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微米级选区激光熔化316L不锈钢拉伸变形中Σ3n特殊晶界的分布

张楠, 张海武, 王淼辉, 杜兵, 张平, 张志豪

张楠, 张海武, 王淼辉, 杜兵, 张平, 张志豪. 微米级选区激光熔化316L不锈钢拉伸变形中Σ3n特殊晶界的分布[J]. 焊接学报, 2023, 44(1): 33-39. DOI: 10.12073/j.hjxb.20220106003
引用本文: 张楠, 张海武, 王淼辉, 杜兵, 张平, 张志豪. 微米级选区激光熔化316L不锈钢拉伸变形中Σ3n特殊晶界的分布[J]. 焊接学报, 2023, 44(1): 33-39. DOI: 10.12073/j.hjxb.20220106003
ZHANG Nan, ZHANG Haiwu, WANG Miaohui, DU Bing, ZHANG Ping, ZHANG Zhihao. Study on special grain boundary distribution of Σ3n in micron selective laser melting of 316L stainless steel during tensile deformation[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(1): 33-39. DOI: 10.12073/j.hjxb.20220106003
Citation: ZHANG Nan, ZHANG Haiwu, WANG Miaohui, DU Bing, ZHANG Ping, ZHANG Zhihao. Study on special grain boundary distribution of Σ3n in micron selective laser melting of 316L stainless steel during tensile deformation[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(1): 33-39. DOI: 10.12073/j.hjxb.20220106003

微米级选区激光熔化316L不锈钢拉伸变形中Σ3n特殊晶界的分布

基金项目: 国家自然科学基金资助(项目号51975240);北京市自然科学基金资助(项目号2222093)
详细信息
    作者简介:

    张楠,博士,高级工程师;主要从事金属材料连接及其界面行为的科研工作;Email: giftzn@163.com

    通讯作者:

    王淼辉,博士,研究员;Email: wangmh0103@163.com.

  • 中图分类号: TG 456.7

Study on special grain boundary distribution of Σ3n in micron selective laser melting of 316L stainless steel during tensile deformation

  • 摘要: 利用电子背散射衍射(EBSD)技术研究了微米级选区激光熔化制备316L不锈钢横向拉伸试样和法向拉伸试样在8%、18%和28%拉伸应变下的晶界特征分布. 结果表明,随着拉伸应变的增加,横向试样和法向试样的Σ3晶界比例显著增加,Σ9 + Σ27晶界比例明显降低. Σ3晶界有效隔断了一般大角度晶界的贯通性. 通过微矩形截面法对Σ3特殊晶界的共格/非共格特征进行测定,其中,横向试样在18%拉伸应变下以Σ3IC为主,约占60%,而法向拉伸试样在同样条件下以Σ3C为主,约占73%. 进一步分析指出,非共格Σ3IC晶界的迁移并与Σ9晶界的汇合是促进拉伸应变过程中Σ3特殊晶界比例升高的原因.
    Abstract: In this paper, electron back scatter diffraction (EBSD) technique was used to study the grain boundary characteristic distribution of 316L stainless steel transverse tensile samples and normal tensile samples prepared by micron selective laser melting under 8%, 18% and 28% tensile strain. The results show that with the increase of tensile strain, the proportion of Σ3 grain boundaries of transverse and normal samples increased significantly, while the proportion of Σ9 and Σ27 grain boundaries decreased significantly. The connectivity of general high angle grain boundary network was effectively interrupted by Σ3 grain boundaries. The coherent/incoherent characteristics of special grain boundaries were measured by micro rectangular section method. When the transverse specimen was under 18% tensile strain, the special grain boundaries were mainly Σ3IC, accounting for about 60%. Under the same conditions, the special grain boundaries of normal tensile specimen were mostly Σ3C, accounting for about 73%. Further analysis pointed out that the migration of incoherent Σ3IC grain boundaries and the interaction with Σ9 grain boundaries were the reasons for the increase of the proportion of Σ3 special grain boundaries during the tensile strain.
  • 图  1   M-SLM制备拉伸试样尺寸示意图

