激光标刻对GH4169合金疲劳性能的影响  

Effect of Lase Marking Technology on Fatigue Property of GH4169 Alloy

作　　者：回丽 姜云龙 安金岚 周松 曾泓润 HUI Li;JIANG Yun-long;AN Jin-lan;ZHOU Song;ZENG Hong-run(School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China;National Defense Key Discipline Laboratory of Aerospace Manufacturing Process Digitization,Shenyang Aerospace University,Shenyang 110136,China;Chengdu Aircraft Industry(Group)Co.Ltd.,Chengdu 610000,China)

机构地区：[1]沈阳航空航天大学机电工程学院,沈阳110136 [2]沈阳航空航天大学,航空制造工艺数字化国防重点学科实验室,沈阳110136 [3]成都飞机工业(集团)有限责任公司,成都610000

出　　处：《科学技术与工程》2023年第31期13309-13314,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51775355);沈阳航空航天大学航空制造工艺数字化国防重点学科实验室开放基金(SHSYS202104);辽宁省教育厅2021年度科学研究经费项目(LJKZ0194)。

摘　　要：激光标刻是航空制造领域中常用的标刻手段,为进一步加强航空工业中标刻工艺使用的规范性,提高飞机整体和关键零部件的可靠性,采用激光技术对GH4169合金进行标刻处理,研究了激光标刻后GH4169合金的高周疲劳性能和断裂机理。结果表明,激光标刻中值疲劳寿命为37×10^(3)cyc,与未标刻试样相比,激光标刻处理后疲劳寿命下降了83%。激光标刻处理后,标刻处存在激光重熔层改变应力状态,缺口底端呈尖锐状,应力集中程度较高。与未标刻试样单一裂纹源相比,疲劳萌生区由多个裂纹源共同组成,扩展区初期阶段的疲劳条纹间距变大,多源裂纹在疲劳扩展区汇合后出现台阶状和脊状形态,共同作用下导致激光标刻处理后GH4169合金疲劳寿命大幅降低。Laser marking is a commonly used method for marking in the aviation manufacturing industry.In order to further strengthen the normative use of marking technology in the aviation industry and improve the reliability of the aircraft as a whole and key components,the laser technology was used to mark GH4169 alloy,and the high cycle fatigue property and fracture mechanism of GH4169 alloy after laser marking were studied.The results show that the median fatigue life of laser marking is 37×10^(3)cyc,and the fatigue life of laser marking treatment is reduced by 83%compared with that of unmarked samples.After laser marking treatment,there is laser remelting layer at the marking site to change the stress state,and the bottom of the notch is sharp with a high degree of stress concentration.Compared with the single crack source of the unmarked specimen,the fatigue initiation zone is composed of multiple crack sources,the distance between fatigue stripes in the initial stage of the propagation zone is larger,and the multi-source cracks appear step-like and ridge-like shaped after the convergence of the fatigue propagation zone.Under the combined action,the fatigue life of GH4169 alloy after laser marking treatment is greatly reduced.

关 键 词：机械工程 GH4169合金 疲劳寿命 标刻工艺 断裂机理 

分 类 号：TG115[金属学及工艺—物理冶金]