Please wait a minute...
金属学报  2017, Vol. 53 Issue (4): 423-432    DOI: 10.11900/0412.1961.2016.00291
  本期目录 | 过刊浏览 |
Ru对一种高Cr镍基单晶高温合金凝固组织的影响
宁礼奎(),佟健,刘恩泽,谭政,纪慧思,郑志
中国科学院金属研究所 沈阳 110016
Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content
Likui NING(),Jian TONG,Enze LIU,Zheng TAN,Huisi JI,Zhi ZHENG
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
全文: PDF(10721 KB)   HTML  
摘要: 

以一种新型高Cr镍基单晶高温合金为基础,调整Ru的添加量,通过对3种不同Ru含量合金铸态组织的观察,研究了Ru对合金相析出特征与元素分布规律的影响。结果表明,随着Ru含量(0、1.5%、3%,质量分数)的增加,合金一次枝晶间距与二次枝晶间距逐渐减小,(γ+γ′)共晶含量先增后降,γ′相尺寸逐渐变小;3%的Ru添加使合金凝固组织中析出β-NiAl相,该相除Ni、Al基本组成元素外,还包含一定量的Cr、Co和Ru;Ru对合金中其它元素具有典型的“逆分配”作用,β-NiAl相的析出降低了Ru对其它元素“逆分配”的影响程度;Ru提高了正偏析元素Ta、Al和负偏析元素Re的偏析程度,降低了正偏析元素Mo、Cr的偏析程度。

关键词 单晶高温合金Ruβ-NiAl相逆分配偏析    
Abstract

Ni-based single crystal superalloys have been widely used in manufacturing the critical components of aero-engines, such as turbine blades and vanes. Improvements in phase stability on the addition of Ru are well known in the field of Ni-based superalloy development. Cr is beneficial to hot co-rrosion resistance of Ni-based superalloys. Generally, superalloys which used under easy corrosion conditions should contain high levels of Cr. Early researches about the influence of Ru on solidification microstructures in Ni-based single crystal alloys are mostly focused on low-Cr systerms (<6%). Since Cr has complex interactions with Ru, it is meanful to study the effects of Ru on solidification microstructures in high-Cr (>10%) Ni-based single crystal superalloy systems. The materials used in this work are Ni-based single crystal superalloy with high Cr content. Three superalloys by changing Ru addition (0, 1.5%, 3%, mass fraction) were designed. By observing the as-cast structure, the effect of Ru on the elements distribution and the precipitation characters of different phases in these alloys were studied. It is found that as the Ru content increases, the primary and secondary dendrite arm spacings decrease gradually; the volume fraction of (γ+γ′) eutectic increases firstly and then decreases; the γ′ size is reduced progressively. The addition of 3%Ru leads to the formation of β-NiAl phase, which contain a certain amount of Cr, Co and Ru except the basic elements Ni and Al. The typical "reverse partitioning" of other alloying elements is exhibited with the addition of Ru, while the formation of β-NiAl phase can reduce the "reverse partitioning" of other alloying elements. The addition of Ru could enhance the segregation of positive segregation elements Ta, Al and negative segregation element Re while reduce the segregation of positive segregation elements Mo and Cr.

Key wordssingle crystal superalloy    Ru    β-NiAl phase    reverse partitioning    segregation
收稿日期: 2016-07-08      出版日期: 2017-04-07
基金资助:国家自然科学基金项目 No.51501193

引用本文:

宁礼奎,佟健,刘恩泽,谭政,纪慧思,郑志. Ru对一种高Cr镍基单晶高温合金凝固组织的影响[J]. 金属学报, 2017, 53(4): 423-432.
Likui NING,Jian TONG,Enze LIU,Zheng TAN,Huisi JI,Zhi ZHENG. Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content. Acta Metall, 2017, 53(4): 423-432.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00291      或      http://www.ams.org.cn/CN/Y2017/V53/I4/423

