激光冲击强化对TC17钛合金微观组织及拉伸性能的影响
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摘要
分别采用20、25和30 J脉冲激光冲击TC17钛合金,研究其微观组织演变、表面形貌及粗糙度变化、残余应力分布以及室温拉伸性能。研究结果表明:25 J激光冲击强化后,冲击影响层α相晶粒平均尺寸由激光冲击前的11.17μm减小到6.93μm,晶体内部产生高密度位错、孪晶以及层错缺陷,位错密度由冲击前的8.11×10~(13) m~(-2)增加到3.59×10~(14) m~(-2)。20,25,30 J激光冲击强化,试样表面粗糙度减小(0.922、0.537、0.305μm),表面残余应力增大(–213、–296、–774 MPa)。激光冲击强化后TC17钛合金屈服强度提升30～70 MPa,激光冲击强化诱导晶粒细化对TC17钛合金的抗拉强度影响较小。
A pulse laser with different energies of 20, 25 and 30 J was employed to peen TC17 titanium alloy. Microstructure evolution, surface morphology, roughness, residual stress and room temperature tensile properties were investigated. Results show that the average α grain size decreases from 11.17 μm to 6.93 μm after 25 J LSP. High density dislocations and mechanical twins are observed and the dislocation density increases from 8.11× 10~(13)m~(-2) to 3.59× 10~(14)m~(-2). Surface roughness decreases from 0.922 μm to 0.537 μm and further decreases to 0.305 μm while the surface residual stress increases from~(-2)13 MPa to-296 MPa and further increases to-774 MPa after 20, 25, and 30 J LSP, respectively. After LSP, the yield strength increases by 30～70 MPa, which indicates that the LSP induced grain refinement has a slight effect on the tensile properties of TC17 titanium alloy.
A pulse laser with different energies of 20, 25 and 30 J was employed to peen TC17 titanium alloy. Microstructure evolution, surface morphology, roughness, residual stress and room temperature tensile properties were investigated. Results show that the average α grain size decreases from 11.17 μm to 6.93 μm after 25 J LSP. High density dislocations and mechanical twins are observed and the dislocation density increases from 8.11× 10~(13)m~(-2) to 3.59× 10~(14)m~(-2). Surface roughness decreases from 0.922 μm to 0.537 μm and further decreases to 0.305 μm while the surface residual stress increases from~(-2)13 MPa to-296 MPa and further increases to-774 MPa after 20, 25, and 30 J LSP, respectively. After LSP, the yield strength increases by 30～70 MPa, which indicates that the LSP induced grain refinement has a slight effect on the tensile properties of TC17 titanium alloy.
引文
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[3]Zhu Zhishou(朱知寿).Aeronautical Science&Technology(航空科学技术)[J],2012(1):5
[4]Cai Jianming(蔡建明),Mi Guangbao(弭光宝),Gao Fan(高帆)et al.Journal of Materials Engineering(材料工程)[J],2016,44(8):1
[5]Li Jiukai(李久楷),Liu Yongjie(刘永杰),Wang Qingyuan(王清远)et al.Journal of Aerospace Power(航空动力学报)[J],2014,29(7):1567
[6]Montross C S,Wei T,Ye L et al.International Journal of Fatigue[J],2002,24(10):1021
[7]Liao Y,Ye C,Cheng G J.Optics&Laser Technology[J],2016,78:15
[8]Li Wei(李伟),Li Yinghong(李应红),He Weifeng(何卫锋)et al.Laser&Optoelectronics Progress(激光与光电子学进展)[J],2008,45(12):15
[9]Qiao Hongchao(乔红超),Gao Yu(高宇),Zhao Jibin(赵吉宾)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2015,25(7):1744
[10]Ding K,Ye L.Laser Shock Peening:Performance and Process Simulation[M].Cambridge:Woodhead Publishing Limited,2006
[11]Fairand B P,Wilcox B A,Gallagher W J et al.Journal of Applied Physics[J],1972,43(9):3893
[12]Li Yinghong(李应红).Laser Shock Processing Theory and Technology(激光冲击强化理论与技术)[M].Beijing:Science Press,2013
[13]Braisted W,Brockman R.International Journal of Fatigue[J],1999,21(7):719
[14]Hu Y,Yao Z,Hu J.Surface&Coatings Technology[J],2006,201(3-4):1426
[15]Zhang H,Yu C.Materials Science&Engineering A[J],1998,257(2):322
[16]Qiao Hongchao,Zhao Jibin.Chinese Journal of Aeronautics[J],2015,28(2):609
[17]Cellard C,Retraint D,Fran?ois M et al.Materials Science&Engineering A[J],2012,532(1):362
[18]Qiao H.Applied Surface Science[J],2015,351:524
[19]He Weifeng(何卫锋),Li Yinghong(李应红),Li Qipeng(李启鹏)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(8):107
[20]Nie Xiangfan(聂祥樊),He Weifeng(何卫锋),Wang Xuede(王学德)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2014,43(7):1691
[21]Salem A A,Shaffer J B,Satko D P et al.Integrating Materials and Manufacturing Innovation[J],2014,3(1):24
[22]Smith C S,Guttman L.Trans Aime[J],1953,197(1):81
[23]Ham R K.Philosophical Magazine[J],1961,6(69):1183
[24]Ecob R C.Journal of Microscopy[J],1985,137(1):3
[25]Hu Y X,Yao Z Q,Wang F et al.Surface Engineering[J],2017,23(6):470
[26]Lu J Z,Deng W W,Luo K Y et al.Materials Characterization[J],2017,125:99
[27]Fabbro R,Fournier J,Ballard P et al.Journal of Applied Physics[J],1990,68(2):775
[28]Clauer A H,Lahrman D F.Key Engineering Materials[J],2001,197(1775):121
[29]Hall E O.The Deformation and Ageing of Mild Steel:IICharacteristics of the Lüders Deformation[C].Cambridge:Proceedings of the Physical Society,Section B,1951:64
[30]Petch N J.The Journal of the Iron and Steel Institute[J],1953,173(5):25
[31]Johnson J N,Rohde R W.Journal of Applied Physics[J],1971,42(11):4171
[32]Lu J Z,Luo K Y,Zhang Y K et al.Acta Materialia[J],2010,58(11):3984
[33]Lu J Z,Wu L J,Sun G F et al.Acta Materialia[J],2017,127:252