<strong>GH3535</strong>合金中晶界特征对碲致脆性开裂影响的分形分析

doi:10.11900/0412.1961.2021.00584

金属学报

2023, Vol. 59

Issue (2): 248-256 DOI: 10.11900/0412.1961.2021.00584

研究论文

本期目录 | 过刊浏览

GH3535合金中晶界特征对碲致脆性开裂影响的分形分析

杨杜¹, 白琴¹(

), 胡悦¹, 张勇¹, 李志军², 蒋力², 夏爽¹, 周邦新¹

1.上海大学材料研究所上海 200072
2.中国科学院上海应用物理研究所上海 201800

Fractal Analysis of the Effect of Grain Boundary Character on Te-Induced Brittle Cracking in GH3535 Alloy

YANG Du¹, BAI Qin¹(

), HU Yue¹, ZHANG Yong¹, LI Zhijun², JIANG Li², XIA Shuang¹, ZHOU Bangxin¹

1.Institute of Materials, Shanghai University, Shanghai 200072, China
2.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

引用本文:

杨杜, 白琴, 胡悦, 张勇, 李志军, 蒋力, 夏爽, 周邦新. GH3535合金中晶界特征对碲致脆性开裂影响的分形分析[J]. 金属学报, 2023, 59(2): 248-256.
Du YANG, Qin BAI, Yue HU, Yong ZHANG, Zhijun LI, Li JIANG, Shuang XIA, Bangxin ZHOU. Fractal Analysis of the Effect of Grain Boundary Character on Te-Induced Brittle Cracking in GH3535 Alloy[J]. Acta Metall Sin, 2023, 59(2): 248-256.

全文: PDF(3043 KB) HTML

摘要:

对GH3535合金进行晶界工程(GBE)处理，将得到的GBE样品与未经GBE处理(Non-GBE)样品在700℃下渗碲500 h，再进行原位三点弯曲实验，比较渗碲后GBE和Non-GBE样品的开裂性能，并对三点弯曲实验前局部区域的不同类型晶界取向成像显微图和三点弯曲实验后原位裂纹的形貌图进行分形分析。随机晶界(RGB)与裂纹的分形维数变化趋势相同，随机晶界的分形维数越小，材料抗开裂性能越好。GBE样品中因大尺寸孪晶晶粒团簇的平均尺寸更大，且分布更加均匀，有利于提高材料的抗开裂性能。

关键词 ： GH3535合金, 晶界工程, 三点弯曲, 裂纹, 分形维数

Abstract：

GH3535 alloy has been used as the main structural material of molten salt reactor, which exhibits good high-temperature strength and excellent corrosion resistance to the molten salts. The intergranular cracking of GH3535 was detected after four years of operation of the molten salt reactor experiment, which was attributed to the inward diffusion of fission products Te. Grain boundary engineering (GBE) has been successfully applied to enhance the grain-boundary-related properties of the materials by increasing the frequency of low Σ coincidence site lattice grain boundaries and tailoring the grain boundary network. The in situ three-point bending test was used to assess the cracking properties of Non-GBE and GBE samples following Te infiltration at 700^oC for 500 h. Fractal analysis statistics of various types of grain boundaries and cracks following in situ three-point bending tests were used. The result shows that the fractal dimension of cracks is in accord with that of the random grain boundaries (RGBs). The stronger the fracture resistance of materials, the lower the value of the RGB fractal dimension. The GH3535 alloy GBE samples with a bigger average size and more uniformly distributed twin grain clusters will have greater cracking resistance.

Key words： GH3535 alloy grain boundary engineering three-point bending crack fractal dimension

收稿日期: 2021-12-27

ZTFLH:

TG174.1

基金资助:国家重点研发计划项目(2018YFE0122100);国家自然科学基金项目(51871144)

作者简介: 杨杜，男，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00584 或 https://www.ams.org.cn/CN/Y2023/V59/I2/248

图1 计盒维数法计算晶界分形维数的示意图

图2 未经晶界工程处理(NS)和经晶界工程处理(GS)样品不同类型晶界的OIM图

表1 NS和GS样品的晶界特征分布统计

图3 NS样品观察区域内不同类型晶界的OIM图和对应区域裂纹的SEM像

图4 GS样品观察区域内不同类型晶界的OIM图和对应区域裂纹的SEM像

图5 NS和GS样品观察区域的晶界特征分布直方图

图6 NS和GS样品观察区域内不同类型晶界和裂纹的分形维数直方图

图7 NS样品不同类型晶界的OIM图和对应区域的SEM像

图8 GS样品不同类型晶界的OIM图和对应区域的SEM像

图9 NS和GS样品的晶粒面积分布图

图10 NS和GS样品的GC和NGC观察区域的分形维数直方图

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