熔速对IN718合金真空自耗铸锭组织的影响
|
摘要
以IN718合金ϕ508 mm真空自耗铸锭为研究对象,采用光学显微镜和扫描电镜等研究了低、中和高3种熔速下其低倍、高倍的组织特征。结果表明:不同熔速铸锭两侧枝晶生长方式基本相同,边缘均是细密的柱状枝晶;随着熔速升高熔池明显加深,铸锭两侧对称性变差,柱状晶生长方向与轴向的角度增大,铸锭中心部位组织由柱状晶向等轴晶转化;随熔速升高铸锭中心和R/2部位的二次枝晶间距略有增大,中心部位二次枝晶间距稍大于R/2部位;高熔速的中心和R/2部位二次枝晶干变得粗大,甚至出现互相熔合的现象;不同熔速对铸锭中Laves相析出数量影响不大;而在同一熔速下铸锭Laves相析出数量中心部位多于R/2部位,明显高于边缘部位。
Macrostructure and microstructure characteristics of IN718 alloy ϕ508 mm vacuum arc remelting(VAR) ingots at low, medium and high melting rates were studied by means of optical microscope and scanning electron microscopy. The results show that the growth mode of dendrites is basically the same on both sides of the ingot at different melting rates, and the edge is all fine columnar dendrite. With the increase of melting rate, the depth of the molten pool is obviously increased, the symmetry on both sides of the ingot becomes worse, the angle between the columnar crystals growth direction and axis increases, and the structure of the central part of the ingot changes from columnar crystal to equiaxed crystal. With the increase of melting rate, the secondary dendrite spacing in the central and the R/2 part of the ingot increases slightly, and the secondary dendrite spacing in the central part is slightly larger than the R/2 part. The secondary dendrites become coarse and even fuse with each other in the center and the R/2 part of the ingot with high melting rate, and different melting rates have little effect on the amount of Laves phase in the ingot. At the same melting rate, the number of Laves precipitates in the central part is more than that in the R/2 part, which is obviously higher than that in the edge part.
Macrostructure and microstructure characteristics of IN718 alloy ϕ508 mm vacuum arc remelting(VAR) ingots at low, medium and high melting rates were studied by means of optical microscope and scanning electron microscopy. The results show that the growth mode of dendrites is basically the same on both sides of the ingot at different melting rates, and the edge is all fine columnar dendrite. With the increase of melting rate, the depth of the molten pool is obviously increased, the symmetry on both sides of the ingot becomes worse, the angle between the columnar crystals growth direction and axis increases, and the structure of the central part of the ingot changes from columnar crystal to equiaxed crystal. With the increase of melting rate, the secondary dendrite spacing in the central and the R/2 part of the ingot increases slightly, and the secondary dendrite spacing in the central part is slightly larger than the R/2 part. The secondary dendrites become coarse and even fuse with each other in the center and the R/2 part of the ingot with high melting rate, and different melting rates have little effect on the amount of Laves phase in the ingot. At the same melting rate, the number of Laves precipitates in the central part is more than that in the R/2 part, which is obviously higher than that in the edge part.
引文
[1] 王慧.金属材料冶炼工艺学[M].北京:冶金工艺出版社,1995.
[2] 姜周华,董艳伍,李花兵,等.特殊钢特种冶金技术的新发展[J].中国冶金,2011,21(12):1-10.JIANG Zhou-hua,DONG Yan-wu,LI Hua-bing,et al.Development of special melting technology for special steel[J].China Metallurgy,2011,21(12):1-10.
[3] 郭建亭.高温合金材料学(中册)—制备工艺[M].北京:科学出版社,2008.
[4] 董建新.高温合金GH4738及应用[M].北京:冶金工艺出版社,2014.
[5] Du J H,Lü X D,Deng Q,et al.Effect of solution treatment on the microstructure and mechanical properties of IN718 alloy[J].Rare Metal Materials and Engineering,2017,46(9):2359-2365.
[6] Pollock T M,Tin S.Nickel-based superalloys for advanced turbine engines:chemistry,microstructure and properties[J].Journal of Propulsion and Power,2006,22(2):361-374.
[7] Schwant R C,Thamboo S V,Anderson A F,et al.Large 718 forgings for land based turbines[C]//Superalloys 718,625,706 and Various Derivatives,Warrendale,1997:141-152.
[8] 赵新宝,谷月峰,鲁金涛,等.GH4169 合金的研究新进展[J].稀有金属材料与工程,2015,44(3):768-774.ZHAO Xin-bao,GU Yue-feng,LU Jin-tao,et al.New research development of superalloy GH4169[J].Rare Metal Materials and Engineering,2015,44(3):768-774.
[9] 赵立华,张艳姝,吴桂芳.GH4169 高温合金的静态再结晶动力学[J].材料热处理学报,2015,36(5):217-222.ZHAO Li-hua,ZHANG Yan-shu,WU Gui-fang.Static recrystallization dynamic behavior of GH4169 superalloy[J].Transactions of Materials and Heat Treatment,2015,36(5):217-222.
[10] 仲增墉,庄景云.变形高温合金生产工艺中几个重要问题的研究和进展[J].钢铁研究学报,2003,15(7):1-9.ZHONG Zeng-yong,ZHUANG Jing-yun.Development of several important problems on producing technologies of wrought superalloy[J].Journal of Iron and Steel Research,2003,15(7):1-9.
[11] Auburtin P,Wang T,Cockcroft S L,et al.Freckle formation and freckle criterion in superalloy castings[J].Metallurgical and Materials Transactions B,2000,31B(8):801-811.
[12] Kermanpur A,Evans D G,Siddall R J,et al.Effect of process parameters on grain structure formation during VAR of INCONEL alloy 718[J].Journal of Materials Science,2004,39(24):7175-7182.
