采用2mm/min,4.5mm/min和7mm/min的抽拉速率制备了DD6单晶高温合金试棒.研究了抽拉速率对合金650℃低周疲劳性能的影响.利用扫描电镜(SEM)和透射电镜(TEM)分析了疲劳试样的断口形貌和微观组织.研究结果表明:随抽拉速率的增大,γ’相尺寸减小,一次枝晶间距差异不大,二次枝晶呈发达的趋势.抽拉速率4.5 mm/min的合金650℃低周疲劳寿命最长.DD6合金表现为基本稳定的循环应力响应行为.疲劳裂纹主要萌生于试样亚表面,随应变量降低,裂纹扩展第一阶段断裂特征由类解理断裂面向锯齿状断面转变.疲劳裂纹沿一个或者多个｛111｝滑移面扩展.
参考文献
| [1] | 杨富民,孙晓峰,管恒荣,胡壮麒.K40S钻基高温合金的高温低周疲劳行为Ⅰ.疲劳性能[J].金属学报,2002(10):1047-1052. |
| [2] | FLEURY E;REMY L .Low cycle fatigue damage in nickelbase superalloy single crystals at elevated temperature[J].Materials Science and Engineering A,1993,167:23-30. |
| [3] | ANTOLOVICH S D;LIU S;BAUR R .Low cycle fatigue behavior of Rene 80 at elevated temperature[J].Metall trans (A),1981,12:473-481. |
| [4] | SAKAGUCHI M;OKAZAKI M .Effect of microstructure on thermo-mechanical and isothermal low cycle fatigue of a single crystal Ni-base superalloy[J].Key Engineering Materials,2007,253/258:491-494. |
| [5] | PRABIR R Bhowal;DARRYL Stolz;AGNIESZKA M.Surface Effects on Low Cycle Fatigue Behavior in IN718 Alloy[A].,2008:417-423. |
| [6] | CHIERAGATTI R;REMY L.Influence of orientation on the low cycle fatigue of MAR-M200 single crystal at 650℃ Ⅱ:Cyclic stress-strain behaviour[J].Materials Science and Engineering A:Structural Materials:Properties Microstructure and Processing,1991(141):11-22. |
| [7] | LI JR;ZHAO J Q;LIU S Z.Effects of Angle Boundaries on the Mechanical Properties of Single Crystal Superalloy DD6[A].,2008:443-451. |
| [8] | 刘维维;唐定中;李嘉荣 等.抽拉速率对DD6单晶高温合金760℃低周疲劳性能的影响[J].中国有色金属学报,2005,15(02):79-83. |
| [9] | 张卫方,李运菊,高威,姜涛,陶春虎.定向凝固DZ4合金的低周疲劳行为与稳定循环应力[J].航空学报,2004(04):357-361. |
| [10] | 陈立佳;王中光;姚戈 等.铸造Ni基高温合金K417的高温低周疲劳行为[J].金属学报,1999,35(11):1144-1150. |
| [11] | Zhou H.;Harada H.;Ro Y.;Kobayashi T.;Koizumi Y. .Aspects of thermomechanical fatigue of two single crystal nickel based superalloys[J].Materials Science and Technology: MST: A publication of the Institute of Metals,2003(7):847-852. |
| [12] | 胡汉起.金属凝固理论[M].北京:机械工业出版社,2002 |
| [13] | 陶春虎;赵爱国;王理.航空发动机用材料断裂分析及断口图谱[M].北京:国防工业出版社,2007 |
| [14] | GABB T P;GAYDA J;MINER R V .Orientation and temperature dependence of some mechanical properties of the single-crystal nickel-base superalloy rene N4 part Ⅱ:low cycle fatigue behavior[J].Metallurgical Transactions (A),1986,3(17):497-505. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%