热处理对连续点式锻压激光快速成形GH4169合金组织与拉伸性能的影响
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摘要
研究了热处理对连续点式锻压激光快速成形GH4169合金显微组织和拉伸性能的影响。结果表明,980STA热处理未能使连续点式锻压激光快速成形GH4169合金发生再结晶,合金的拉伸性能达不到锻件标准。经1020STA热处理后,合金发生完全再结晶,等轴晶晶粒尺寸分布均匀,平均晶粒尺寸约为12.8μm,Laves相未被完全固溶,合金的强度和塑性超过锻件标准。1050STA热处理合金的再结晶平均晶粒尺寸约为25.3μm,Laves相完全固溶消失,与1020STA热处理合金相比,合金的强度下降而塑性上升,强度和塑性超过锻件标准。经1080STA热处理后,合金再结晶晶粒尺寸分布不均匀程度明显增大,平均晶粒尺寸约为123.6μm,与1020STA和1050STA热处理合金相比,合金的强度和塑性都大幅度下降,仅与锻件标准相当。
To transform the columnar grain in the as-deposited GH4169 alloy to the exquiaxed grain and get better mechanical properties, a block sample of GH4169 alloy has been formed by using a technology of consecutive point-mode forging and laser rapid forming(CPF-LRF). During the process of CPFLRF, GH4169 alloy was deposited by laser rapid forming firstly and then the deposited GH4169 alloy was deformed by consecutive point-mode forging. Both consecutive point-mode forging and laser rapid forming were alternately carried out until the completion of the forming of an objective part. The effects of heat treatment on the microstructures and mechanical properties of CPF-LRF GH4169 alloy have been investigated. The result shows that 980 STA heat treatment fails to lead to recrystallization of CPF-LRF GH4169 alloy, and the tensile properties of 980 STAed CPF-LRF GH4169 alloy can't meet the wrought standards.After the 1020 STA heat treatment, the average recrystal grain size of GH4169 alloy is about 12.8 mm,and Laves phase can not be dissolved completely. The tensile properties of the 1020 STAed CPF-LRF GH4169 alloy is superior to the wrought standards. Compared to the 1020 STAed CPF-LRF GH4169 alloy, the tensile strength of 1050 STAed CPF-LRF GH4169 alloy drops and its ductility increases due to complete dissolution of Laves phase and grain size increasing to 25.3 mm. The average grain size of the1080 STAed CPF-LRF GH4169 alloy is about 123.6 mm. Compared to 1020 STAed and 1050 STAed CPFLRF GH4169, the tensile properties of 1080 STAed CPF-LRF GH4169 has fallen substantially, which just satisfy the wrought standards.
To transform the columnar grain in the as-deposited GH4169 alloy to the exquiaxed grain and get better mechanical properties, a block sample of GH4169 alloy has been formed by using a technology of consecutive point-mode forging and laser rapid forming(CPF-LRF). During the process of CPFLRF, GH4169 alloy was deposited by laser rapid forming firstly and then the deposited GH4169 alloy was deformed by consecutive point-mode forging. Both consecutive point-mode forging and laser rapid forming were alternately carried out until the completion of the forming of an objective part. The effects of heat treatment on the microstructures and mechanical properties of CPF-LRF GH4169 alloy have been investigated. The result shows that 980 STA heat treatment fails to lead to recrystallization of CPF-LRF GH4169 alloy, and the tensile properties of 980 STAed CPF-LRF GH4169 alloy can't meet the wrought standards.After the 1020 STA heat treatment, the average recrystal grain size of GH4169 alloy is about 12.8 mm,and Laves phase can not be dissolved completely. The tensile properties of the 1020 STAed CPF-LRF GH4169 alloy is superior to the wrought standards. Compared to the 1020 STAed CPF-LRF GH4169 alloy, the tensile strength of 1050 STAed CPF-LRF GH4169 alloy drops and its ductility increases due to complete dissolution of Laves phase and grain size increasing to 25.3 mm. The average grain size of the1080 STAed CPF-LRF GH4169 alloy is about 123.6 mm. Compared to 1020 STAed and 1050 STAed CPFLRF GH4169, the tensile properties of 1080 STAed CPF-LRF GH4169 has fallen substantially, which just satisfy the wrought standards.