[13] 朱鸣芳,邢丽科,方辉,等.合金凝固枝晶粗化的研究进展[J].金属学报,2018,54(5):789-800.ZHU Ming-fang,XING Li-ke,FANG Hui,et al.Progresses in dendrite coarsening during solidification of alloys[J].Acta Metallurgica Sinica,2018,54(5):789-800.
[14] 翟慎秋,魏亚杰,吴德海.金属树枝晶的生长行为[J].山东工业大学学报,1997,27(2):181-187.ZHAI Shen-qiu,WEI Ya-jie,WU De-hai.Metal dendrite growth behavior[J].Journal of Shandong University of Technology,1997,27(2):181-187.
[15] 庄景云,杜金辉,邓群,等.变形高温合金GH4169[M].北京:冶金工业出版社,2006.
[16] 施琦,王磊,王杰.新型熔炼工艺下GH4169合金的凝固组织控制研究[J].材料科学与工艺,2015,23(5):65-70.SHI Qi,WANG Lei,WANG Jie.Microstructure control of GH4169 alloy during a new melting and solidification process[J].Materials Science and Technology,2015,23(5):65-70.Effect of melting rate on microstructure of IN718 alloy vacuum arc remelting ingot WANG Zi-xing, WANG Lei, SUN Wen-ru(91)Corrosion behavior of X80 pipeline steel with different microstructure under AC interference in alkaline soil environment ZHU Min, WANG Ya-ming, YUAN Yong-feng, YIN Si-min, GUO Shao-yi(98)
[2] 姜周华,董艳伍,李花兵,等.特殊钢特种冶金技术的新发展[J].中国冶金,2011,21(12):1-10.JIANG Zhou-hua,DONG Yan-wu,LI Hua-bing,et al.Development of special melting technology for special steel[J].China Metallurgy,2011,21(12):1-10.
[3] 郭建亭.高温合金材料学(中册)—制备工艺[M].北京:科学出版社,2008.
[4] 董建新.高温合金GH4738及应用[M].北京:冶金工艺出版社,2014.
[5] Du J H,Lü X D,Deng Q,et al.Effect of solution treatment on the microstructure and mechanical properties of IN718 alloy[J].Rare Metal Materials and Engineering,2017,46(9):2359-2365.
[6] Pollock T M,Tin S.Nickel-based superalloys for advanced turbine engines:chemistry,microstructure and properties[J].Journal of Propulsion and Power,2006,22(2):361-374.
[7] Schwant R C,Thamboo S V,Anderson A F,et al.Large 718 forgings for land based turbines[C]//Superalloys 718,625,706 and Various Derivatives,Warrendale,1997:141-152.
[8] 赵新宝,谷月峰,鲁金涛,等.GH4169 合金的研究新进展[J].稀有金属材料与工程,2015,44(3):768-774.ZHAO Xin-bao,GU Yue-feng,LU Jin-tao,et al.New research development of superalloy GH4169[J].Rare Metal Materials and Engineering,2015,44(3):768-774.
[9] 赵立华,张艳姝,吴桂芳.GH4169 高温合金的静态再结晶动力学[J].材料热处理学报,2015,36(5):217-222.ZHAO Li-hua,ZHANG Yan-shu,WU Gui-fang.Static recrystallization dynamic behavior of GH4169 superalloy[J].Transactions of Materials and Heat Treatment,2015,36(5):217-222.
[10] 仲增墉,庄景云.变形高温合金生产工艺中几个重要问题的研究和进展[J].钢铁研究学报,2003,15(7):1-9.ZHONG Zeng-yong,ZHUANG Jing-yun.Development of several important problems on producing technologies of wrought superalloy[J].Journal of Iron and Steel Research,2003,15(7):1-9.
[11] Auburtin P,Wang T,Cockcroft S L,et al.Freckle formation and freckle criterion in superalloy castings[J].Metallurgical and Materials Transactions B,2000,31B(8):801-811.
[12] Kermanpur A,Evans D G,Siddall R J,et al.Effect of process parameters on grain structure formation during VAR of INCONEL alloy 718[J].Journal of Materials Science,2004,39(24):7175-7182.
[13] 朱鸣芳,邢丽科,方辉,等.合金凝固枝晶粗化的研究进展[J].金属学报,2018,54(5):789-800.ZHU Ming-fang,XING Li-ke,FANG Hui,et al.Progresses in dendrite coarsening during solidification of alloys[J].Acta Metallurgica Sinica,2018,54(5):789-800.
[14] 翟慎秋,魏亚杰,吴德海.金属树枝晶的生长行为[J].山东工业大学学报,1997,27(2):181-187.ZHAI Shen-qiu,WEI Ya-jie,WU De-hai.Metal dendrite growth behavior[J].Journal of Shandong University of Technology,1997,27(2):181-187.
[15] 庄景云,杜金辉,邓群,等.变形高温合金GH4169[M].北京:冶金工业出版社,2006.
[16] 施琦,王磊,王杰.新型熔炼工艺下GH4169合金的凝固组织控制研究[J].材料科学与工艺,2015,23(5):65-70.SHI Qi,WANG Lei,WANG Jie.Microstructure control of GH4169 alloy during a new melting and solidification process[J].Materials Science and Technology,2015,23(5):65-70.Effect of melting rate on microstructure of IN718 alloy vacuum arc remelting ingot WANG Zi-xing, WANG Lei, SUN Wen-ru(91)Corrosion behavior of X80 pipeline steel with different microstructure under AC interference in alkaline soil environment ZHU Min, WANG Ya-ming, YUAN Yong-feng, YIN Si-min, GUO Shao-yi(98)
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |