Multiphase-field modeling of martensitic phase transformation in a dual-phase microstructure
Multiphase-field modeling of martensitic phase transformation in a dual-phase microstructure
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DOI：
10.1016/j.ijsolstr.2017.10.032
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发表时间：
2017-11
影响因子：
3.6
通讯作者：
Ephraim Schoof;D. Schneider;D. Schneider;Nick Streichhan;Tobias Mittnacht;M. Selzer;M. Selzer;B. Nestler;B. Nestler
中科院分区：
文献类型：
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作者：
Ephraim Schoof;D. Schneider;D. Schneider;Nick Streichhan;Tobias Mittnacht;M. Selzer;M. Selzer;B. Nestler;B. Nestler
铁素体-马氏体双相钢 (DP) 为工业应用提供有益的材料特性。了解生产链内的微观结构演变及其对机械特性的影响，可以通过改变特定的工艺参数来改善材料性能。除了实验之外，数值方法也是探索这些相关性的有用工具。为此，我们提出了一个弹性多相场模型来研究 DP 微观结构中的马氏体相变。对收到的商用 DP600 成品带材进行 EBSD 扫描，用于生成虚拟的初始铁素体-奥氏体微观结构。基于初始多晶微观结构，所应用的多相场模型能够预测奥氏体晶粒中马氏体变体的演化，包括晶界和自催化成核。该方法将平行或垂直于马氏体变体惯习平面的晶界识别为首选成核位点。我们讨论由此产生的应力分布并显示其与残余奥氏体的相关性。
Ferritic-martensitic dual-phase steels (DP) offer beneficial material properties for industrial applications. Understanding the microstructural evolution within the production chain and its consequences for the mechanical characteristics allows to improve the material properties by changing specific process parameters. In addition to experiments, numerical methods are a helpful tool to explore these correlations. For this purpose, we present an elastic multiphase-field model to study the martensitic phase transformation in a DP microstructure. An EBSD scan of an as-received commercial DP600 finished strip is used to generate a virtual, initial ferritic-austenitic microstructure. Based on the initial polycrystalline microstructure, the applied multiphase-field model is able to predict the evolution of the martensitic variants in austenitic grains, including grain boundary and autocatalytic nucleation. The approach identifies grain boundaries lying parallel or perpendicular to the habit plane of martensitic variants as preferred nucleation sites. We discuss the resulting stress distribution and show its correlations to retained austenite.