Predicting elastic anisotropy of dual-phase steels based on crystal mechanics and microstructure
Predicting elastic anisotropy of dual-phase steels based on crystal mechanics and microstructure
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DOI：
10.1016/j.ijmecsci.2018.12.021
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发表时间：
2019-02-01
影响因子：
7.3
通讯作者：
Knezevic, Marko
中科院分区：
文献类型：
--
作者：
Cantara, Aaron M.;Zecevic, Milovan;Knezevic, Marko
这项工作利用平均场自洽和全场快速傅立叶变换为基础的均匀化，研究几种钢的有效弹性行为：三个双相（DP），DP 590，DP 980和DP 1180，和一个马氏体（MS），MS 1700。这些钢的晶体织构和相分数的特点是使用电子显微镜沿着与电子背散射衍射初始化模型。一套全面的杨氏模量和泊松比的数据，在环境温度下测量的取向相对于每个钢板的轧制方向的函数，用于校准和验证模型。模型的校准使我们能够估计马氏体相和铁素体的单晶弹性常数，同时计算与取向相关的有效性质。一半的数据用于校准。随后的预测取向依赖的有效弹性性能的剩余数据验证了估计的单晶性能是可靠的。由于钢在其有效行为中表现出不同程度的各向异性，因此良好的预测使我们能够讨论织构、晶粒结构、相分数和分布对有效性能的作用。这项工作的结果代表了一个显着的激励，引入弹性各向异性的数值工具，用于模拟金属成形过程的双相钢，特别是那些涉及回弹的过程，使用纹理通知晶体力学为基础的模型，以更准确地估计有效的弹性性能所需的这种模拟。
This work utilizes mean-field self-consistent and full-field fast Fourier transform-based homogenizations to study the effective elastic behavior of several steels: three dual-phase (DP), DP 590, DP 980, and DP 1180, and one martensitic (MS), MS 1700. Crystallographic textures and phase fractions of these steels are characterized using electron microscopy along with electron-backscattered diffraction to initialize the models. A comprehensive set of Young's modulus and Poisson's ratio data, measured at the ambient temperature as a function of orientation with respect to the rolling direction for each steel sheet, is used to calibrate and validate the models. The calibration of the models enabled us to estimate the single crystal elastic constants for both the martensitic phase and ferrite, while calculating the orientation dependent effective properties. Half of the data was used in the calibration. Subsequent predictions of the orientation dependent effective elastic properties for the remaining data verified that the estimated single crystal properties are reliable. As the steels exhibit a different level of anisotropy in their effective behavior, good predictions allowed us to discuss the role of texture, grain structure, phase fraction and distribution on the effective properties. The results of this work represent a significant incentive to introduce elastic anisotropy in numerical tools for simulating metal forming processes of dual-phase steels, in particular those processes involving springback, using the texture informed crystal mechanics-based models to more accurately estimate the effective elastic properties required by such simulations.