316L不锈钢的三维晶粒与晶界形貌特征及尺寸分布

doi:10.11900/0412.1961.2017.00318

金属学报

2018, Vol. 54

Issue (6): 868-876 DOI: 10.11900/0412.1961.2017.00318

本期目录 | 过刊浏览

316L不锈钢的三维晶粒与晶界形貌特征及尺寸分布

刘廷光^1,²(

), 夏爽², 白琴², 周邦新²

1 北京科技大学国家材料服役安全科学中心北京 100083
2 上海大学材料科学与工程学院上海 200072

Morphological Characteristics and Size Distributions of Three-Dimensional Grains and Grain Boundaries in 316L Stainless Steel

Tingguang LIU^1,²(

), Shuang XIA², Qin BAI², Bangxin ZHOU²

1 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
2 School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

引用本文:

刘廷光, 夏爽, 白琴, 周邦新. 316L不锈钢的三维晶粒与晶界形貌特征及尺寸分布[J]. 金属学报, 2018, 54(6): 868-876.
Tingguang LIU, Shuang XIA, Qin BAI, Bangxin ZHOU. Morphological Characteristics and Size Distributions of Three-Dimensional Grains and Grain Boundaries in 316L Stainless Steel[J]. Acta Metall Sin, 2018, 54(6): 868-876.

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摘要:

使用连续截面法结合三维电子背散射衍射(3D-EBSD)技术研究了316L不锈钢的三维显微组织,重点分析了晶粒和晶界的三维形貌特征及各特征参数的分布规律,包括晶粒尺寸、晶粒表面积、晶粒的晶界面数、晶界尺寸和晶粒的平均晶界尺寸,并统计分析了各特征参数之间的关系。结果表明：316L不锈钢的三维晶粒和三维晶界的形貌特征参数均服从对数正态分布,各参数与晶粒尺寸之间的关系符合幂函数。另外,由于存在大量孪晶,造成316L不锈钢的三维晶粒形貌十分复杂,且尺寸越大的晶粒形貌越复杂,晶界面数越多,表面积越大,与等轴晶的偏离也越大。

关键词 ： 316L不锈钢, 三维电子背散射衍射, 三维显微组织, 三维晶粒, 三维晶界

Abstract：

Three-dimensional characterization of grains and grain boundaries is significant to study the microstructure of polycrystalline materials, and is the key to advance the subject of three-dimensional materials science (3DMS). In this work, the technique of serial sectioning by mechanical polishing coupled with 3D electron backscatter diffraction (3D-EBSD) mapping was used to measure the microstructure of a 316L stainless steel in 3D. Volume of the collected 3D-EBSD microstructure is 600 μm×600 μm×257.5 μm, which is quite large to study the 3D microstructure of structural materials with conventional grain size (20~60 μm). Dream3D and in-house developed Matlab programs were used to process the 3D-EBSD data, and subsequently ParaView was used to visualize the grains and grain boundaries in 3D. Combined usage of these tools and in-house programs make the possibility that not only 3D grains but also 3D grain boundaries can be studied in both morphology and quantification. In total, 1840 grains and 9177 grain boundaries are included in the measured 3D-EBSD microstructure. The 3D morphological characteristics and size distributions of grains and grain boundaries in the 316L stainless steel were investigated, including 3D grain size, grain surface area, boundary quantity per grain, grain boundary size and the average boundary size per grain, as well as relationships between these morphological parameters were discussed. Results showed that distributions of all of these morphological parameters of 3D grains and grain boundaries in the polycrystalline 316L steel can be well represented by log-normal distribution, and all relationships of these parameters versus grain size can be well represented by power function. Additionally, the 3D morphologies of most grains in the 316L stainless steel deviate from the ideal equiaxed grains, having complex shapes due to existing of twins, such as semi-sphere shaped, plate shaped and some very complex grains. In many ways, the larger grains have more complex morphology with greater number of faces, larger surface area and larger deviation from equiaxed grains.

Key words： 316L stainless steel 3D-EBSD 3D microstructure 3D grain 3D grain boundary

收稿日期: 2017-07-27

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目No.51671122和中央高校基本科研业务费专项资金项目No.FRF-TP-16-041A1

作者简介:

作者简介刘廷光,男,1986年生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00318 或 https://www.ams.org.cn/CN/Y2018/V54/I6/868

图1 3D-EBSD显微组织采集方法、3D重构图及其第101层2D EBSD图

图2 典型晶粒的3D形貌及该晶粒的4个晶界的3D形貌图

图3 3D晶粒尺寸分布及其对数正态分布拟合曲线

图4 3D晶粒的表面积分布及其对数正态分布拟合曲线,晶粒表面积与晶粒尺寸关系统计及其幂函数拟合曲线和球表面积曲线

图5 所测3D显微组织中一个形貌十分复杂的大尺寸晶粒(g101)和它的2个邻接晶粒(g1211和g1026)

图6 3D晶粒的晶界面数分布及其对数正态分布拟合曲线,晶粒的晶界面数与晶粒尺寸关系统计及其幂函数拟合曲线

图7 3D晶界尺寸(等效圆直径)分布及其对数正态分布拟合曲线

图8 3D晶粒的平均晶界尺寸分布及其对数正态分布拟合曲线,晶粒的平均晶界尺寸与晶粒尺寸关系统计及其幂函数拟合曲线

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