王莉 周忠娇 卢玉章 李凯文 张少华 降向冬 楼琅洪 张健. 镍基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, DOI: 10.11900/0412.1961.2014.00366.

摘要 相关文章 Metrics 全文: PDF(981 KB)   摘要: 选用某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 um。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-base 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 were 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 were 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 were investigated and the reasons were analyzed. It was found that a thin recast layer were produced around holes of EDM drilled. The thickness of the recast layer was 15 um 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-base single crystal superalloy    crystal orientation    thermal fatigue    hole    crack initiation and propagation 收稿日期: 2015-07-09      基金资助:国家自然科学基金;国家高科技研究发展计划（863） 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 王莉 周忠娇 卢玉章 李凯文 张少华 降向冬 楼琅洪 张健 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 谭若涵, 宋永锋, 陈超, 李丹, 成庶, 李雄兵. 增材制造钛合金等效弹性张量的细观力学建模与实验研究[J]. 金属学报, 2025, 61(9): 1438-1448. [2] 李永梅, 谭子昊, 王新广, 陶稀鹏, 杨彦红, 刘纪德, 刘金来, 李金国, 周亦胄, 孙晓峰. 一种低成本第三代单晶高温合金的高温氧化行为[J]. 金属学报, 2025, 61(7): 1049-1059. [3] 何家宝, 王亮, 张朝威, 邹明科, 孟杰, 王新广, 姜肃猛, 周亦胄, 孙晓峰. Al2O3 涂层对硅基陶瓷型芯与镍基单晶高温合金界面反应的影响[J]. 金属学报, 2025, 61(7): 1093-1108. [4] 杨晓宇, 米振莉, 方幸, 刘航瑞, 牟望重. 马氏体-奥氏体组元特征分布对复相钢扩孔行为的影响[J]. 金属学报, 2025, 61(5): 674-686. [5] 蔡宣明, 张伟, 范志强, 高玉波, 王俊元, 张柱军. AlSi10Mg多孔结构在不同加载应变率下的损伤模式及响应机制[J]. 金属学报, 2024, 60(7): 857-868. [6] 李振杰, 蔡桂喜, 张博, 李经明, 李建奎. 金属圆棒超声螺旋扫查检测的合成孔径成像技术[J]. 金属学报, 2024, 60(4): 559-568. [7] 蒋招汉, 邱文婷, 龚深, 李周. 轻质高强高阻尼HfO2@CNT/聚合物/CuAlMn复合材料的制备及性能[J]. 金属学报, 2024, 60(3): 287-298. [8] 刘静, 张思倩, 王栋, 王莉, 陈立佳. Ta对一种抗热腐蚀镍基单晶高温合金长时热暴露组织和蠕变性能的影响[J]. 金属学报, 2024, 60(2): 179-188. [9] 郭松源, 柳文波, 杨庆成, 戚晓勇, 恽迪. 黏性烧结过程的相场模拟[J]. 金属学报, 2024, 60(12): 1691-1700. [10] 张振武, 李继康, 许文贺, 沈沐宇, 戚磊一, 郑可盈, 李伟, 魏青松. 搭接工艺对选区激光熔化镍基单晶高温合金DD491晶体取向与微观组织的影响[J]. 金属学报, 2024, 60(11): 1471-1486. [11] 刘悦, 姚文轩, 刘大晖, 丁琳, 杨正伟, 刘微, 于涛, 施思齐. 高质量文本数据驱动的命名实体识别加速镍基单晶高温合金材料知识发现[J]. 金属学报, 2024, 60(10): 1429-1438. [12] 侯志远, 刘威峰, 徐斌, 孙明月, 时婧, 任少飞. M50轴承钢热变形过程中孔洞形成及演化机制[J]. 金属学报, 2024, 60(1): 57-68. [13] 赵鹏, 谢光, 段慧超, 张健, 杜奎. 两种高代次镍基单晶高温合金热机械疲劳中的再结晶行为[J]. 金属学报, 2023, 59(9): 1221-1229. [14] 赵亚峰, 刘苏杰, 陈云, 马会, 马广财, 郭翼. 铁素体-贝氏体双相钢韧性断裂过程中的夹杂物临界尺寸及孔洞生长[J]. 金属学报, 2023, 59(5): 611-622. [15] 张东阳, 张钧, 李述军, 任德春, 马英杰, 杨锐. 热处理对选区激光熔化Ti55531合金多孔材料力学性能的影响[J]. 金属学报, 2023, 59(5): 647-656. Viewed Full text Abstract Cited   Shared      Discussed