长时间时效对GH625合金析出相和拉伸性能的影响
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摘要
采用扫描电镜、透射电镜、X射线衍射、拉伸实验研究长时时效对GH625合金析出相及其拉伸性能的影响,并采用绝热法和Rietveld全谱拟合法对合金在720℃长时时效过程中主要析出相的体积分数进行了定量分析,进一步研究了析出相的体积分数与合金拉伸性能的关系。结果表明:GH625合金在720℃长时间时效过程中存在着γ相→γ′相→γ″相→δ相的转变;随着时效时间的延长,γ″相与δ相的体积分数始终在增大,而γ′相的体积分数则先增加后减少。析出相对GH625合金的拉伸性能有较大的影响。γ′相和γ″相的析出能够提高合金的强度,但大量尺寸过大的γ″相对合金的塑性不利;大量δ相的析出和长大使得合金的强度减小,但屈服强度比有所增加,而合金塑性则大幅降低。
The effect of long-time aging on the precipitated phase and tensile properties of GH625 alloy was investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffractiometry and tensile tests.Using heat insulation method and Rietveld full spectrum fitting method, the volume fractions of the main precipitated phases of GH625 alloy during thermal aging were quantitatively analyzed. The relationship between volume fraction of precipitated phases and tensile properties was further analyzed. The results show that the γ phase in the microstructure of GH625 alloy transforms into γ′ phase, γ″ phase and δ phase in sequence during long-time aging at 720 ℃.With aging time prolonging, the volume fractions of γ″ phase and δ phase increase, and the volume fraction of the γ′ phase increases firstly and then decreases. The tensile properties of GH625 alloy are significantly affected by the precipitated phases. The γ′phase and γ″ phase can improve the strength of the alloy, but the γ″ phase with large size is not good to the plasticity of the alloy. The precipitation and growth of the large amount of δ phase decrease the strength of the alloy, but increase the yield ratio, while the plasticity of the alloy decreases greatly.
The effect of long-time aging on the precipitated phase and tensile properties of GH625 alloy was investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffractiometry and tensile tests.Using heat insulation method and Rietveld full spectrum fitting method, the volume fractions of the main precipitated phases of GH625 alloy during thermal aging were quantitatively analyzed. The relationship between volume fraction of precipitated phases and tensile properties was further analyzed. The results show that the γ phase in the microstructure of GH625 alloy transforms into γ′ phase, γ″ phase and δ phase in sequence during long-time aging at 720 ℃.With aging time prolonging, the volume fractions of γ″ phase and δ phase increase, and the volume fraction of the γ′ phase increases firstly and then decreases. The tensile properties of GH625 alloy are significantly affected by the precipitated phases. The γ′phase and γ″ phase can improve the strength of the alloy, but the γ″ phase with large size is not good to the plasticity of the alloy. The precipitation and growth of the large amount of δ phase decrease the strength of the alloy, but increase the yield ratio, while the plasticity of the alloy decreases greatly.
引文
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[11]SUAVE L M,CORMIER J,VILLECHAISE P,SOULA A,HERVIER Z,BERTHEAV D,LAIGO J.Microstructural evolutions during thermal aging of alloy 625:Impact of temperature and forming process[J].Metallurgical and Materials Transactions A,2014,45(7):2963-2982.
[12]陈箎,丁树深,王岫文.镍基高温合金中位错与γ′相的交互作用[J].金属学报,1965,8(2):232-236.CHEN Chi,TING Shu-shen,WANG Hsiu-wen.A study of the interaction of dislocations withγ′-precipitates in nickel-base high temperature alloys[J].Acta Metallurgica Sinica,1965,8(2):232-236.
[13]MATHEW M D,MURTY K L,RAO K B S,MANNAN S L.Evaluation of mechanical properties of aged alloy 625 nickel base superalloy using nondestructive ball indentation technique[C]//Transactions of the 15th International Conference on Structural Mechanics in Reactor Technology.Amsterdam:North-Holl and Publishing Co.,1999:285-292.
[14]RENHOF L,GUDER S,WERNER E.Hardness and phase analysis of IN 718 deformed at high strain rate[J].Analytical and Bioanalytical Chemistry,2004,379(4):619-621.
[15]胡壮麒,彭平,刘轶,金涛,孙晓峰,管恒荣.镍基合金中γ′相界面的强化设计[J].金属学报,2002,38(11):1121-1126.HU Zhuang-qi,PENG Ping,LIU Yi,JIN Tao,SUN Xiao-feng,GUAN Heng-rong.Design ofγ′phase Interface strengthening of nickel-base superalloy[J].Acta Metallurgica Sinica,2002,38(11):1121-1126.
[16]SUNDARARAMAN M,MUKHOPADHYAY P,BANERJEE S.Some aspects of the precipitation of metastable intermetallic phase in Inconel718[J].Metall Trans A,1992,23(7):2015-2028.
