原始孔洞缺陷周围应力分布对镍基单晶高温合金组织演变的影响
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摘要
在高温低应力条件下,研究了DD6镍基单晶合金原始疏松孔洞周围应力分布及其与附近γ′相筏化之间的关系。通过有限元模拟和实验验证发现:原始孔洞形貌和取向对于其界面周围组织稳定性有重要影响,单向加载条件下,疏松孔洞界面主要集中拉应力;孔洞长轴取向越接近于外加载荷方向,其周围γ′发生筏化面积越大。蠕变微裂纹优先由某些形貌取向有利于其周围组织筏化的孔洞界面处产生。
Under high temperature and low stress conditions, the stress distribution around the original porous pores of DD6 nickel based single crystal superalloy and the relationship between the stress distribution and the rafted evolution of γ′ phase were studied. Through finite element simulation and experimental verification, it is found that the morphology and orientation of the original pore have an important effect on the stability of the microstructure around its interface. Under unidirectional loading, the main tensile stress is concentrated on the interface between the porous and matrix. The closer the orientation of the long axis of the pore is to the direction of the applied load, the larger the rafted area of γ′ phase around the pore is. The creep microcracks are preferentially generated at the pore interfaces where some morphologic orientations are favorable to the rafting of the γ′ phase.
Under high temperature and low stress conditions, the stress distribution around the original porous pores of DD6 nickel based single crystal superalloy and the relationship between the stress distribution and the rafted evolution of γ′ phase were studied. Through finite element simulation and experimental verification, it is found that the morphology and orientation of the original pore have an important effect on the stability of the microstructure around its interface. Under unidirectional loading, the main tensile stress is concentrated on the interface between the porous and matrix. The closer the orientation of the long axis of the pore is to the direction of the applied load, the larger the rafted area of γ′ phase around the pore is. The creep microcracks are preferentially generated at the pore interfaces where some morphologic orientations are favorable to the rafting of the γ′ phase.
引文
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[2] 郑玉荣,吴新年,王晓民.镍基高温合金核心技术发展[J].中国材料进展,2015(3):246-252.ZHENG Yu-rong,WU Xin-nian,WANG Xiao-min.Study on the core technology of Ni-based superalloys[J].Materials China,2015(3):246-252.
[3] Tsuno N,Sato A,Tanaka K,et al.Evolution of raft structure during creep deformation of the Ni-based single-crystal superalloy TMS-138[J].Advanced Materials Research,2010,278:19-24.
[4] Tien J K,Copley S M.The effect of orientation and sense of applied uniaxial stress on the morphology of coherent gamma prime precipitates in stress annealed nickel-base superalloy crystals[J].Metallurgical and Materials Transactions,1971,2:543-553.
[5] Nabarro F R N.The chemical driving force for rafting in superalloys[J].Scripta Materialia,1992,40:1-30.
[6] Pollock T M,Argon A S.Creep behavior of Ni-base single-crystal superalloys[J].Acta Metallurgica ET Materialia,1994,42:1859-1867.
[7] Caron P,Khan T.Improvement in creep strength in a Nickel-base single crystal superalloy by heat treatement[J].Materials Science and Engineering,1983,61:173-181.
[8] Pollock T M,Argon A S.Directional coarsening in nickel-base single crystals with high fraction of precipitates[J].Acta Metallurgica,1994,42:1859-1874.
[9] Nabarro F R N.Rafting in superalloy[J].Metallurgical and Materials Transactions A,1996,27:513-530.
[10] 田素贵,杜洪强,王春涛,等.W含量对单晶镍基合金组织与性能的影响[J].航空材料学报,2006,26(3):16-19.TIAN Su-gui,DU Hong-qiang,Wang Chun-tao,et al.Influence of W concentration on microstructure and properties of single Crystal nickel base superalloy[J].Journal of Aeronautical Materials,2006,26(3):16-19.
[11] Socrate S,Parks D M.Numerical determination of the elastic driving force for directional coarsening in nickel-superalloy[J].Acta Metallurgica ET Materialia,1993,41:2185-2209.
[12] Tien J K,Copley S M.The effect of uniaxial stress on the periodic morphology of coherent gamma prime precipitates in Nickel-base superalloy single crystasl[J].Metallurgical and Materials Transactions,1971,2:215-129.
[13] 于庆民,岳珠峰.镍基单晶合金中空穴绕夹杂形核及后续演化的有限元分析[J].航空学报,2009,30(1):179-181.YU Qing-min,YUE Zhu-feng.Finite element analysis on void nucleation and growth around inclusion in nickel-based single crystal superalloys[J].Acta Aeronautica et Astronautica Sinica,2009,30(1):179-181.
[14] Oregan T L,Quinn D F,Howe M A,et al.Void growth simulation in single crystals[J].Computational Mechanics,1997,20:115-121.
[15] Shang S L,Kim D E,Zacher C L,et al.Effects of alloying elements and temperature on the elastic properties of dilute Ni-base superalloys from first-principles calculations[J].Journal of Applied Physics,2012,112(5):5898-5907.