引文
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[22]Wang Z M,Guan K,Gao M,et al.The microstructure and mechanical properties of deposited-IN718 by selective laser melting[J].J.Alloys Compd.,2012,513:518
[23]Xi M Z,Liu J B,Zhao Y,et al.Microstructures of heat treatment and properties of TA15 titanium alloy formed by technology of laser rapid forming combined with continuous point forging[J].Chin.J.Lasers,2016,43:203001(席明哲,刘静波,赵毅等.连续点式锻压激光快速成形TA15钛合金热处理组织与性能[J].中国激光,2016,43:203001)
[24]Rao G A,Kumar M,Srinivas M,et al.Effect of standard heat treatment on the microstructure and mechanical properties of hot isostatically pressed superalloy Inconel 718[J].Mater.Sci.Eng.,2003,A355:114
[25]Ram G D J,Reddy A V,Rao K P,et al.Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds[J].J.Mater.Process.Technol.,2005,167:73
[2]Chang L T,Sun W R,Cui Y Y,et al.Effect of heat treatment on microstructure and mechanical properties of the hot-isostatic-pressed Inconel 718 powder compact[J].J.Alloys Compd.,2014,590:227
[3]Lambarrin J,Leunda J,Navas V G,et al.Microstructural and tensile characterization of Inconel 718 laser coatings for aeronautic components[J].Opt.Laser.Eng.,2013,51:813
[4]Zhang Q L,Yao J H,Mazumder J.Laser direct metal deposition technology and microstructure and composition segregation of Inconel 718 superalloy[J].J.Iron Steel Res.Int.,2011,18:73
[5]Chang L T,Sun W R,Cu Y Y,et al.Influences of hot-isostatic-pressing temperature on microstructure,tensile properties and tensile fracture mode of Inconel 718 powder compact[J].Mater.Sci.Eng.,2014,A599:186
[6]Mei Y P,Liu Y C,Liu C X,et al.Effects of cold rolling on the precipitation kinetics and the morphology evolution of intermediate phases in Inconel 718 alloy[J].J.Alloys Compd.,2015,649:949
[7]Rao G A,Srinivas M,Sarma D S.Effect of thermomechanical working on the microstructure and mechanical properties of hot isostatically pressed superalloy Inconel 718[J].Mater.Sci.Eng.,2004,A383:201
[8]Wang Y D,Tang H B,Fang Y L,et al.Effect of heat treatment on microstructure and mechanical properties of laser melting deposited1Cr12Ni2WMo VNb steel[J].Mater.Sci.Eng.,2010,A528:474
[9]Zhang Q,Chen J,Lin X,et al.Grain morphology control and texture characterization of laser solid Formed Ti6Al2Sn2Zr3Mo1.5Cr2Nb titanium alloy[J].J.Mater.Process.Technol.,2016,238:202
[10]Wang Y D,Tang H B,Fang Y L,et al.Microstructure and mechanical properties of laser melting deposited 1Cr12Ni2WMo VNb steel[J].Mater.Sci.Eng.,2010,A527:4804
[11]Zhu Y Y,Liu D,Tian X J,et al.Characterization of microstructure and mechanical properties of laser melting deposited Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy[J].Mater.Des.,2014,56:445
[12]Zhu Y Y,Li J,Tian X J,et al.Microstructure and mechanical properties of hybrid fabricated Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy by laser additive manufacturing[J].Mater.Sci.Eng.,2014,A607:427
[13]Liu C M,Wang H M,Tian X J,et al.Microstructure and tensile properties of laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe near b titanium alloy[J].Mater.Sci.Eng.,2013,A586:323
[14]Liu F C,Lin X,Huang C P,et al.The effect of laser scanning path on microstructures and mechanical properties of laser solid formed nickel-base superalloy Inconel 718[J].J.Alloys Compd.,2011,509:4505
[15]Liu F C,Lin X,Yang G L,et al.Microstructure and residual stress of laser rapid formed Inconel 718 nickel-base superalloy[J].Opt.Laser Technol.,2011,43:208
[16]Liu F C,Lin X,Zhao W W,et al.Effects of solution treatment temperature on microstructures and properties of laser solid forming GH4169 superalloy[J].Rare Met.Mater.Eng.,2010,39:1519
[17]Liu F C,Lin X,Yang G L,et al.Microstructures and mechanical properties of laser solid formed nickle base superalloy Inconel 718prepared in different atmospheres[J].Acta Metall.Sin.,2010,46:1047(刘奋成,林鑫,杨高林等.不同气氛激光立体成形镍基高温合金Inconel 718的显微组织和力学性能[J].金属学报,2010,46:1047)
[18]Zhao W W,Lin X,Liu F C,et al.Effect of heat treatment on microstructure and mechanical properties of laser solid forming Inconel 718 superalloy[J].Chin.J.Lasers,2009,36:3220(赵卫卫,林鑫,刘奋成等.热处理对激光立体成形Inconel 718高温合金组织和力学性能的影响[J].中国激光,2009,36:3220)
[19]Zhao X M,Chen J,Lin X,et al.Study on microstructure and mechanical properties of laser rapid forming Inconel 718[J].Mater.Sci.Eng.,2008,A478:119
[20]Song K,Yu K,Lin X,et al.Microstructure and mechanical properties of heat treatment laser solid forming superalloy Inconel 718[J].Acta Metall.Sin.,2015,51:935(宋衎,喻凯,林鑫等.热处理态激光立体成形Inconel 718高温合金的组织及力学性能[J].金属学报,2015,51:935)
[21]Zhang D Y,Niu W,Cao X Y,et al.Effect of standard heat treatment on the microstructure and mechanical properties of selective laser melting manufactured Inconel 718 superalloy[J].Mater.Sci.Eng.,2015,A644:32
[22]Wang Z M,Guan K,Gao M,et al.The microstructure and mechanical properties of deposited-IN718 by selective laser melting[J].J.Alloys Compd.,2012,513:518
[23]Xi M Z,Liu J B,Zhao Y,et al.Microstructures of heat treatment and properties of TA15 titanium alloy formed by technology of laser rapid forming combined with continuous point forging[J].Chin.J.Lasers,2016,43:203001(席明哲,刘静波,赵毅等.连续点式锻压激光快速成形TA15钛合金热处理组织与性能[J].中国激光,2016,43:203001)
[24]Rao G A,Kumar M,Srinivas M,et al.Effect of standard heat treatment on the microstructure and mechanical properties of hot isostatically pressed superalloy Inconel 718[J].Mater.Sci.Eng.,2003,A355:114
[25]Ram G D J,Reddy A V,Rao K P,et al.Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds[J].J.Mater.Process.Technol.,2005,167:73