Electron Backscatter Diffraction Patterns from Titanium-added Interstitial-free Steel Containing Subgrains

Associated Publications Bennett IV, T.J. and Taleff, E.M. Dynamic Grain Growth Driven by Subgrain Boundaries in an Interstitial-Free Steel During Deformation at 850 °C. Metall Mater Trans A 55, 429–446 (2024). https://doi.org/10.1007/s11661-023-07256-w. Bennett IV, T.J. and Taleff, E.M. Imaging and Segmenting Grains and Subgrains using Backscattered Electron Techniques. Under review (2024). Data Description These data were collected by Thomas J. Bennett IV on July 28, 2022. The electron backscatter diffraction (EBSD) data and associated electron backscatter diffraction patterns (EBSPs) contained herein were acquired from a titanium-added interstitial-free (Ti-IF) steel sheet material containing numerous subgrains. The Ti-IF steel specimen that provided these data was ramped to 850 degrees Celsius over 30 minutes, held at this temperature for one hour, and then deformed at a constant true-strain rate of 10^-4 s^-1. Upon reaching a final true strain of 0.225, the specimen was air quenched while maintaining a constant stress to preserve subgrains formed during high-temperature deformation. The tensile specimen was cut from a Ti-IF steel sheet received in a hard as-rolled condition with the tensile axis parallel to the sheet rolling direction. EBSPs were acquired from a section cut from the center of the deformed gage region using a JEOL JSM-IT300HR SEM equipped with an EDAX Velocity EBSD camera at the Center for Integrated Nanotechnologies. The following conditions were used for EBSD data acquisition: Accelerating Voltage: 20 kV Beam Current: 80% Working Distance: 20.0 mm Magnification: 200× Dynamic Focus: 44 (out of 255, arbitrary units) Specimen Tilt: 70 degrees Scanning Grid Type: Square Step Size (x and y): 0.5 μm Scan Size: 520 (across) × 340 (down) pixels EBSD Camera Resolution: 446 × 446 pixels EBSD Camera Binning: 1 × 1 EBSD Camera Exposure Time: 10 ms Frame Averaging: None Specimen Tensile Direction: Horizontal Specimen Rolling Direction: Horizontal Specimen Long Transverse Direction: Vertical Specimen Short Transverse Direction: Normal to plane Pattern Center (EMSphInx Convention): (x_pc, y_pc, L) = (-0.2 pixels, 112.76 pixels, 21736.4 μm) EBSD Camera Elevation Angle: 3 degrees EBSD Camera Screen Width: 32 mm Pixel size on EBSD Camera Screen: 71.749 μm/pixel ( = 32000 μm / 446 pixels) Note: Conversions between different pattern center conventions may be found in the journal article below or at the following link: https://github.com/EMsoft-org/EMsoft/wiki/DItutorial. Jackson, M.A., Pascal, E., and De Graef, M. Dictionary Indexing of Electron Back-Scatter Diffraction Patterns: a Hands-On Tutorial. Integr Mater Manuf Innov 8, 226–246 (2019). https://doi.org/10.1007/s40192-019-00137-4. File Descriptions Specimen_orientation.pdf - A schematic showing specimen reference directions and the orientation used for EBSD data acquisition. Patterns.zip - A compressed archive containing Patterns.up2. This file contains 16-bit EBSPs and is 70,336,697,616 bytes (70.3 GB) uncompressed. SHT_Indexed.ang - A file containing orientation data produced by indexing Patterns.up2 using EMSphInx. Orientations are represented by Euler angles (Bunge convention) and are to be interpreted using the EDAX Setting 2 convention (see MTEX documentation at https://mtex-toolbox.github.io/EBSDReferenceFrame.html). SHT_Indexed.h5 - A file in HDF5 format containing orientation data and other relevant information produced by indexing Patterns.up2 using EMSphInx. SHT_Indexed_IPFmap.png - An image of an inverse pole figure map colored with respect to the short transverse direction showing the data from SHT_Indexed.ang. Note: The basic format of "up2" files is the following. The first 4 bytes provide the version number. The second 4 bytes are the width of the patterns. The third 4 bytes are the height of the patterns. The fourth 4 bytes are the starting position of the pattern image data. Acknowledgments The authors gratefully acknowledge support from the National Science Foundation under Grant DMR-2003312 and instrumentation under Grant DMR-9974476. The authors also gratefully acknowledge support from the U.S. Department of Energy, Office of High Energy Physics under Grant DE-SC0009960. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Los Alamos National Laboratory (Contract 89233218CNA000001) and Sandia National Laboratories (Contract DE-NA-0003525). The authors thank Mr. Thomas Cayia (Arcelor Mittal) for providing the interstitial-free steel material used for this study.关联出版物 Bennett IV, T.J. 与 Taleff, E.M. 《850℃变形条件下无间隙钢中亚晶界驱动的动态晶粒长大》，发表于《Metall Mater Trans A》55卷，429–446页（2024年）。DOI: 10.1007/s11661-023-07256-w。 Bennett IV, T.J. 与 Taleff, E.M. 《利用背散射电子技术实现晶粒与亚晶的成像与分割》，正在同行评议（2024年）。 数据说明 本数据集由Thomas J. Bennett IV于2022年7月28日采集。 本文包含的电子背散射衍射（Electron Backscatter Diffraction, EBSD）数据及配套电子背散射衍射花样（Electron Backscatter Diffraction Patterns, EBSPs）采自含有大量亚晶的钛添加无间隙原子（titanium-added interstitial-free, Ti-IF）钢板材。本数据集对应的Ti-IF钢试样经30分钟升温至850℃，保温1小时后，以10^-4 s^-1的恒定真应变率进行变形。当最终真应变为0.225时，对试样进行空气淬火，并维持恒定应力以保留高温变形过程中形成的亚晶。拉伸试样取自硬态轧制供货的Ti-IF钢板，其拉伸轴与板材轧制方向平行。EBSPs采自变形标距段中心截取的截面，采集设备为集成于JEOL JSM-IT300HR型扫描电子显微镜（Scanning Electron Microscope, SEM）的EDAX Velocity EBSD相机，实验地点为集成纳米技术中心（Center for Integrated Nanotechnologies）。 EBSD数据采集参数如下： 加速电压：20 kV 束流：80% 工作距离：20.0 mm 放大倍数：200× 动态聚焦：44（范围0~255，任意单位） 试样倾角：70° 扫描网格类型：正方形 步长（x、y方向）：0.5 μm 扫描尺寸：520（横向）×340（纵向）像素 EBSD相机分辨率：446×446像素 EBSD相机分箱（Binning）模式：1×1 EBSD相机曝光时间：10 ms 帧平均：无 试样拉伸方向：水平 试样轧制方向：水平 试样长横向方向：垂直 试样短横向方向：垂直于试样平面 花样中心（采用EMSphInx Convention约定）：(x_pc, y_pc, L) = (-0.2 像素, 112.76 像素, 21736.4 μm) EBSD相机仰角：3° EBSD相机屏幕宽度：32 mm EBSD相机屏幕像素尺寸：71.749 μm/像素（= 32000 μm / 446 像素） 备注：不同花样中心约定之间的转换方法可参阅下述期刊论文或以下链接：https://github.com/EMsoft-org/EMsoft/wiki/DItutorial。 参考文献：Jackson, M.A., Pascal, E. 与 De Graef, M. 《电子背散射衍射花样的字典索引：实操教程》，发表于《Integr Mater Manuf Innov》8卷，226–246页（2019年）。DOI: 10.1007/s40192-019-00137-4。 文件说明 Specimen_orientation.pdf：包含试样参考方向及EBSD数据采集所用取向的示意图。 Patterns.zip：压缩归档文件，内含Patterns.up2。该文件存储16位EBSPs，未压缩时大小为70,336,697,616 字节（70.3 GB）。 SHT_Indexed.ang：通过EMSphInx对Patterns.up2进行索引后得到的取向数据文件。取向以欧拉角（Bunge约定）表示，需采用EDAX Setting 2标准进行解读（详见MTEX文档：https://mtex-toolbox.github.io/EBSDReferenceFrame.html）。 SHT_Indexed.h5：采用HDF5格式存储的文件，包含通过EMSphInx索引Patterns.up2得到的取向数据及其他相关信息。 SHT_Indexed_IPFmap.png：以短横向方向为基准着色的反极图（Inverse Pole Figure, IPF），展示SHT_Indexed.ang中的数据。 备注：up2文件的基本格式如下：前4字节为版本号；接下来4字节为花样宽度；再接下来4字节为花样高度；最后4字节为花样图像数据的起始位置。 致谢 作者衷心感谢美国国家科学基金会（National Science Foundation）通过DMR-2003312项目及DMR-9974476项目提供的仪器支持。作者同时感谢美国能源部高能物理办公室通过DE-SC0009960项目提供的资助。本研究部分工作依托集成纳米技术中心（Center for Integrated Nanotechnologies）完成，该中心是由洛斯阿拉莫斯国家实验室（合同号89233218CNA000001）和桑迪亚国家实验室（合同号DE-NA-0003525）为美国能源部科学办公室运营的科学用户设施。作者感谢安赛乐米塔尔（Arcelor Mittal）公司的Thomas Cayia先生为本研究提供的无间隙原子钢试样。