镍基单晶高温合金冷热循环过程中圆孔周围裂纹萌生与扩展行为

doi:10.11900/0412.1961.2015.00366

金属学报

2015, Vol. 51

Issue (10): 1273-1278 DOI: 10.11900/0412.1961.2015.00366

本期目录 | 过刊浏览

镍基单晶高温合金冷热循环过程中圆孔周围裂纹萌生与扩展行为

王莉¹(

),周忠娇¹,张少华^1sup,降向冬²,楼琅洪¹,张健¹

2 北京北冶功能材料有限公司, 北京 100192

CRACK INITIATION AND PROPAGATION AROUND HOLES OF Ni-BASED SINGLE CRYSTAL SUPERALLOY DURING THERMAL FATIGUE CYCLE

Li WANG¹(

),Zhongjiao ZHOU¹,Shaohua ZHANG¹,Xiangdong JIANG²,Langhong LOU¹,Jian ZHANG¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 Beijing Beiye Functional Materials Corporation, Beijing 100192

引用本文:

王莉,周忠娇,张少华,降向冬,楼琅洪,张健. 镍基单晶高温合金冷热循环过程中圆孔周围裂纹萌生与扩展行为[J]. 金属学报, 2015, 51(10): 1273-1278.
Li WANG, Zhongjiao ZHOU, Shaohua ZHANG, Xiangdong JIANG, Langhong LOU, Jian ZHANG. CRACK INITIATION AND PROPAGATION AROUND HOLES OF Ni-BASED SINGLE CRYSTAL SUPERALLOY DURING THERMAL FATIGUE CYCLE[J]. Acta Metall Sin, 2015, 51(10): 1273-1278.

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摘要:

选用第二代镍基单晶高温合金, 制备了平行于定向凝固方向且分别沿(100)面和(110)面的2组板式试样, 采用电火花方法在试样中心垂直于板面加工孔径为0.5 mm的圆孔. 采用室温到1100 ℃的冷热疲劳实验, 研究了冷热循环过程中不同晶体学平面的板式试样上圆孔周围裂纹萌生及扩展行为. 结果表明, 位于不同晶体学平面的板式试样中, 电火花方法加工圆孔周围产生了一薄层再铸层, 再铸层最厚处约15 mm. 板式试样所在晶体学平面对圆孔周围裂纹萌生及扩展行为影响显著. 冷热循环80 cyc后, (110)面试样中, 裂纹在与枝晶生长方向垂直的孔边产生, 之后迅速沿与枝晶生长方向呈45°角扩展. 而对于(100)面试样, 即使经过200 cyc冷热循环后孔边也未观察到裂纹, 造成此差异的本质原因是单晶高温合金晶体结构的各向异性导致的热应力差别与微观组织特征共同作用的结果.

关键词 ：镍基单晶高温合金, 晶体学取向, 热疲劳, 孔, 裂纹萌生及扩展

Abstract：

Ni-based single crystal (SX) superalloys are widely used for production of blades in gas turbines and aircraft engines for their superior mechanical performance at high temperatures. To obtain high cooling efficiency, most of the SX blades consist of thin wall with cooling holes. However, thermal fatigue cracks are usually observed in blades with this kind of structures. Thus, it must be valuable to investigate the crack initiation and propagation around a hole during thermal fatigue tests in a SX superalloy. In the present work a second generation SX Ni-based superalloy was used. Plate specimens that parallel to directional solidification (DS) direction and along (100) or (110) planes were prepared. A hole with diameter of 0.5 mm was drilled vertical to the surface in the middle of the plate by electro-discharge machining (EDM). Thermal fatigue tests were performed between room temperature and 1100 ℃. Effect of crystal orientation on the crack initiation and propagation was investigated and the reasons were analyzed. It was found that a thin recast layer was produced around holes of EDM drilled. The thickness of the recast layer was 15 mm in the maximum. Crystal orientation has great effect on the crack initiation sites and propagation kinetics. After 80 cyc thermal fatigue tests, in (110) specimens cracks initiated at the edge of the holes that vertical to the DS direction, then grew quickly and propagated along directions about 45°from the DS direction. After 200 cyc tests, cracks developed to more than 2 mm in length. While in (100) specimens no cracks could be observed even after 200 cyc thermal fatigue tests. This difference was mainly due to the combined effects of different thermal stress caused by the anisotropy of single crystals and of the microstructure characteristics.

Key words： Ni-based single crystal superalloy crystal orientation thermal fatigue hole crack initiation and propagation

基金资助:*国家自然科学基金项目51201164, 国家高技术研究发展计划项目2012AA03A511和国家重大科学仪器设备开发专项项目2012YQ22023304资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00366 或 https://www.ams.org.cn/CN/Y2015/V51/I10/1273

图1 含圆孔的不同平面热疲劳镍基单晶高温合金样品示意图

图2 镍基单晶高温合金完全热处理后的OM像和γ’形貌

图3 经电火花打孔后镍基单晶高温合金(100)样品孔周围组织形貌

图4 (100)和(110)样品的圆孔周围裂纹扩展动力学曲线

图5 不同平面样品打孔后以及分别经室温至1100 ℃热疲劳实验不同周次后圆孔周围组织形貌及裂纹扩展形貌

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