图1  3种不同Ru含量合金的铸态组织
图2  Ru含量与枝晶间距的关系
图3  3种不同含Ru量合金的升温DSC曲线
图4  3种不同含Ru量合金的典型铸态SEM像
图5  1.5Ru合金中板状共晶形貌及EDS分析
图6  3Ru合金中新相的形貌及其EDS分析
图7  3Ru合金中新相TEM像和SAED谱
Alloy TS TL ΔT0
0Ru 1334 1381 47
1.5Ru 1336 1381 45
3Ru 1335 1380 45
表1  3种不同Ru含量的合金在DSC升温曲线上获得的相变温度
图8  3Ru合金中β-NiAl相的SEM像及元素面分布
图9  3种不同Ru含量合金的铸态γ'相形貌
Alloy Eutectic β-NiAl Eutectic+β-NiAl
0Ru 0.45 - 0.45
1.5Ru 0.75 - 0.75
3Ru 0.39 0.99 1.38
表2  3种不同Ru含量合金中(γ+γ')共晶和β-NiAl相的体积分数
Alloy Re Mo Ru W Cr Co Al Ta Ni
0Ru 0.260 0.574 - 2.073 6.378 6.698 7.889 10.371 65.757
1.5Ru 0.361 0.640 1.264 2.208 5.619 6.663 7.667 11.937 63.641
3Ru 0.576 0.951 2.507 2.623 8.238 7.442 6.883 10.966 59.814
表3  3种合金中(γ+γ')共晶相成分的比较
图10  3种不同Ru含量合金中各元素在γ /γ'相中的分配比
图11  3种不同Ru含量合金中各元素的偏析系数K
[1] Giamei A F, Anton D L.Rhenium additions to a Ni-base superalloy: Effects on microstructure[J]. Metall. Trans., 1985, 16A: 1997
doi: 10.1007/BF02662400
[2] Murakami T H H, Honma T, Koizumi Y, et al. Distribution of platinum group metals in Ni-base single-crystal superalloys [A]. Superalloys 2000[C]. Warrendale, PA: TMS, 2000: 747
[3] Yeh A C, Rae C M F, Tin S. High temperature creep of Ru-bearing Ni-base single crystal superalloys [A]. Superalloys 2004[C]. Warrendale, PA: TMS, 2004: 677
[4] Epishin A, Link T.Mechanisms of high temperature creep of nickel-base superalloys under low applied stress [A]. Superalloys 2004[C]. Warrendale, PA: TMS, 2004: 137
[5] Collins H E.The effect of thermal exposure on the microstructure and mechanical properties of nickel-base superalloys[J]. Metall. Trans., 1974, 5: 189
doi: 10.1007/BF02642943
[6] Austin C M,O'Hara K S, Darolia R, et al. New nickel base super-alloy-useful for gas turbine engine single crystal air foil [P]. US Pat, 5151249-A, 1992
[7] Rea C M F, Karunaratne M S A, Small C J, et al. Topologically close packed phases in an experimental rhenium-containing single crystal superalloy [A]. Superalloys 2000[C]. Warrendale, PA: TMS, 2000: 767
[8] Rea C M F, Reed R C. The precipitation of topologically close-packed phases in rhenium-containing superalloys[J]. Acta Mater., 2001, 49: 4113
doi: 10.1016/S1359-6454(01)00265-8
[9] Tin S, Pollock T M.Phase instabilities and carbon additions in single-crystal nickel-base superalloys[J]. Mater. Sci. Eng., 2003, A348: 111
doi: 10.1016/S0921-5093(02)00637-8
[10] Lavigne O, Ramusat C, Drawin S, et al.Relationships between microstructural instabilities and mechanical behaviour in new generation nickel-based single crystal superalloys [A]. Superalloys 2004[C]. Warrendale, PA: TMS, 2004: 667
[11] O'Hara K S,Walston W S, Ross E W, et al. Nickel base superalloy and article [P]. US Pat, 5482789-A, 1996
[12] Walston S, Cetel A, MacKay R, et al. Joint development of a fourth generation single crystal superalloy [A]. Superalloys 2004[C]. Warrendale, PA: TMS, 2004: 15
[13] Sato A, Harada H, Yokokawa T, et al.The effects of ruthenium on the phase stability of fourth generation Ni-base single crystal superalloys[J]. Scr. Mater., 2006, 54: 1679
doi: 10.1016/j.scriptamat.2006.01.003
[14] Hobbs R A, Zhang L, Rae C M F, et al. Mechanisms of topologically close-packed phase suppression in an experimental ruthenium-bearing single-crystal nickel-base superalloy at 1100 ℃[J]. Metall. Mater. Trans., 2008, 39A: 1014
doi: 10.1007/s11661-008-9490-9
[15] Feng Q, Nandy T K, Tin S, et al.Solidification of high-refractory ruthenium-containing superalloys[J]. Acta Mater., 2003, 51: 269
doi: 10.1016/S1359-6454(02)00397-X
[16] Hobbs R A, Tin S, Rae C M F, et al. Solidification characteristics of advanced nickel-base single crystal superalloys [A]. Super-alloys 2004[C]. Warrendale, PA: TMS, 2004: 819
