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首页> 外文期刊>Metals >Effect of the Temperature in the Mechanical Properties of Austenite, Ferrite and Sigma Phases of Duplex Stainless Steels Using Hardness, Microhardness and Nanoindentation Techniques
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Effect of the Temperature in the Mechanical Properties of Austenite, Ferrite and Sigma Phases of Duplex Stainless Steels Using Hardness, Microhardness and Nanoindentation Techniques

机译：温度对硬度，显微硬度和纳米压痕技术对双相不锈钢奥氏体，铁素体和西格玛相力学性能的影响

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摘要

The aim of this work is to study the hardness of the ferrite, austenite and sigma phases of a UNS S32760 superduplex stainless steel submitted to different thermal treatments, thus leading to different percentages of the mentioned phases. A comparative study has been performed in order to evaluate the resulting mechanical properties of these phases by using hardness, microhardness and nanoindentation techniques. In addition, optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) have been also used to identify their presence and distribution. Finally, the experimental results have shown that the resulting hardness values were increased as a function of a longer heat treatment duration which it is associated to the formation of a higher percentage of the sigma phase. However, nanoindentation hardness measurements of this sigma phase showed lower values than expected, being a combination of two main factors, namely the complexity of the sigma phase structure as well as the surface finish (roughness).
机译：这项工作的目的是研究经过不同热处理的UNS S32760超双相不锈钢的铁素体，奥氏体和sigma相的硬度，从而导致上述相的百分比不同。为了通过使用硬度，显微硬度和纳米压痕技术评估这些相的最终机械性能，已经进行了比较研究。此外，光学显微镜，扫描电子显微镜（SEM）和X射线衍射（XRD）也已用于鉴定它们的存在和分布。最后，实验结果表明，所得到的硬度值随着热处理时间的延长而增加，这与较高百分比的σ相形成有关。但是，此sigma相的纳米压痕硬度测量值低于预期，是两个主要因素的组合，即sigma相结构的复杂性以及表面光洁度（粗糙度）。

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