Please wait a minute...
 
材料工程  2007, Vol. 0 Issue (12): 15-20    
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
镍基单晶合金紧凑拉伸试样高温断裂特性的实验研究
温志勋, 岳珠峰, 朱振涛
西北工业大学, 工程力学系, 西安710072
Fracture Behaviour of Compact Tension Specimens of Nickel-based Single Crystal Under Tension Creep and Cyclic Loading
WEN Zhi-xun, YUE Zhu-feng, ZHU Zhen-tao
Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an 710072, China
全文: PDF(1067 KB)   HTML()
输出: BibTeX | EndNote (RIS)      
摘要 采用紧凑拉伸(CT)试样对三种晶体取向[001],[011],[111]的镍基单晶合金DD3在950,850℃和760℃下的拉伸以及950℃时的蠕变和疲劳性能进行了实验研究。应用光学显微镜(OM)和扫描电子显微镜(SEM)分别对单晶体裂纹扩展路径和断口表面进行了观察和分析。拉伸实验结果表明:单晶体裂纹扩展路径沿着特定的晶体学矢量方向扩展而在试样自由表明呈现Z字型外观,其扩展方向及形状取决于晶体取向。温度对试样的断裂形式影响较为显著,760℃时的断裂特征为剪切型脆性断裂,断裂平面为沿滑移面的光滑斜断口;950℃下试样断裂逐渐转变为微孔聚集型韧性断裂,断口由粗糙的剪切唇和纤维区构成。蠕变和疲劳实验结果表明:镍基单晶具有明显的蠕变和疲劳性能各向异性,蠕变寿命以[011],[111],[001]顺序依次减小,疲劳寿命以[111],[011],[001]顺序依次减小;蠕变及疲劳裂纹扩展路径均与加载方向垂直,断裂表面均为光滑的平断口。试样断口细观分析显示,蠕变试样断口由杯锥状韧窝组成,而疲劳试样断口则由疲劳裂纹组成。疲劳损伤比蠕变损伤更有利于裂纹的扩展。
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
温志勋
岳珠峰
朱振涛
关键词 单晶体CT试样裂纹扩展路径    
Abstract:The fracture behaviour of compact tension(CT) specimens of nickel-based single crystal superalloys DD3 was studied at 950,850,760℃.The creep and fatigue property was investigated at 950℃.Three crystallographic orientations , and of the specimens were considered.The macro crack growth and micro characterization of the fracture surfaces were examined by the optical microscope(OM) and scan electron microscope(SEM).The tension experimental results show that the macro crack growth path takes place in specific vectors and appears to be in a zigzag manner.The temperature has much influence on fracture behaviour.At low temperature(760℃),the fracture mode is pure shear fracture and belongs to brittle mode.But at high temperature(950℃),fracture mode turns to be microvoid coalescence fracture and belongs to ductile mode.The creep and fatigue properties of CT specimens are obviously anisotropic.Creep life decreases in the order of ,, and fatigue life decreases in the order of ,, under same test conditions.The creep and fatigue crack growth path is perpendicular to the loading axis.It is found by SEM that there are much cup-cone dimple on the creep fracture and typical fatigue striations on the fatigue fracture surface.The fracture damage can results in crack growth more easily than creep damage.
Key wordssingle crystal    CT specimen    crack growth path
收稿日期: 2007-03-30      出版日期: 2007-12-20
中图分类号:  TG111.91  
基金资助:国家自然科学基金(10472094,50375124);国家航空基金(03B53003,02C53011);西北工业大学研究生创业种子基金(Z200620)
作者简介: 温志勋(1982- ),男,博士生,主要从事镍基单晶材料力学性能研究,联系地址:西北工业大学410信箱(710072).
引用本文:   
温志勋, 岳珠峰, 朱振涛. 镍基单晶合金紧凑拉伸试样高温断裂特性的实验研究[J]. 材料工程, 2007, 0(12): 15-20.
WEN Zhi-xun, YUE Zhu-feng, ZHU Zhen-tao. Fracture Behaviour of Compact Tension Specimens of Nickel-based Single Crystal Under Tension Creep and Cyclic Loading. Journal of Materials Engineering, 2007, 0(12): 15-20.
链接本文:  
http://jme.biam.ac.cn/CN/      或      http://jme.biam.ac.cn/CN/Y2007/V0/I12/15
[1] 尹泽勇,岳珠峰,杨治国,等.各向异性单晶合金结构强度与寿命[M].北京:国防工业出版社,2002.12.
[2] 何玉怀,苏彬.中国航空发动机涡轮叶片用材料力学性能状况分析[J].航空发动机,2005,3(12):51-54.
[3] 张卫方,李运菊,赵爱国,等.定向凝固合金叶片裂纹与断裂综合分析[J].航空材料学报,2003,23(增刊):127-131.
[4] YUE Z F,LU Z Z,ZHENG C Q.Fracture behavior of a nickel-base single crystal superalloy as predicted by the strain energy density criterion[J].Theoretical and Applied Fracture Mechanics,1997,26:89-104.
[5] RICE J R.Tensile crack tip fields in elastic-ideally plastic crystals[J].Mechanics of Materials,1987,6(11):317-335.
[6] FLOURIOT S,FOREST S,CAILLETAUD G,et al.Strain localization at the crack tip in single crystal CT specimens under monotonous loading:3D finite element analyses and application to nickel-base superalloys[J].International Journal of Fracture,2003,124(12):43-77.
[7] MARCHAL N,FLOURIOT S,FOREST S,et al.Crack-tip stress-strain fields in single crystal nickel-base superalloys at high temperature under cyclic loadings[J].Computational Materials Science,2006,37(13):42-50.
[8] 单智伟,杨继红,刘路.单晶Ni3Al裂纹扩展的TEM原位观察[J].金属学报,2000,36(3):262-267.
[9] 刘丽荣,金涛,赵乃仁,等.一种Ni基单晶高温合金[001] 方向的持久性能与断裂行为[J].金属学报,2000,36(3):262-267.
[10] 王开国,李嘉荣,刘世忠,等.DD6单晶高温合金760℃的蠕变性能研究[J].材料工程,2004,(5):7-11.
[1] 汝继来, 吴仲棠, 王仁智, 殷源发, 杨素玲. DD3单晶材料形变组织的再结晶动力学研究 [J]. 材料工程, 1996, 0(12): 13-15.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
版权所有 © 2015《材料工程》编辑部
地址:北京81信箱44分箱 邮政编码: 100095
电话:010-62496276 E-mail:matereng@biam.ac.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn