电磁场下液相线等温处理对镍基高温合金凝固组织及偏析的影响
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摘要
借助光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)以及电子探针X射线显微分析仪(EPMA)等方法,系统研究镍基高温合金电磁场下液相线等温处理后的凝固组织与传统铸造组织析出相以及微观偏析的差异、有无电磁场下不同温度(1420℃、1400℃和1390℃)等温处理后凝固组织。结果表明:电磁场下近液相线等温处理后得到的组织为细小等轴晶,晶粒圆整度较好。与传统铸造组织相比,细晶铸造组织中碳化物含量少于传统铸造组织的,且碳化物更为细小,分布更弥散。电磁场下近液相线等温处理得到组织偏析系数更接近于1,微观偏析较小。电磁场可通过均匀温度场和溶质场的方式使凝固组织细化。
The differences of macrostructure, microstructure, precipitate and microsegregation of solidification structure by isothermal treatment near the liquids in electromagnetic field and traditional casting of Ni-based superalloy were investigated by optical microscope(OM), X-ray diffractometer(XRD), scanning electron microscopy(SEM) and electron probe X-ray microanalyzer(EPMA). The results show that the microstructure is small and uniform equiaxed grain by isothermal treatment near the liquidus and electromagnetic field. Compared with traditional microstructure, the content of carbide in fine grained casting is less than that of traditional casting, and the carbide is smaller and more dispersed than that of traditional casting. The segregation coefficient of the microstructure by isothermal treatment near the liquidus and electromagnetic field is closer to 1. The electromagnetic field can refine microstructure by making the temperature field and the solute field become more uniform.
The differences of macrostructure, microstructure, precipitate and microsegregation of solidification structure by isothermal treatment near the liquids in electromagnetic field and traditional casting of Ni-based superalloy were investigated by optical microscope(OM), X-ray diffractometer(XRD), scanning electron microscopy(SEM) and electron probe X-ray microanalyzer(EPMA). The results show that the microstructure is small and uniform equiaxed grain by isothermal treatment near the liquidus and electromagnetic field. Compared with traditional microstructure, the content of carbide in fine grained casting is less than that of traditional casting, and the carbide is smaller and more dispersed than that of traditional casting. The segregation coefficient of the microstructure by isothermal treatment near the liquidus and electromagnetic field is closer to 1. The electromagnetic field can refine microstructure by making the temperature field and the solute field become more uniform.
引文
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[17]KHALIFA W,TSUNEKAWA Y.Production of grain-refined AC7A Al-Mg alloy via solidification in ultrasonic field[J].Transactions of Nonferrous Metals Society of China,2016,26(4):930-937.
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[19]BAI Guang-hai,LI Jin-shan,HU Rui,TANG Zeng-wu,XUEXiang-yi,FU Heng-zhi.Effect of temperature on tensile behavior of Ni-Cr-W based superalloy[J].Materials Science and Engineering A,2011,528:1974-1978.
[2]GAO Zhong-tang,GUO Wei,ZHANG Chuan-wei,TANJin-qiang.Development of fine-grained structure in Ni-Cr-Wbased superalloy and its effect on the mechanical properties[J].Materials Science and Engineering A,2017,682:156-163.
[3]CHAUDHURIA A,RAGHUPATHYA Y,SRINIVASANB D,SUWASA S.Microstructural evolution of cold-sprayed Inconel 625 superalloy coatings on low alloy steel substrate[J].Acta Materialia,2017,129:11-25.
[4]ZHANG Xiao-rong,GUO Jing,LIU Hai-peng,SONGYue-peng,XU Ling-feng,LIU Jing-tao.Influence of melt superheat treatment on corrosion resistance of Gd-based BMG in 3.5%NaCl solution[J].Materials Design,2016,100:217-222.
[5]MATUSZEWSKI K,RETTIG R,MATYSIAK H,PENG Z,POVSTUGAR I.Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of3rd and 4th generation[J].Acta Materialia,2015,95:274-283.
[6]CAMPO K,LOPES E,PARRISH C,CARAM R.Rapid quenching of semisolid Ti-Cu alloys:Insights into globular microstructure formation and coarsening[J].Acta Materialia,2017,139:199-210.
[7]戴贤创,李振锋,陈继光,丁晗晖,吴红宇,刘锋,江亮.镍基高温合金端淬梯度冷却过程中γ′相演化规律[J].中国有色金属学报,2017,27(2):258-264.DAI Xian-chuang,LI Zhen-feng,CHEN Ji-guang,DINGHan-hui,WU Hong-yu,LIU Feng,JIANG Liang.Gamma prime phase evolution rule during end quench cooling in nickel-based superalloy[J].The Chinese Journal of Nonferrous Metals,2017,27(2):258-264.
[8]张志强,乐启炽,崔建忠.电磁场施加方式对半连续铸造镁合金锭坯组织与性能的影响[J].稀有金属材料与工程,2009,38(8):1467-1471.ZHANG Zhi-qiang,LE Qi-chi,CUI Jian-zhong.Effect of different electromagnetic field application ways on microstructures and mechanical properties of semi-continuous cast magnesium alloy billets[J].Rare Metal Materials and Engineering,2009,38(8):1467-1471.
[9]FATOUMATA S,YVES D,ANTOINE A.Electromagnetic stirring and retention to improve segregation in silicon for photovoltaics[J].Journal of Crystal Growth,2012,340:41-46.
[10]冀焕明,罗天骄,杨院生.AZ80镁合金低压脉冲磁场半连续铸造过程的数值模拟和实验研究[J].中国有色金属学报,2017,27(3):468-475.JI Huan-ming,LUO Tian-jiao,YANG Yuan-sheng.Numerical simulation and experimental research of low voltage pulsed magnetic field DC casting of AZ80magnesium alloy[J].The Chinese Journal of Nonferrous Metals,2017,27(3):468-475.
[11]FATCHURROHMAN N,SULAIMAN S.Solidification analysis in permanent mould casting of aluminium alloy lm6reinforced titanium carbide particulates metal matrix composites[J].Materials Science Forum,2017,889:148-151.
[12]WANG Jiang,YUE Shen,FAUTRELLE Y,PETER D,RENZhong-min.Refinement and growth enhancement of Al2Cu phase during magnetic field assisting directional solidification of hypereutectic Al-Cu alloy[J].Scientific Reports,2016,5:53-57.
[13]HAGHAYEGHI R,NASTAC L.On microstructural refinement of an AA7449 aluminium alloy through shearing above liquidus temperature[J].Materials Letter,2011,65:3230-3234.
[14]WANG Kai,LIU Chang-ming,ZHAI Yan-bo,ZOU Mao-hua.Microstructural characteristics of near-liquidus cast AZ91Dalloy during semi-solid die casting[J].Transaction of Nonferrous Metals Society of China,2010,20(1):170-171.
[15]张可人,谢发勤,胡锐,吴向清.深过冷K4169高温合金凝固组织演变和力学性能的关系[J].中国有色金属学报,2016,26(7):1885-1991.ZHANG Ke-ren,XIE Fa-qin,HU Rui,WU Xiang-qing.Relationship between microstructure and mechanical properties of undercooled K4169 superalloy[J].The Chinese Journal of Nonferrous Metals,2016,26(7):1885-1991.
[16]余建波,侯渊,张超,杨志彬,王江,任忠鸣.静磁场对新型Co-Al-W基高温合金定向凝固组织的影响[J].金属学报,2017,53(12):1620-1626.YU Jian-bo,HOU Yuan,ZHANG Chao,YANG Zhi-bin WANG Jiang,REN Zhong-ming.Effect of high magnetic field on the microstructure in directionally solidified Co-Al-W alloy[J].Acta Metallurgica Sinica,2017,53(12):1620-1626.
[17]KHALIFA W,TSUNEKAWA Y.Production of grain-refined AC7A Al-Mg alloy via solidification in ultrasonic field[J].Transactions of Nonferrous Metals Society of China,2016,26(4):930-937.
[18]SRIRANGAM P,KRAMER M,SHANKAR S.Effect of strontium on liquid structure of Al-Si hypoeutectic alloys using high-energy X-ray diffraction[J].Acta Materialia,2011,59:503-513.
[19]BAI Guang-hai,LI Jin-shan,HU Rui,TANG Zeng-wu,XUEXiang-yi,FU Heng-zhi.Effect of temperature on tensile behavior of Ni-Cr-W based superalloy[J].Materials Science and Engineering A,2011,528:1974-1978.
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