摘要
研究了应变速率对GH4169合金激光焊接接头拉伸性能及变形行为的影响规律及机制。结果表明,与母材相比,GH4169合金激光焊接接头的变形行为对应变速率更为敏感。随应变速率的增加,焊接接头的强度有所提高,塑性则呈先下降后升高的趋势,断裂位置由母材经热影响区向熔合区靠近,断口韧窝尺寸先变大后减小,表明接头的变形行为具有较高的应变速率敏感性。
The present work aimed to study the effect of strain rate on the tensile properties of GH4169 super alloy welded joint and the results show that the welded joints are more sensitive to the strain rate compared to the base material,the strength of the welded joints increased with the increasing strain rate,while the ductility decreased first and then increased.The failure location changed from the base material to the softened heat-affected zone and then closed to the fusion zone with the increase of strain rate,and the variation of the dimple size illustrated the sensitivity of the welded joint to the high strain rate.
引文
[1]陈光.航空燃气涡轮发动机结构[M].北京:北京航空航天大学出版社,2010.
[2]Klotz U E,Henderson MB,et al.Manufacture and microstructural characterization of bimetallic gas turbine discs[J].Materials Science and Technology,2005(21):218~224.
[3]徐家文,赵建设.航空发动机整体构件特种加工新技术[M].北京:国防工业出版社,2011.
[4]Vishwakarma K R,Richards N L,et al.Microstructural analysis of fusion and heat affected zones in electron beam welded ALLVAC 718PLUS~(TM)superalloy[J].Materials Science and Engineering A,2008(480):517~528.
[5]Hong J K,Park J H,et al.Microstructures and mechanical properties of Incnel 718 welds by CO_2 laser welding[J].Journal of Materials Processing Technology,2008(201);515~520.
[6]Huang B W.Effect of number of blades and distribution of cracks on vibration localization in a cracked pre-twisted blade system[J].International Journal of Mechanical Sciences,2006(48):1~10.
[7]Fang X,Tang J,et al.Crack induced vibration localization in simplified bladed-disk structures[J].Journal of Sound and Vibration,2006(291):395~418.
[8]陈光.航空发动机结构设计分析[M].2版.北京:北京航空航天大学出版社,2014.
[9]Meyers M A.Dynamic behavior of materials[M].New York:John Wiley and Sons Inc.,2007.
[10]Voyiadjis G Z,Abed F H.A coupled temperature and strain rate dependent yield function for dynamic deformations of bcc metals[J].International Journal of Plasticity,2006(22):1398~1431.
[11]Meyers M A,Nesterenko V F,et al.Shear localization in dynamic deformation of materials:microstructural evolution and self-organization[J].Materials Science and Engineering A,2001(317):204~225.
[12]刘杨,王磊,等.长期时效对GH4169合金动态拉伸变形行为的影响[J].金属学报,2012(48):49~55.
[13]Liu Y,Dong D Y,et al.Strain rate dependent deformation and failure behavior of laser welded DP780 steel joint under dynamic tensile loading[J].Materials Science and Engineering A,2015(627):296~305.
