shapes of NW oriented ferrite particles are disk-like, acicular, and spherical in the order. When an applied elastic stress is introduced, there arise two kinds of elastic strain energies in addition to the energy due to the applied stress itself. The first one is an inhomogeneity term due to the difference in the elastic constants between fcc and bcc Fe, and the other is an interaction term between the volume change and the applied stress. The interesting feature of the austenite elastic constants – high bulk modulus but soft shear modulus – combined with the strong elastic anisotropy of ferrite reveals diverse influence of applied stress upon the energetics of ferrite formation. In certain applied stress modes, both inhomogeneity and interaction energy term are found to lower the free energy of the ferrite particle, promoting enhanced ferrite nucleation.
机译：为了开发超细晶粒铁素体钢，经常施加外部应力以控制奥氏体到铁素体的转变动力学。为了了解施加应力在扩散铁素体形核中的作用，在这项工作中进行了微力学分析。众所周知，奥氏体到铁素体的转变伴随着高达百分之九的体积增加。过去，这种体积变化对转化动力学的影响尚未得到认真分析。仅由于体积变化而进行的计算表明，相干铁氧体颗粒在Nishiyama-Wasserman（NW）取向上的应变能比Kurdjumov-Sachs（KS）取向小，并且NW取向的铁氧体颗粒的优选形状是圆盘形。像，针状和球形的顺序。当引入施加的弹性应力时，除了由于施加的应力本身引起的能量之外，还产生两种弹性应变能。第一个是由于fcc和bcc Fe之间的弹性常数不同而引起的不均匀项，另一个是体积变化与施加应力之间的相互作用项。奥氏体弹性常数的有趣特征–高体积模量但软剪切模量–与铁素体的强弹性各向异性相结合，揭示了施加应力对铁素体形成高能的多种影响。在某些外加应力模式下，非均质性和相互作用能项均会降低铁素体颗粒的自由能，从而促进铁素体成核作用的增强。

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