形变量及时效制度对A286高温合金组织和性能的影响
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摘要
对固溶态A286合金实施不同形变量的拉拔变形,并进行不同制度时效处理。采用金相显微镜、扫描电镜和力学试验机等设备,系统分析比较了不同形变量及时效制度下合金的晶粒形态、析出相和拉伸性能的变化情况。结果表明:时效不改变合金的晶粒形态;当变形量低于30%时,合金组织为等轴晶,孪晶较多,形变量超过35%时,组织开始纤维化,晶内出现明显变形特征;对于同一时效制度,以弥散的γ'相和粒状碳化钛、碳化铬为主的析出相的数量随形变量的增大而增加,合金的抗拉强度也随之提高;对于同一形变条件,经650℃和680℃两种温度时效后γ'相呈方型,其尺寸随温度升高而增大,680℃+650℃两段时效后γ'相变成更为稳定的球型,且两段时效后的析出相数量较多,抗拉强度最高。
Different cold-drawing deformation and aging treatments were carried out on a solid-solution treated A286 superalloy.The changes of grain morphology,precipitated phase and tensile properties of the alloy under different deformation and aging conditions were systematically analyzed and compared by means of metallographic microscope,scanning electron microscope( SEM) and mechanical testing machine.The results show that the aging does not change the grain morphology of the alloy,and when the deformation is less than 30%,the microstructure of the alloy is equiaxed with many twins; while when the deformation is higher than 35%,the microstructure begins to become fibrosis with obvious deformation traces inside the grains.For the same aging condition,the amount of dispersed γ' phases mainly composed of granular titanium carbide and chromium carbide increase with the increase of deformation,and the tensile strength also increases.For the same deformation condition,the size of cubical γ' phase increases gradually when the aging temperature increases from 650 ℃ to 680 ℃,while after two-stage aging at 680 ℃ and 650 ℃,the γ' phase turns into stable spherical form,the amount of precipitated phases is much more,and the tensile strength is the highest after two-stage aging.
Different cold-drawing deformation and aging treatments were carried out on a solid-solution treated A286 superalloy.The changes of grain morphology,precipitated phase and tensile properties of the alloy under different deformation and aging conditions were systematically analyzed and compared by means of metallographic microscope,scanning electron microscope( SEM) and mechanical testing machine.The results show that the aging does not change the grain morphology of the alloy,and when the deformation is less than 30%,the microstructure of the alloy is equiaxed with many twins; while when the deformation is higher than 35%,the microstructure begins to become fibrosis with obvious deformation traces inside the grains.For the same aging condition,the amount of dispersed γ' phases mainly composed of granular titanium carbide and chromium carbide increase with the increase of deformation,and the tensile strength also increases.For the same deformation condition,the size of cubical γ' phase increases gradually when the aging temperature increases from 650 ℃ to 680 ℃,while after two-stage aging at 680 ℃ and 650 ℃,the γ' phase turns into stable spherical form,the amount of precipitated phases is much more,and the tensile strength is the highest after two-stage aging.
引文
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[15]Gerold V,Haberhorn H.On the critical resolved shear stress of solid solutions containing coherent precipitates[J].Physical Status Solidi B,1966,16:675-676.
[2]孙枫,王广生,佟小军.航空工业中热处理现状和发展[J].金属热处理,2014,39(1):58-66.Sun Feng,Wang Guangsheng,Tong Xiaojun.The development and current status for aviation industry heat treatment[J].Heat Treatment of Metals,2014,39(1):58-66.
[3]《工程材料实用手册》编辑委员会.变形高温合金-工程材料实用手册[M].2版.北京:中国标准出版社,2002:93-112.
[4]胡隆伟,叶文君.紧固件材料手册[M].北京:中国宇航出版社,2015:210-222.
[5]樊开伦,邹刚,裴烈勇,等.时效制度对GH2132高温合金性能的影响[J].金属热处理,2016,41(1):66-70.Fan Kailun,Zou Gang,Pei Lieyong,et al.Effect of aging on properties of GH2132 superalloy[J].Heat Treatment of Metals,2016,41(1):66-70.
[6]邰清安,关红,国振兴,等.热处理制度对GH2132合金组织性能的影响[J].材料热处理学报,2015,36(2):55-59.Tai Qingan,Guan Hong,Guo Zhenxin,et al.Effects of heat treatments on microstructure and mechanical properties of GH2132 superalloy[J].Transactions of Materials and Heat Treatment,2015,36(2):55-59.
[7]Oscar Martín,Pliar De Tiedra,Manuel San-Juan.Study of influence of gamma prime and eta phase on corrosion behavior of A286 superalloy by using electrochemical potentiokinetic techniques[J].Materials and Design,2015,87:266-271.
[8]Cicco H De,Luppo M I,Gribaudo L M,et al.Microstructural development and creep behavior in A286 supperalloy[J].Materials Characterization,2004,52:85-92.
[9]Ducki K J,Hetmanczyk M,Kuc D.Analysis of the precipitation process of the intermetallic phases in a high-temperature Fe-Ni austenitic alloy[J].Materials Chemistry and Physics,2003,81:490-492.
[10]姚志浩,阮雅婷,董建新,等.固溶时效热处理对A286合金组织演变规律的影响[J].材料热处理学报,2016,37(7):40-47.Yao Zhihao,Ruan Yating,Dong Jianxin,et al.Effect of solution and aging treatment on microstructure evolution of alloy A286[J].Transactions of Materials and Heat Treatment,2016,37(7):40-47.
[11]胡隆伟,叶文君,欧阳建文,等.时效制度对A286性能的影响[J].航空热处理,2014,23(1):86-88.Hu Longwei,Ye Wunjun,Ouyang Jianwen,et al.Effect of aging on properties of GH2132 superalloy[J].Aeronautical Heat Treatment,2014,23(1):86-88.
[12]黄乾尧,李汉康.高温合金[M].北京:冶金工业出版社,2000:80-91.
[13]郭建亭.高温合金材料学[M].北京:科学出版社,2008:335-339.
[14]孙跃军,尚勇,刘彩琴,等.Al含量对镍基高温合金组织和性能的影响[J].热加工工艺,2012,41(20):79-88.Sun Yuejun,Shang Yong,Liu Caiqin,et al.Effect of Al content on microstructure and properties of Ni-based superalloy[J].Hot Working Technology,2012,41(20):79-88.
[15]Gerold V,Haberhorn H.On the critical resolved shear stress of solid solutions containing coherent precipitates[J].Physical Status Solidi B,1966,16:675-676.