    Figure  1.   Schematic of tensile sample using M-SLM

    图  2   特殊晶界比例分布

    Figure  2.   Proportional distribution of special grain boundaries

    图  3   试样1在不同应变下的变形分布图

    Figure  3.   Deformation distribution of sample 1 under different strains. (a) tensile strain 8%; (b) tensile strain 18%; (c) tensile strain 28%

    图  4   试样2在不同应变下的变形分布图

    Figure  4.   Deformation distribution of sample 2 under different strains. (a) tensile strain 8%; (b) tensile strain 18%; (c) tensile strain 28%

    图  5   M-SLM制备316L拉伸试样应变量对特殊晶界的影响

    Figure  5.   Effect of strain on special grain boundaries of 316L tensile specimens prepared by M-SLM. (a) Σ3n proportional distribution in sample 1; (b) Σ3n proportional distribution in sample 2

    图  6   试样1的拉伸区域取向显微重构晶界分布图

    Figure  6.   Grain boundary distribution of microstructure reconstruction in tensile region of sample 1. (a) tensile strain 8%; (b) tensile strain 18%; (c) tensile strain 28%

    图  7   试样2的拉伸区域取向显微重构晶界分布图

    Figure  7.   Grain boundary distribution of microstructure reconstruction in tensile region of sample 2. (a) tensile strain 8%; (b) tensile strain 18%; (c) tensile strain 28%

    图  8   微矩形截面法判定图6b中指定区域Σ3晶界示意图

    Figure  8.   Schematic diagram of Σ3 grain boundary determination on the designated area in Figure 6b using micro rectangular section method

    图  9   M-SLM和SLM成形316L拉伸力学性能比较[19-23]

    Figure  9.   Comparisons of tensile properties of M-SLM 316L stainless steel and fabricated by SLM

    表  1   316L不锈钢粉末的化学成分(质量分数, %)

    Table  1   Chemical composition of 316L stainless steel powder

    CSiMnSPCrNiNOFe
    0.020.221.58<0.006<0.00818.0213.820.078<0.015余量
    下载: 导出CSV

    表  2   图6b中Σ3晶界分析结果

    Table  2   Σ3 grain boundary analysis results in Fig 6b

    编号角度公差θ(°)晶界特征 编号角度公差θ(°)晶界特征
    6b-1 + 2C 6b-16 − 7IC
    6b-2 − 5IC6b-17 + 8IC
    6b-3 + 5IC6b-18 − 5IC
    6b-4 + 9IC6b-19 + 1C
    6b-5 + 1C6b-20 + 1C
    6b-6 − 2C6b-21 + 5IC
    6b-7 + 5IC6b-22 − 4IC
    6b-8 − 6IC6b-23 + 7IC
    6b-9 + 4IC6b-24 − 6IC
    6b-10 − 2C6b-25 − 4IC
    6b-110C6b-26 + 3C
    6b-12 + 2C6b-27 + 1C
    6b-13 − 8IC6b-28 − 4IC
    6b-14 + 5IC6b-290C
    6b-15 − 3C6b-30 − 5IC
    下载: 导出CSV

    表  3   图7b中Σ3晶界分析结果

    Table  3   Σ3 grain boundary analysis results in Fig 7b

    编号角度公差θ(°)晶界特征 编号角度公差θ(°)晶界特征
    7b-1 + 2C 7b-160C
    7b-2 − 3C7b-17 + 3C
    7b-3 + 1C7b-18 − 2C
    7b-4 − 5IC7b-19 + 4IC
    7b-5 + 3C7b-20 + 4C
    7b-6 − 2C7b-21 − 6IC
    7b-7 + 5IC7b-22 + 1C
    7b-8 − 3C7b-23 + 2C
    7b-9 + 1C7b-24 − 2C
    7b-10 + 7IC7b-25 − 3C
    7b-11 − 1C7b-26 + 1C
    7b-120C7b-27 + 5IC
    7b-13 + 2C7b-28 − 5IC
    7b-14 + 5IC7b-290C
    7b-15 − 3C7b-30 − 1C
    下载: 导出CSV
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  • 期刊类型引用(1)

    1. 王文安. 铝合金焊接头的软化及改善措施分析. 中国设备工程. 2021(12): 73-74 . 百度学术

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  • 收稿日期:  2022-01-05
  • 网络出版日期:  2022-12-14
  • 刊出日期:  2023-01-24

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