[17] Kearsey R M, Beddoes J C, Jaansalu K M, et al.The effects of Re, W and Ru on microsegregation behaviour in single crystal super-alloy systems [A]. Superalloys 2004[C]. Warrendale, PA: TMS, 2004: 801
[18] Feng Q, Carroll L J, Pollock T M.Soldification segregation in ruthenium-containing nickel-base superalloys[J]. Metall. Mater. Trans., 2006, 37A: 1949
doi: 10.1007/s11661-006-0137-4
[19] Heckl A, Neumeier S, Goken M, et al.The effect of Re and Ru on γ/γ' microstructure, γ-solid solution strengthening and creep strength in nickel-base superalloys[J]. Mater. Sci. Eng., 2011, A528: 3435
doi: 10.1016/j.msea.2011.01.023
[20] Jin T.Role of ruthenium in Ni-based single crystal superalloys [D]. Shenyang: Institute of Metal Research, Chinese Academy of Science, 2009
[20] (金涛. 钌在镍基单晶高温合金中的作用 [D]. 沈阳: 中国科学院金属研究所, 2009)
[21] Liu G, Liu L, Zhao X B, et al.Effects of Re and Ru on the solidification characteristics of nickel-base single-crystal superalloys[J]. Metall. Mater. Trans., 2011, 42A: 2733
doi: 10.1007/s11661-011-0673-4
[22] Caldwell E C, Fela F J, Fuchs G E.Segregation of elements in high refractory content single crystal nickel based superalloys [A]. Superalloys 2004[C]. Warrendale, PA: TMS, 2004: 811
[23] Kurz W, Fisher D J.Fundamentals of Solidification[M]. Aedermannsdorf, Switzerland: Trans Tech Pub, 1998: 247
[24] Volek A, Pyczak F, Singer R F, et al.Partitioning of Re between γ and γ' phase in nickel-base superalloys[J]. Scr. Mater., 2005, 52: 141
doi: 10.1016/j.scriptamat.2004.09.013
[25] Blavette D, Caron P, Khan T.An atom-probe study of some fine-scale microstructural features in Ni-based single crystal super-alloys [A]. Superalloys 1988[C]. Warrendale, PA: TMS, 1988: 305
[26] Giamei A F, Anton D L.Rhenium additions to a Ni-base super-alloy: Effects on microstructure[J]. Metall. Mater. Trans., 1985, 16A: 1997
doi: 10.1007/BF02662400
[27] Guan X R.Investigation of effects of Ti, Cr and Re on microstructure and performance of Ni-based superalloy [D]. Shenyang: Northeastern University, 2010
[27] (管秀荣. Ti, Cr, Re对镍基高温合金组织及性能影响研究 [D]. 沈阳: 东北大学, 2010)
[28] Kearsey R M, Beddoes J C, Jones P, et al.Compositional design considerations for microsegregation in single crystal superalloy systems[J]. Intermetallics, 2004, 12: 903
doi: 10.1016/j.intermet.2004.02.041
[1] 王博,张军,潘雪娇,黄太文,刘林,傅恒志. W对第三代镍基单晶高温合金组织稳定性的影响[J]. 金属学报, 2017, 53(3): 298-306.
[2] 邹建雄,刘波,林黎蔚,任丁,焦国华,鲁远甫,徐可为. MoC掺杂钌基合金无籽晶阻挡层微结构及热稳定性研究[J]. 金属学报, 2017, 53(1): 31-37.
[3] 李军,葛鸿浩,GE Honghao,WU Menghuai,李建国. 基于热溶质对流及晶粒运动的柱状晶-非球状等轴晶混合三相模型*[J]. 金属学报, 2016, 52(9): 1096-1104.
[4] 孙元,刘纪德,侯星宇,王广磊,杨金侠,金涛,周亦胄. DD5单晶高温合金大间隙钎焊的组织演变与界面形成机制*[J]. 金属学报, 2016, 52(7): 875-882.
[5] 濮晟,谢光,王莉,潘智毅,楼琅洪. Re和W对铸态镍基单晶高温合金再结晶的影响*[J]. 金属学报, 2016, 52(5): 538-548.
[6] 郁峥嵘,丁贤飞,曹腊梅,郑运荣,冯强. 第二、三代镍基单晶高温合金含Hf过渡液相连接*[J]. 金属学报, 2016, 52(5): 549-560.
[7] 钟华,李传军,王江,任忠鸣,钟云波,玄伟东. 强磁场对定向凝固Al-4.5Cu合金微观偏析的影响*[J]. 金属学报, 2016, 52(5): 575-582.
[8] 闫二虎,孙立贤,徐芬,徐达鸣. 基于Thermo-Calc和微观偏析统一模型对Al-6.32Cu-25.13Mg合金凝固路径的预测*[J]. 金属学报, 2016, 52(5): 632-640.
[9] 王玉敏,李双明,钟宏,傅恒志. 定向凝固DD6单晶高温合金枝晶组织均匀性研究[J]. 金属学报, 2015, 51(9): 1038-1048.
[10] 杜随更,王喜锋,高漫. 单晶DD3与细晶GH4169高温合金摩擦焊接界面表征*[J]. 金属学报, 2015, 51(8): 951-956.
[11] 濮晟, 谢光, 郑伟, 王栋, 卢玉章, 楼琅洪, 冯强. W和Re对固溶态镍基单晶高温合金变形和再结晶的影响*[J]. 金属学报, 2015, 51(2): 239-248.
[12] 金涛,周亦胄,王新广,刘金来,孙晓峰,胡壮麒. 先进镍基单晶高温合金组织稳定性及力学行为的研究进展[J]. 金属学报, 2015, 51(10): 1153-1162.
[13] 张军,黄太文,刘林,傅恒志. 单晶高温合金凝固特性与典型凝固缺陷研究[J]. 金属学报, 2015, 51(10): 1163-1178.
[14] 王效光,李嘉荣,喻健,刘世忠,史振学,岳晓岱. DD9单晶高温合金拉伸性能各向异性[J]. 金属学报, 2015, 51(10): 1253-1260.
[15] 赵云松,张剑,骆宇时,唐定中,冯强. Hf对第二代镍基单晶高温合金DD11高温低应力持久性能的影响[J]. 金属学报, 2015, 51(10): 1261-1272.