基于缺陷三维成像的电子束熔丝增材制造钛合金疲劳寿命模型
Fatigue Life Model of Electron Beam Fusion Additive ManufacturedTitanium Alloy Using 3D Defect Tomography
摘 要
应用高分辨率同步辐射三维X射线成像技术获取电子束熔丝增材制造Ti-6Al-4V合金的特征参数，结合高周疲劳试验分析缺陷对合金疲劳性能的影响；考虑缺陷特征参数对已有Z参数疲劳寿命模型进行修正，提出了X参数疲劳寿命模型。结果表明：所制造Ti-6Al-4V合金存在气孔及未熔合缺陷；不同应力水平下合金的疲劳寿命均存在较大的离散性，50%存活率下合金的疲劳极限为679 MPa，多数疲劳裂纹萌生于气孔、未熔合缺陷处；由X参数疲劳寿命模型得到的X参数-疲劳寿命曲线的线性拟合相关系数为0.878 5，比由Z参数疲劳寿命模型得到的提高了近20%，疲劳寿命离散性显著降低，模型的预测精度显著提高。
三维X射线成像
缺陷
疲劳寿命模型
electron beam fusion additive manufacturing
3D X-ray tomography
defect
fatigue life model
Abstract
The charcteristic parameters of defects in electron beam fusion additive manufactured Ti-6Al-4V alloy were obtained by high-resolution synchrotron radiation 3D X-ray tomography technique. Combining with high cycle fatigue tests, the influence of defects on fatigue properties of the alloy was analyzed. The Z-parameter fatigue life model was modified by considering defect characteristic parameters, and an X-parameter fatigue life model was proposed. The results show that there were porosity and incomplete fusion defects in the manufactured Ti-6Al-4V alloy. The fatigue life of the alloy had significant dispersion in different stress levels and the fatigue limit with 50% survival rate was 679 MPa. Most of the fatigue cracks originated at the porosity and incomplete fusion defects. The linear fitting correlation coefficient of X-parameter-fatigue life curve by X-parameter fatigue life model was 0.878 5, and was improved by nearly 20% compared with the Z-parameter fatigue life model, the dispersion of fatigue life significantly decreased, and the prediction accuracy of the model was significantly improved.
中图分类号 TG146.2 DOI 10.11973/jxgccl202104014
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金大科学装置联合基金培育项目（U2032121）；国家重点研发计划项目（2016YFB1100400）；装备预研航空科学基金项目（6141B051506）；国防基础科研计划项目（JCKY2018205B027）
收稿日期 2021/1/20
修改稿日期 2021/3/11
网络出版日期
作者单位点击查看
备注方燕玲(1981-),女,四川成都人,工程师,硕士
引用该论文: FANG Yanling,XIE Cheng,WU Shengchuan,ZHANG Jie,YANG Guang,QI Shiwen,LI Fei. Fatigue Life Model of Electron Beam Fusion Additive ManufacturedTitanium Alloy Using 3D Defect Tomography[J]. Materials for mechancial engineering, 2021, 45(4): 72～80
方燕玲,谢成,吴圣川,张杰,杨光,齐世文,李飞. 基于缺陷三维成像的电子束熔丝增材制造钛合金疲劳寿命模型[J]. 机械工程材料, 2021, 45(4): 72～80
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参考文献
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【3】ZUO J, WANG Z G, HAN E, et al. Effect of microstructure on ultra-high cycle fatigue behavior of Ti-6Al-4V[J]. Materials Science and Engineering:A, 2008, 473(1):147-152.
【4】吴正凯,吴圣川,张杰,等.基于同步辐射X射线成像的选区激光熔化Ti-6Al-4V合金缺陷致疲劳行为[J].金属学报,2019,55(7):811-820. WU Z K, WU S C, ZHANG J, et al. Defect induced fatigue behaviors of selective laser melted Ti-6Al-4V via synchrotron radiation X-ray tomography[J]. Acta Metallurgica Sinica, 2019, 55(7):811-820.
【5】NING F D, CONG W L, QIU J J, et al. Additive manufacturing of carbon fiber reinforced thermoplastic composites using fused deposition modeling[J]. Composites Part B:Engineering, 2015, 80:369-378.
【6】BIAMINO S, PENNA A, ACKELID U,et al.Electron beam melting of Ti-48Al-2Cr-2Nb alloy:Microstructure and mechanical properties investigation[J].Intermetallics,2011,19(6):776-781.
【7】ARRIETA E, HAQUE M S, MIRELES J, et al. Mechanical behavior of differently oriented electron beam melting Ti-6Al-4V components using digital image correlation[J]. Journal of Engineering Materials and Technology, 2019, 141(1):011004.
【8】SONG B, DONG S J, CODDET P, et al.Fabrication of NiCr alloy parts by selective laser melting:Columnar microstructure and anisotropic mechanical behavior[J].Materials and Design, 2014, 53:1-7.
【9】赵剑峰,马智勇,谢德巧,等.金属增材制造技术[J].南京航空航天大学学报,2014,46(5):675-683. ZHAO J F, MA Z Y, XIE D Q, et al. Metal additive manufacturing technique[J]. Journal of Nanjing University of Aeronautics & Astronautics, 2014, 46(5):675-683.
【10】MURAKAMI Y. Material defects as the basis of fatigue design[J]. International Journal of Fatigue, 2012, 41:2-10.
【11】MURAKAMI Y. Metal fatigue:Effects of small defects and nonmetallic inclusions[M]. Oxford:Elsevier, 2002.
【12】TAMMAS-WILLIAMS S, WITHERS P J, TODD I, et al.The influence of porosity on fatigue crack initiation in additively manufactured titanium components[J].Scientific Reports,2017,7(1):7308.
【13】张帅锋,蒋鹏,于冰冰,等.电子束熔丝成形Ti-6Al-3Nb-2Zr-Mo合金的组织与力学性能[J].焊接学报,2019,40(10):121-126. ZHANG S F, JIANG P, YU B B, et al. Microstructure and mechanical properties of electron beam rapid maunfacturing Ti-6Al-3Nb-2Zr-Mo alloy[J]. Transactions of the China Welding Institution, 2019, 40(10):121-126.
【14】CHEN L, HU Y N, HE E G, et al. Microstructural and failure mechanism of laser welded 2A97 Al-Li alloys via synchrotron 3D tomography[J]. International Journal of Lightweight Materials and Manufacture, 2018, 1(3):169-178.
【15】GONG H, RAFI K, GU H, et al. Influence of defects on mechanical properties of Ti-6Al-4V components produced by selective laser melting and electron beam melting[J]. Materials and Design, 2015, 86:545-554.
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【20】宋哲,吴圣川,胡雅楠,等. 冶金型气孔对熔化焊接7020铝合金疲劳行为的影响[J]. 金属学报,2018,54(8):1131-1140. SONG Z,WU S C,HU Y N,et al. The influence of metallurgical pores on fatigue behaviors of fusion welded AA7020 joints[J]. Acta Metallurgica Sinica, 2018, 54(8):1131-1140.
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