孔径对第三代镍基单晶高温合金DD33板式试样室温拉伸性能的影响*

doi:10.11901/1005.3093.2015.131

材料研究学报

2016, Vol. 30

Issue (5): 343-347 DOI: 10.11901/1005.3093.2015.131

本期目录 | 过刊浏览

孔径对第三代镍基单晶高温合金DD33板式试样室温拉伸性能的影响*

周忠娇, 刘涛, 张功, 王莉(

), 楼琅洪

中国科学院金属研究所沈阳 110016

Effect of Hole Diameter on Tensile Behavior of a Ni-base Single Crystal Superalloy DD33

ZHOU Zhongjiao, LIU Tao, ZHANG Gong, WANG Li^**(

), LOU Langhong

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

周忠娇, 刘涛, 张功, 王莉, 楼琅洪. 孔径对第三代镍基单晶高温合金DD33板式试样室温拉伸性能的影响*[J]. 材料研究学报, 2016, 30(5): 343-347.
Zhongjiao ZHOU, Tao LIU, Gong ZHANG, Li WANG, Langhong LOU. Effect of Hole Diameter on Tensile Behavior of a Ni-base Single Crystal Superalloy DD33[J]. Chinese Journal of Materials Research, 2016, 30(5): 343-347.

全文: PDF(778 KB) HTML

摘要:

本文研究了孔径(Φ=0.5、0.7及0.9 mm)对第三代镍基单晶高温合金DD33板式试样室温拉伸性能的影响。采用ARAMIS-光学动态应变测量系统原位观测了拉伸过程中不同孔径孔周围的应变分布, 并利用扫描电镜观察了拉伸试样的断口形貌。结果表明: 随着孔径的增大, 试样的屈服强度和抗拉强度均降低。拉伸过程中孔周围产生应变集中, 而且只在孔边很小的范围。弹性变形阶段, 孔边应变增长缓慢; 一旦发生塑性变形, 应变快速增长。孔径越大, 孔周围的应变集中越严重, 应变梯度越大。上述研究结果对理解含冷却孔单晶叶片的变形行为, 优化叶片结构, 从而提高叶片寿命具有重要意义。

关键词 ：金属材料, 材料的组织结构, 缺陷与性能, 室温拉伸, ARAMIS系统, 镍基单晶高温合金, 孔径, 应变

Abstract：

Plate tensile specimens were machined from a Ni-base single crystal (SC) superalloy DD33, holes with various diameters were electrochemically machined (ECM) in the middle of the specimens. The strain fields around the holes during room temperature tensile tests were in-situ observed by an ARAMIS - optical deformation analysis system based on the digital image correlation (DIC) technique and the fracture surface was observed by scanning electron microscope (SEM). It was demonstrated that the yield strength and ultimate tensile strength decreased with the increase of hole diameter from 0.5 mm to 0.9 mm. Strain concentrated in the vicinity of the hole. The maximum strain increased slightly during elastic deformation. However, once plastic deformation began, it increased rapidly above its elastic value. In addition, the maximum strain and strain gradients adjacent to the holes increased with the increase of the hole diameter from 0.5 mm to 0.9 mm. This work is critical for understanding the crack initiation around the cooling holes with different diameters in the SC blade.

Key words： metallic materials microstructure defects and properties for materials tensile behavior ARAMIS systems Ni-base single crystal superalloy hole diameter strain distribution

收稿日期: 2015-03-17

ZTFLH:

TG115.5+2

基金资助:* 国家自然科学基金51201164和国家高技术研究发展计划项目2012AA03A511资助

作者简介: 本文联系人: 王莉

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.131 或 https://www.cjmr.org/CN/Y2016/V30/I5/343

图1 拉伸样品示意图及用于ARAMIS观察的黑白斑点

图2 不同孔径样品的应力-应变曲线以及屈服强度和抗拉强度的比较

图3 拉伸过程中不同孔径孔周围的应变分布

图4 σ=UTS时距孔边不同距离处的应变分布

图5 拉伸过程中在平行于拉伸方向的孔边x=R处的应变分布

图6 含不同孔径样品的断口形貌

图7 孔边应力分析[13]

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