均匀化处理对铸态GH625合金组织的影响
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摘要
利用光学显微镜、扫描电镜和能谱分析等研究了采用真空感应熔炼和保护气氛电渣重熔工艺生产的GH625合金的铸态组织和均匀化热处理后的微观组织。结果表明:采用双联工艺生产的GH625合金电渣锭存在枝晶和元素偏析,其中Nb、Mo、Ti元素为主要偏析元素;均匀化热处理后枝晶消除明显,块状及条状碳化物碎化,棱角钝化;相同均匀化热处理工艺下Ti、Mo、Nb达到均匀化的难度依次加大;GH625合金最佳的均匀化热处理的工艺为1200℃保温24 h。
The as-cast and homogenized microstructure of GH625 alloy produced by vacuum induction melting and electroslag remelting in protective atmosphere were studied by means of optical microscope, scanning electron microscopy and energy dispersive analysis. The results show that there are dendrite and element segregation in the GH625 alloy electroslag ingot, in which Nb, Mo and Ti elements are the main segregation elements. After homogenization heat treatment, the dendrite is eliminated obviously, and the block and strip carbides are broken up and angle-passivated. Under the same homogenization heat treatment process, the difficulty of Ti,Mo and Nb homogenization is increased in turn. The optimal homogenization heat treatment process for the GH625 alloy is holding at 1200 ℃ for 24 h.
The as-cast and homogenized microstructure of GH625 alloy produced by vacuum induction melting and electroslag remelting in protective atmosphere were studied by means of optical microscope, scanning electron microscopy and energy dispersive analysis. The results show that there are dendrite and element segregation in the GH625 alloy electroslag ingot, in which Nb, Mo and Ti elements are the main segregation elements. After homogenization heat treatment, the dendrite is eliminated obviously, and the block and strip carbides are broken up and angle-passivated. Under the same homogenization heat treatment process, the difficulty of Ti,Mo and Nb homogenization is increased in turn. The optimal homogenization heat treatment process for the GH625 alloy is holding at 1200 ℃ for 24 h.
引文
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[18] 梅声勇,郑磊,蒙肇斌,等.GH105合金铸锭元素偏析和均匀化工艺[J].北京科技大学学报,2009,31(6):714-718.MEI Sheng-yong,ZHENG Lei,MENG Zhao-bin,et al.Microsegregation and homogenization of GH105 superalloy ingots[J].Journal of University of Science and Technology Beijing,2009,31(6):714-718.
[19] Karunaratne M S A,Cox D C,Carter P,et al.Modelling of the microsegregation in CMSX-4 superalloy and its homogenization during heat treatment[J].The Minerals,Metals and Materials Society,2000:263-272.
[20] Semiatin S L,Kramb R C,Turner R E,et al.Analysis of the homogenization of a nickel-base superalloy[J].Scripta Materialia,2004,51(6):491-495.
[21] Pan X L,Yu H Y,Tu G F,et al.Segregation and diffusion behavior of niobium in a highly alloyed nickel-base superalloy[J].Transactions of Nonferrous Metals Society of China,2011,21(11):2402-2407.
[2] 冶军.美国镍基高温合金[M].北京:科学出版社,1978.
[3] 张红斌.国外Inconel 625合金的进展[J].特钢技术,2000,8(3):69-80.ZHANG Hong-bin.A review of the study on alloy 625 in abroad[J].Special Steel Technology,2000,8(3):69-80.
[4] Rodrigue Z R,Hayes R W,Berbon P B,et al.Tensile and creep behavior of cryomilled Inco 625[J].Acta Materialia,2003,51(4):911-929.
[5] Mathew M D,Rao K B S,Mannan S L.Creep properties of service-exposed alloy 625 after resolution annealing treatment[J].Materials Science and Engineering A,2004,372(1/2):327-333.
[6] Dinda G P,Dasgupta A K,Mazumder J.Laser aided direct metal deposition of Inconel 625 superalloy:microstructural evolution and thermal stability[J].Materials Science and Engineering A,2009,509(1):98-104.
