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Influence of the microstructure on the plastic behaviour of duplex stainless steels

机译：显微组织对双相不锈钢塑性行为的影响

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摘要

Microstructure change of a (ferrite)+y (austenite) two-phase structure in duplex stainless steels deformed by hot torsion tests is briefly analyzed. Two types of stainless steels containing different volume fractions of ferrite and austenite were torsion deformed at temperatures ranging from 900 to 1250°C. Steel A (25.5Cr-4.9Ni-1.6Mo) contained Cr_(eq)/Ni_(eq)-4.8 and steel B (22.2Cr-5.6Ni-3Mo) contained Cr_(eq)/Ni_(eq) = 3.5 bring about different microstructures and flow stress behaviour. The results show that the shape of the flow stress curves depends on the material and on deformation conditions. Four different flow curve shapes were observed. At high temperatures, steel A displayed a plastic behaviour typical of ferritic stainless steels. As the deformation temperature decreased, the flow curves presented peak stresses at low-temperature deformation. When the austenite particles are distributed coarsely in the matrix (steel B), the plastic flow curve displays a stress peak separating extensive regions of hardening and softening. When both phases have the same volume fractions, the microstructure is characterized by percolation of the two phases in the samples, and the plastic flow curve takes on a very distinctive shape in hot torsion tests. The role of the microstructure present during deformation on the shape of the flow stress curves is analyzed.
机译：简要分析了通过热扭转试验而变形的双相不锈钢中（铁素体）+ y（奥氏体）两相组织的组织变化。两种含有不同体积分数的铁素体和奥氏体的不锈钢在900至1250°C的温度范围内发生扭转变形。钢A（25.5Cr-4.9Ni-1.6Mo）含Cr_eq / Ni_eq-4.8，钢B（22.2Cr-5.6Ni-3Mo）含Cr_eq / Ni_eq = 3.5不同的微观结构和流动应力行为。结果表明，流变应力曲线的形状取决于材料和变形条件。观察到四种不同的流动曲线形状。在高温下，钢A表现出铁素体不锈钢特有的塑性行为。随着变形温度的降低，流动曲线呈现出低温变形时的峰值应力。当奥氏体颗粒粗大地分布在基体（钢B）中时，塑性流动曲线显示出一个应力峰，将硬化和软化的广泛区域分开。当两相的体积分数相同时，微观结构的特征在于样品中两相的渗滤，并且在热扭转试验中塑性流动曲线呈现出非常独特的形状。分析了变形过程中存在的微观结构对流动应力曲线形状的作用。

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