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首页> 外文期刊>Materials Science and Engineering >In-situ observation of strain partitioning and damage development in continuously cooled carbide-free bainitic steels using micro digital image correlation
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In-situ observation of strain partitioning and damage development in continuously cooled carbide-free bainitic steels using micro digital image correlation

机译：用微量数字图像相关性地原位观察持续冷却碳纤维纤维钢中的应变分配和损伤开发

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摘要

In this article, we probe the strain partitioning between the microstructural features present in a continuously cooled carbide-free bainitic steel together with damage nucleation and propagation. These features mainly comprise of phases (bainitic ferrite, martensite, and blocky/thin film austenite), interfaces between them, grain size and grain morphology. A micro Digital Image Correlation (mu-DIC) technique in scanning electron microscope is used to quantify the strain distribution between these microstructural features. The results show a strong strain partitioning between martensite, bainitic ferrite and retained austenite that provides weak links in the microstructure and creates conditions for the crack initiation and propagation during deformation. Blocky austenite islands accommodate maximum local strains in the global strain range of 0-2.3% and undergo strain-induced austenite to martensite transformation governing the local strain evolution in the microstructure. However, the local strains are minimum in martensite regions during entire in-situ deformation stage. Narrow bainitic ferrite channels in between martensitic islands and martensite-bainitic ferrite interfaces are recognised as primary damage sites with high strain accumulation of 30 +/- 2% and 20 +/- 3% respectively, at a global strain of 9%. The inclination of these interfaces with the tensile direction also affects the strain accumulation and damage.
机译：在本文中，我们探讨了在连续冷却的无碳面包纤氏钢中存在的微观结构特征与损伤成核和繁殖之间的菌株分区。这些特征主要包括相阶段（贝氏体铁氧体，马氏体和块状/薄膜奥氏体），它们之间的界面，晶粒尺寸和晶粒形态。扫描电子显微镜中的微量数字图像相关（MU-DIC）技术用于量化这些微观结构特征之间的应变分布。结果表明，马氏体，贝氏体铁氧体和保留奥氏体之间的强应变分区，其在微观结构中提供弱链路，并在变形期间产生裂纹引发和传播的条件。块状奥氏体群岛在全球应变范围内的最大局部菌株0-2.3％，并进行应变诱导的奥氏体，以控制微观结构中局部应变进化的马氏体转变。然而，在整个原位变形阶段的马氏体区域中局部菌株是最小的。马氏体岛和马氏体 - 贝氏体铁氧体接口之间的狭窄贝氏体铁氧体频道被认为是初级损伤部位，分别具有高应变累积30 +/- 2％和20 +/- 3％，全球应变为9％。这些接口与拉伸方向的倾斜度也影响应变累积和损坏。

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