Abstract The so-called ausforming treatment consists in plastically deforming a fully austenitized steel below the recrystallization stop temperature, prior to either a martensitic or a bainitic transformation. Although this procedure is envisioned as a way to improve the mechanical response of the attained microstructure, it is not without its drawbacks, as the possibility of phase transformations occurring during the deformation step. When such step is applied at relatively higher temperatures than those of the aimed microstructure, the presence of those softer phases could be rather detrimental for the final microstructure. The current study aims to further study those phase transformations to analyze whether they are induced via either stress or strain and to identify the temperature ranges in which they tend to occur, so that they can be avoided or used to improve the final microstructure properties in the future. A final evaluation on the impact of these induced transformations on the final microstructure when deformation is followed by either cooling or an isothermal treatment is also performed.

中文翻译：

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锻压过程中应力或应变引起的马氏体和贝氏体转变

摘要 所谓的奥氏体成形处理包括在马氏体或贝氏体转变之前，使完全奥氏体化钢在再结晶停止温度以下发生塑性变形。尽管该过程被设想为一种改善所获得微观结构的机械响应的方法，但它并非没有缺点，因为在变形步骤期间可能发生相变。当在比目标微观结构的温度相对更高的温度下应用此类步骤时，这些较软相的存在可能对最终微观结构相当不利。目前的研究旨在进一步研究这些相变，以分析它们是通过应力还是应变引起的，并确定它们往往发生的温度范围，以便将来可以避免或使用它们来改善最终的微观结构性能。当变形后进行冷却或等温处理时，还对这些诱导转变对最终微观结构的影响进行了最终评估。