截面尺寸和固溶制度对单晶高温合金DD33中显微孔洞的影响

doi:10.11901/1005.3093.2017.152

材料研究学报

2018, Vol. 32

Issue (3): 168-176 DOI: 10.11901/1005.3093.2017.152

研究论文

本期目录 | 过刊浏览

截面尺寸和固溶制度对单晶高温合金DD33中显微孔洞的影响

韩东宇^1,², 姜卫国¹(

), 肖久寒¹, 李相伟^1,², 楼琅洪¹

1 中国科学院金属研究所沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016;

Effect of Section Size and Solution Treatment on Micropore of a Third-Generation Single Crystal Superalloy DD33

Dongyu HAN^1,², Weiguo JIANG¹(

), Jiuhan XIAO¹, Xiangwei LI^1,², Langhong LOU¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;

引用本文:

韩东宇, 姜卫国, 肖久寒, 李相伟, 楼琅洪. 截面尺寸和固溶制度对单晶高温合金DD33中显微孔洞的影响[J]. 材料研究学报, 2018, 32(3): 168-176.
Dongyu HAN, Weiguo JIANG, Jiuhan XIAO, Xiangwei LI, Langhong LOU. Effect of Section Size and Solution Treatment on Micropore of a Third-Generation Single Crystal Superalloy DD33[J]. Chinese Journal of Materials Research, 2018, 32(3): 168-176.

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摘要:

研究了截面尺寸和固溶制度对DD33单晶高温合金中显微孔洞的影响。结果表明：随着截面尺寸的增大铸态合金的枝晶间距增大,共晶的含量提高。合金中的铸态微孔存在于共晶附近,其体积分数随着截面尺寸的增大稍有提高。在固溶制度相同的条件下,随着截面尺寸的增大残余共晶的含量和微孔的体积分数增加。当截面尺寸相同时,随着固溶温度的升高微孔体积分数增加。在固溶处理过程中各元素的不平衡扩散产生的Kirkendall效应导致合金内部固溶微孔的产生,不同截面尺寸造成组织偏析程度的不同是截面尺寸影响固溶微孔体积分数的主要原因。根据叶片的组织演化规律,给出了叶片固溶制度的设计方案并进行了实验验证。

关键词 ：金属材料, 单晶高温合金, 截面尺寸, 固溶制度, 显微孔洞

Abstract：

The effect of section size and solution treatment process on micropore of a nickel-based single crystal superalloy DD33 was investigated by optical microscope (OM) and scanning electron microscope (SEM). The results show that the primary dendrite arm spacing and the volume fraction of eutectics increase with the increasing of section size in the as-cast alloys. Solidification micropores occur at locations near the eutectic. The volume fraction of solidification micropores increases slightly with the increasing of section size. After the same solution treatment for alloys, the volume fractions of residual eutectics and micropores increase with the increasing of section size. Under the condition of the same section size, the volume fraction of micropores increases with the increasing of solution temperature. The formation of internal micropores is due to the Kirkendall effect induced by imbalanced diffusion of the elements during solution treatment. The different section sizes of castings lead to the different segregation degrees, which results in the different volume fractions of the homogenization micropores. According to the evolution of microstructure of the blade, the appropriate solution treatment process was designed and then verified experimentally.

Key words： metallic materials single crystal superalloy section size solution treatment micropore

收稿日期: 2017-02-24

ZTFLH:

TG146

基金资助:国家自然科学基金(51674235, 51671196, 51401216和51701220)

作者简介:

作者简介韩东宇,男,1992年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.152 或 https://www.cjmr.org/CN/Y2018/V32/I3/168

图1 不同截面尺寸试样在不同固溶制度下的显微组织

图2 不同截面尺寸试样在不同固溶制度下的共晶体积分数

图3 不同截面尺寸试样在不同固溶制度下的显微孔洞

图4 不同截面尺寸试样在不同固溶制度下显微孔洞的体积分数

图5 5 mm铸态试样中共晶附近的不规则铸态微孔及其形貌和共晶附近的近圆形铸态微孔及其形貌

图6 2.5 mm/1320℃试样中典型固溶微孔的位置和形貌

图7 2.5 mm/1320℃试样中共晶附近的铸态微孔和固溶微孔形貌

图8 不同截面尺寸位置的共晶体积分数与固溶温度的关系

图9 不同截面尺寸位置的微孔体积分数与固溶温度的关系

图10 固溶温度为1335℃时不同截面尺寸试样的显微组织和孔洞

图11 固溶温度为1335℃时不同截面尺寸试样的微孔体积分数

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