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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Characterisation and Quantification of Complex Bainitic Microstructures in High and Ultra-High Strength Linepipe Steels
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Characterisation and Quantification of Complex Bainitic Microstructures in High and Ultra-High Strength Linepipe Steels

机译：高强度和超高强度管线钢中复杂贝氏体组织的表征和定量

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摘要

This paper provides a detailed description of complex bainitic microstructures obtained during the recent development of low carbon linepipe steels with strengths in the range of X100 to X120. New experimental techniques based on a high resolution FEG-SEM and EBSD have been used to characterise and quantify the mixture of ultrafine bainitic ferrite and nanosize second phases in these steels. It was found that the occurrence of incomplete transformation generates new, previously unexplored bainitic microstructures with a wealth of microstructural features that is beyond classification based on conventional concepts. Clear differences in distributions of boundary misorientations and effective grain size were noted between upper, lower and granular bainites. Based on these results a new classification scheme and definition of bainite is proposed.
机译：本文详细介绍了在最近开发的强度在X100至X120范围内的低碳管线钢中获得的复杂贝氏体组织。基于高分辨率FEG-SEM和EBSD的新实验技术已被用来表征和量化这些钢中超细贝氏体铁素体和纳米级第二相的混合物。发现不完全转变的发生产生了新的，以前未曾探索过的贝氏体微结构，其具有大量的微结构特征，这些特征超出了基于传统概念的分类。上，下和粒状贝氏体之间边界取向差和有效晶粒尺寸的分布存在明显差异。基于这些结果，提出了一种新的贝氏体分类方案和定义。

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