哈氏合金薄板激光填丝焊接接头高周疲劳性能
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摘要
为了评价激光薄板填丝焊接接头的高周疲劳性能,利用升降试验法评价了指定2×10~6周次寿命的0.7 mm厚激光填丝焊接接头样件高周疲劳强度,借助扫描电子显微镜分析了断口及断裂位置。结果显示,激光填丝焊接接头的高周疲劳强度为396.6 MPa,断口形貌显示近无夹杂物,裂纹源区呈解理特征,裂纹主要为沿晶扩展,在裂纹扩展区呈现典型的疲劳条纹特征,且条纹间距随裂纹扩展长度的延长而加宽,瞬断区主要呈现与拉伸断口一致的韧窝形貌。观察断口截貌可知,裂纹主要在焊缝上表面焊趾附近萌生,并沿板厚方向扩展,在沿焊接方向扩展过程中会跨越熔合线,在焊缝区内和相邻母材区内扩展。
In order to evaluate the high cycle fatigue performance of laser weld joint with filler wire,the 2 ×10~6 high cycle fatigue strength of 0.7 mm thick laser weld joint with filler wire is evaluated by up and down method. SEM is used to analysis the fracture surface and fracture position. The results showed that the fatigue strength was 396.6 MPa. The fracture surface showed no precipitated phase. The crack source zone showed cleavage features,which mean the crack prolonged along the grain boundaries at early stage. The crack developing zone showed fatigue striations which became sparse with crack prolonging. Fracture zone feature was same with the tensile fracture surface which showed dimples and micro-holes features. The crack was originated from weld toe region on the top surface and prolonged along the thickness direction. During the propagation along the weld direction,the crack spread across the fusion line and in the weld zone and the adjacent base metal zone.
In order to evaluate the high cycle fatigue performance of laser weld joint with filler wire,the 2 ×10~6 high cycle fatigue strength of 0.7 mm thick laser weld joint with filler wire is evaluated by up and down method. SEM is used to analysis the fracture surface and fracture position. The results showed that the fatigue strength was 396.6 MPa. The fracture surface showed no precipitated phase. The crack source zone showed cleavage features,which mean the crack prolonged along the grain boundaries at early stage. The crack developing zone showed fatigue striations which became sparse with crack prolonging. Fracture zone feature was same with the tensile fracture surface which showed dimples and micro-holes features. The crack was originated from weld toe region on the top surface and prolonged along the thickness direction. During the propagation along the weld direction,the crack spread across the fusion line and in the weld zone and the adjacent base metal zone.
引文
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[11]高镇同.疲劳应用统计学[M].北京:国防工业出版社,1986.
[2]Hashim M,Babu K E S R,Duraiselvam M,et al.Improvement of wear resistance of Hastelloy C-276 through laser surface melting[J].Material Design,2013(46):546-551.
[3]关锐,高永军.AP1000反应堆主泵屏蔽套制造工艺浅析[J].中国核电,2008,1(1):49-53.
[4]Miiller F E H,Heilmaier M,Schultz L.The influence of texture and grain structure on the high temperature lowcycle fatigue behavior of the ODS nickel-based superalloy PM 1000[J].Material Science and Engineering,1997(236):509-512.
[5]Ren W J,Nicholas T.Effects and mechanisms of low cycle fatigue and plastic deformation on subsequent high cycle fatigue limit in nickel-base superalloy Udimet 720[J].Material Science and Engineering,2002(332):236-248.
[6]毛雪平,陆道纲,徐鸿,等.应变控制下具有保持时间的镍基合金C276高温低周疲劳实验研究[J].中国电机工程学报,2002,30(17):74-78.
[7]马广义,吴东江,郭玉泉,等.超薄Hastelloy C-276脉冲激光焊接接头的拉伸性能[J].稀有金属材料与工程,2013,42(6):1241-1245.
[8]Chai D S,Wu D D,Ma G Y,et al.The Effects of Pulse Parameters on Weld Geometry and Microstructure of a Pulsed Laser Welding Ni-Base Alloy Thin Sheet with Filler Wire[J].Metals,2016,6(10):1-13.
[9]刘帅,吴冬冬,柴东升,等.Hastelloy C-276薄板激光焊接接头疲劳性能[J].中国有色金属学报,2016,6(10):1-13.
[10]Al-Mukhtar A M,Biermann H,Hubner P,et al.Determination of Some Parameters for Fatigue Life in Welded Joints Using Fracture Mechanics Method[J].Journal of Materials Engineering and Performance,2010,19(9):1125-1134.
[11]高镇同.疲劳应用统计学[M].北京:国防工业出版社,1986.