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首页> 外文会议>International Conference on Recent Trends in Structural Materials >Effect of silicon on stability of austenite during isothermal annealing of low-alloy steel with medium carbon content in the transition region between pearlitic and bainitic transformation
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Effect of silicon on stability of austenite during isothermal annealing of low-alloy steel with medium carbon content in the transition region between pearlitic and bainitic transformation

机译：珠霉菌和贝氏体转化中碳含量中碳含量在低合金钢等温退火期间奥氏体稳定性的影响

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摘要

In a vast majority of steels, a prerequisite to successful heat treatment is the phase transformation of initial austenite to the desired type of microstructure which may consist of ferrite, pearlite, bainite, martensite or their combinations. Diffusion plays an important role in this phase transformation. Together with enthalpy and entropy, two thermodynamic quantities, diffusion represents the decisive mechanism for the formation of the particular phase. The basis of diffusion is the thermally-activated movement of ions of alloying and residual elements. It is generally known that austenite becomes more stable during isothermal treatment in the transitional region between pearlitic and bainitic transformation. This is due to thermodynamic processes which arise from the chemical composition of the steel. The transformation of austenite to pearlite or bainite is generally accompanied by formation of cementite. The latter can be suppressed by adding silicon to the steel because this element does not dissolve in cementite, and therefore prevents its formation. The strength of this effect of silicon depends mainly on the temperature of isothermal treatment. If a steel with a sufficient silicon content is annealed at a temperature, at which silicon cannot migrate by diffusion, cementite cannot form and austenite becomes stable for hours.
机译：在绝大多数的钢，以成功的热处理的一个先决条件是初始奥氏体的相变，其可以由铁素体，珠光体，贝氏体，马氏体或它们的组合的微结构的期望类型。扩散起着这一阶段转型的重要作用。连同焓和熵，二热力学量，扩散表示用于特定相的形成的决定性机制。扩散的基础是合金化和残留元素的离子的热激活运动。通常已知的是奥氏体的珠光体和贝氏体相变之间的过渡区域的等温处理期间变得更稳定。这是由于从钢的化学组合物，其产生热力学过程。奥氏体向珠光体或贝氏体的转变通常伴随着形成渗碳体。后者可以通过将硅在钢，因为该元素不溶解渗碳，因此，防止其形成被抑制。的硅的该效应的强度主要取决于等温处理的温度。如果具有足够的硅含量的钢的温度下，在该硅不能由扩散迁移进行退火，渗碳体不能形成和奥氏体数小时变得稳定。

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