[2]周海涛,刘志超,温盛发,李伟东.GH625合金的动态再结晶行为研究[J].稀有金属材料与工程,2012,41(11):1917-1922.ZHOU Hai-tao,LIU Zhi-chao,WEN Sheng-fa,LI Wei-dong.Dynamic recrystallization behavior of GH625 superalloy during hot deformation[J].Rare Metal Materials and Engineering,2012,41(11):1917-1922.
[3]王浩宇,董建新,张麦仓,郑磊,姚志浩,章清泉.浇注温度对GH625合金铸态显微组织的影响[J].工程科学学报,2015,37(11):1469-1476.WANG Hao-yu,DONG Jian-xin,ZHANG Mai-cang,ZHENGLei,YAO Zhi-hao,ZHANG Qing-quan.Effect of casting temperature on the microstructure of as-cast GH625 alloy[J].Chinese Journal of Engineering,2015,37(11):1469-1476.
[4]赵宇新.GH625合金的冷变形及其对力学性能的影响[J].材料工程,2000,14(9):36-37.ZHAO Yu-xin.Cold deformation behaviors of GH625 alloy and their effects on the mechanical properties[J].Journal of Materials Engineering,2000,14(9):36-37.
[5]RAJANI ZAREIE H R,AILBARI MOUSAVI S A A.The effect of explosive welding parameters on metallurgical and mechanical interfacial features of Inconel 625/plain carbon steel bimetal plate[J].Materials Science and Engineering A,2012,556:454-464.
[6]GU Yu-li,TAO Chun-hu,WEI Zhen-wei,LIU Chang-kui.Microstructural evolution and mechanical properties of TIGwelded superalloy GH625[J].Transactions of Nonferrous Metals Society of China,2016,26(1):100-106.
[7]马红旭,李友国.硅钢中析出物的尺寸分布以及体积分数的测定[J].材料科学与工程,2002,20(3):328-330.MA Hong-xu,LI You-guo.Measurement of size distribution and volume fraction of precipitates in silicon steel[J].Materials Science and Engineering,2002,20(3):328-330.
[8]权淑丽,王炜.X射线衍射法测定热轧带钢氧化皮中相的含量[J].物理测试,2015,33(2):22-25.QUAN Shu-li,WANG Wei.Determination of content of phase of hot-rolled strip oxide scale by X-ray diffraction[J].Physics Examination and Testing,2015,33(2):22-25.
[9]甘延玲,金头男,聂光临,崔素萍,郭军.全谱拟合定量分析方法及其影响因素的研究[J].分析科学学报,2016,32(1):89-94.GAN Yan-ling,JIN Tou-nan,NIE Guang-lin,CUI Su-ping,GUOJun.Study on the effecting factors of quantitative analysis by Rietveld method[J].Journal of Analytical Science,2016,32(1):89-94.
[10]凌斌,钟炳文,杨玉荣,梁学锋,沈飚.GH169合金的相变研究[J].航空材料学报,1994,14(4):1-7.LING Bin,ZHONG Bing-wen,YANG Yu-rong,LIANGXue-feng,SHEN Biao.On the phase transformation in superalloy GH169[J].Journal of Aeronautical Materials,1994,14(4):1-7.
[11]SUAVE L M,CORMIER J,VILLECHAISE P,SOULA A,HERVIER Z,BERTHEAV D,LAIGO J.Microstructural evolutions during thermal aging of alloy 625:Impact of temperature and forming process[J].Metallurgical and Materials Transactions A,2014,45(7):2963-2982.
[12]陈箎,丁树深,王岫文.镍基高温合金中位错与γ′相的交互作用[J].金属学报,1965,8(2):232-236.CHEN Chi,TING Shu-shen,WANG Hsiu-wen.A study of the interaction of dislocations withγ′-precipitates in nickel-base high temperature alloys[J].Acta Metallurgica Sinica,1965,8(2):232-236.
[13]MATHEW M D,MURTY K L,RAO K B S,MANNAN S L.Evaluation of mechanical properties of aged alloy 625 nickel base superalloy using nondestructive ball indentation technique[C]//Transactions of the 15th International Conference on Structural Mechanics in Reactor Technology.Amsterdam:North-Holl and Publishing Co.,1999:285-292.
[14]RENHOF L,GUDER S,WERNER E.Hardness and phase analysis of IN 718 deformed at high strain rate[J].Analytical and Bioanalytical Chemistry,2004,379(4):619-621.
[15]胡壮麒,彭平,刘轶,金涛,孙晓峰,管恒荣.镍基合金中γ′相界面的强化设计[J].金属学报,2002,38(11):1121-1126.HU Zhuang-qi,PENG Ping,LIU Yi,JIN Tao,SUN Xiao-feng,GUAN Heng-rong.Design ofγ′phase Interface strengthening of nickel-base superalloy[J].Acta Metallurgica Sinica,2002,38(11):1121-1126.
[16]SUNDARARAMAN M,MUKHOPADHYAY P,BANERJEE S.Some aspects of the precipitation of metastable intermetallic phase in Inconel718[J].Metall Trans A,1992,23(7):2015-2028.