[7] 孙锋,梅林波,刘松锋,等.625合金凝固偏析的理论分析[J].热力透平,2016,45(1):46-50.SUN Feng,MEI Lin-bo,LIU Song-feng,et al.Theroetic analysis on solidification segregation on alloy 625[J].Thermal turbine,2016,45(1):46-50.
[8] Cieslak M J,Headley T J,Kollie T,et al.A melting and solidification study of alloy 625[J].Metallurgical Transactions A,1988,19(9):2319-2331.
[9] 王浩宇,董建新,张麦仓,等.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,et al.Effect of casting temperature on the microstructure of as-cast GH625 alloy[J].Chinise Journal of Engineering,2015,37(11):1469-1476.
[10] Flemings M C.Solidification processing[J].Metallurgical Transactions,1974,5(10):2121-2134.
[11] 吴赟,聂义宏,赵帅,等.改型617 合金的铸态组织特征及均匀化工艺[J].材料热处理学报,2015,36(7):150-156.WU Yun,NIE Yi-hong,ZHAO Shuai,et al.As-cast microstructure and homogenization process of modified alloy 617[J].Transctions of Materials and Heat Treatment,2015,36(7):150-156.
[12] 江河,董建新,张麦仓,等.700 ℃超超临界锅炉材料617B合金铸态组织及均匀化工艺[J].北京科技大学学报,2014,36(6):795-802.JIANG He,DONG Jian-xin,ZHANG Mai-cang,et al.Microstructure and homogenization of as-cast 617B alloy for 700 ℃ultra- supercritical boilers[J].Journal of University of Science and Technology Beijing,2014,36(6):795-802.
[13] 李金国,于金江,赵乃仁,等.一种镍基单晶高温合金的显微偏析行为[J].钢铁研究学报,2003,15(7):260-263.LI Jin-guo,YU Jin-jiang,ZHAO Nai-ren,et al.Microsegregation behavior of a nickel-base single crystal superalloy[J].Journal of Iron and Steel Research,2003,15(7):260-263.
[14] 王珏,吴赟,董建新,等.700 ℃超超临界锅炉材料GH4700 合金铸态组织及均匀化工艺[J].稀有金属材料与工程,2013,42(9):1908-1914.WANG Jue,WU Yun,DONG Jian-xin,et al.Microstructure and homogenization of as-cast GH4700 alloy for 700 ℃ ultra-supercritical boilers[J].Rare Metal Materials and Engineering,2013,42(9):1908-1914.
[15] 朱冠妮,毕中南,董建新,等.镍基耐蚀合金C2276铸锭元素偏析和均匀化工艺[J].北京科技大学学报,2010,32(5):628-633.ZHU Guan-ni,BI Zhong-nan,DONG Jian-xin,et al.Microsegregation and homogenization of nickel base corrosion resistant alloy C2276 ingots[J].Journal of University of Science and Technology Beijing,2010,32(5):628-633.
[16] Hillert M.合金扩散和热力学[M].赖和怡,刘国勋译,北京:冶金工业出版社,1984.
[17] Liu X Y,Pan Q L,FAN X,et al.Microstructural evolution of Al-Cu-Mg-Ag alloy during homogenization[J].Journal of Alloys and Compounds,2009,484(1):790-794.
[18] 梅声勇,郑磊,蒙肇斌,等.GH105合金铸锭元素偏析和均匀化工艺[J].北京科技大学学报,2009,31(6):714-718.MEI Sheng-yong,ZHENG Lei,MENG Zhao-bin,et al.Microsegregation and homogenization of GH105 superalloy ingots[J].Journal of University of Science and Technology Beijing,2009,31(6):714-718.
[19] Karunaratne M S A,Cox D C,Carter P,et al.Modelling of the microsegregation in CMSX-4 superalloy and its homogenization during heat treatment[J].The Minerals,Metals and Materials Society,2000:263-272.
[20] Semiatin S L,Kramb R C,Turner R E,et al.Analysis of the homogenization of a nickel-base superalloy[J].Scripta Materialia,2004,51(6):491-495.
[21] Pan X L,Yu H Y,Tu G F,et al.Segregation and diffusion behavior of niobium in a highly alloyed nickel-base superalloy[J].Transactions of Nonferrous Metals Society of China,2011,21(11):2402-2407.