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首页> 外文会议>Eighth International Fatigue Congress Vol.3, Jun 3-7, 2002, Stockholm, Sweden >MICROSTRUCTURAL BARRIERS TO THE SHORT CRACK PROPAGATION IN TWO PHASE MATERIALS AND LOW CYCLE FATIGUE BEHAVIOUR OF AGED DUPLEX STEELS
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MICROSTRUCTURAL BARRIERS TO THE SHORT CRACK PROPAGATION IN TWO PHASE MATERIALS AND LOW CYCLE FATIGUE BEHAVIOUR OF AGED DUPLEX STEELS

机译：双相钢在两相材料中的裂纹扩展和微循环疲劳行为的微观结构障碍

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摘要

The classical approach to the problem of microstructural barriers limited to the properties of interfaces and of the misorientation between adjacent grains does not allow to interpret the experimental data from fatigue tests in α/γ duplex stainless steels. In DSS, the fatigue resistance is very sensitive to the individual properties of a and y phases, which can be modified by nitrogen alloying and/or by heat treatments. In a commercial SAF 2507 duplex steel, a sharp decrease of the fatigue life at high applied plastic strains can be observed after ageing at 475℃. A generalised model of microstructural barriers is applied to explain qualitatively this "anomalous" behaviour. The model emphasises the role of physical properties, of the degree of deformation in grains of both phases and of the nucleation site of short cracks in a cluster of grains including the first and the second microstructural barrier.
机译：对于限制界面性能和相邻晶粒之间取向错误的微观结构壁垒问题的经典方法无法解释来自α/γ双相不锈钢疲劳试验的实验数据。在DSS中，抗疲劳性对a相和y相的各个属性非常敏感，可以通过氮合金化和/或热处理来改变。在商品化的SAF 2507双相钢中，在475℃时效后，在高施加的塑性应变下，疲劳寿命会急剧下降。应用微观结构障碍的通用模型来定性地解释这种“异常”行为。该模型强调了物理特性，两相晶粒的变形程度以及包括第一和第二微观结构障碍在内的一簇晶粒中短裂纹成核位点的作用。

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