Si对铸造高温合金K4169的凝固行为和力学性能的影响
Effect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169
查看参考文献22篇
|
文摘
|
依据Thermo-Calc计算结果并结合等温凝固实验,研究了含量(质量分数)为0.03%~0.65%的Si对K4169凝固特性的影响。结果表明:Si能降低合金的固、液相线温度并扩大固液两相区,当Si含量从0.03%提高到0.65%时合金的液相线温度由1354℃下降到1343℃,固相线温度由1241℃下降到1212℃。在凝固过程中Si偏析并在终凝区明显富集,Si使Nb、Mo在残余液相中的富集导致Cr和Fe的贫化。随着Si含量的提高,Laves的数量显著增加且数量增多。Si含量不同的合金中Laves相的形貌不同,Si含量为0.03%和0.23%的合金析出网状Laves相,而Si含量为0.42%Si和0.65%的合金析出大块状Laves相。Si含量对MC碳化物的形貌和析出温度影响不大。Si使K4169合金的室温拉伸性能和高温持久性能降低。Si含量由0.03%提高到0.65%时合金的强度和塑性降低,其高温持久寿命和延伸率分别从230 h和4%下降到100 h和1.8%,当Si含量高于0.23%时合金的延伸率低于指标。因此,应该合理控制K4169合金的Si含量。 |
|
其他语种文摘
|
The segregation- and precipitation- behavior of superalloy K4169 with 0.03~0.65% Si (atomic fraction) in the temperature range of 1150℃~1360℃ via thermo-calc simulation and isothermal solidification experiment. Results show that not only the temperature of solidus-liquid will decrease but also the solid-liquid two-phase region will enlarge with the existence of Si. The liquidus temperature of the alloy decreases from 1354℃ to 1343℃ and the solidus temperature drops from 1241℃ to 1212℃ with the increasing of Si content from 0.03% to 0.64%. With the increasing of Si content, the enrichment of Nb and Mo are promoted in the residual liquid phase, resulting in the depletion of Cr and Fe, while the content of Laves phase increases along with the segregation. Different morphologies are delivered of Laves phase due to the different Si contents in the alloy. The reticular Laves phase was obtained with 0.03% and 0.23% Si, while large blocky laves phase was observed with 0.42% and 0.65% Si. Si has almost no effect on the morphology and precipitation temperature of MC carbide. Si not only affects the room temperature performance of the alloy, but also the elevated temperature performance of the alloy. When the Si content increased from 0.03% to 0.65%, both of the creep-rupture life and elongation are decreased obviously. Base on these research results, as an overall consideration, it is rational to control the Si content for K4169 alloy. |
|
来源
|
材料研究学报
,2018,32(12):936-944 【核心库】
|
|
DOI
|
10.11901/1005.3093.2018.181
|
|
关键词
|
金属材料
;
K4169合金
;
等温凝固
;
元素偏析
;
Laves相
|
|
地址
|
1.
中国科学院金属研究所, 沈阳, 110016
2.
中国科学技术大学材料科学与工程学院, 沈阳, 110016
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1005-3093 |
|
学科
|
金属学与金属工艺 |
|
文献收藏号
|
CSCD:6392350
|
参考文献 共
22
共2页
|
|
1.
汤鑫. K4169合金整体导向环精铸技术及热处理工艺研究.
宇航材料工艺,2007,37(6):82
|
被引
8
次
|
|
|
|
|
2.
季根顺. 镍基高温合金K4169的高温相变研究.
兰州理工大学学报,2016,42(3):14
|
被引
3
次
|
|
|
|
|
3.
Paulonis D F. Alloy 718 at Pratt & Whitney-Historical Perspective and Future Challenges.
Superalloys,2001:13
|
被引
4
次
|
|
|
|
|
4.
Mills W J. The effect of heat treatment on the room temperature and elevated temperature fracture toughness response of alloy 718.
J. Eng. Mater. Technol,1980,102:118
|
被引
1
次
|
|
|
|
|
5.
Zhang H Y. Deformation characteristics of δ phase in the delta-processed Inconel 718 alloy.
Mater. Charact,2010,61:49
|
被引
32
次
|
|
|
|
|
6.
Whitmore L. The microstructure of heattreated nickel-based superalloy 718Plus.
Mater. Sci. Eng A,2014,610:39
|
被引
12
次
|
|
|
|
|
7.
Bieber C G. The melting of malleable nickel and nickel alloys.
Trans. Metall. Soc. AIME,1961,221:629-636
|
被引
1
次
|
|
|
|
|
8.
Holt R T. Impurities and trace elements in nickel-base superalloys.
Int. Meter. Rev,1976,21:1
|
被引
1
次
|
|
|
|
|
9.
Hu Z Q. Effect of P, S, and Si on the solidification, segregation, microstructure and mechanical properties in Fe-Ni base superalloys.
Acta Metall. Sin,1996,9:443
|
被引
2
次
|
|
|
|
|
10.
魏翔云. Mn和Si对一种Fe-Ni基高温合金持久缺口敏感性的影响.
金属学报,1984,20:A261
|
被引
1
次
|
|
|
|
|
11.
Xu Z F. The effect of silicon on precipitation and decomposition behaviors of M6C carbide in a Ni-Mo-Cr superalloy.
J. Alloy. Compd,2015,620:197
|
被引
14
次
|
|
|
|
|
12.
Meetham G W. Trace elements in superalloys-an overview.
Metals. Technol,1984,11:414
|
被引
1
次
|
|
|
|
|
13.
Douglass D L. The effect of silicon and manganese on the oxidation mechanism of Ni-20 Cr.
Oxidat. Metals,1970,2:207
|
被引
1
次
|
|
|
|
|
14.
郭建亭. 几种微量元素在高温合金中的作用与机理.
中国有色金属学报,2011,21:465
|
被引
28
次
|
|
|
|
|
15.
刘瑛. 硅在GH907低膨胀高温合金中的分布及对件出相的影响.
钢铁,1997,32(6):56
|
被引
5
次
|
|
|
|
|
16.
孙文儒. Si对IN718合金凝固过程及元素偏析的影响.
航空材料学报,1996,16(2):7
|
被引
5
次
|
|
|
|
|
17.
曹国鑫. Nb含量对GH4169合金钢锭凝固及均匀化过程相演化规律的影响.
稀有金属材料与工程,2014,43:103
|
被引
9
次
|
|
|
|
|
18.
Sun W R. The common strengthening effect of phosphorus, sulfur, and silicon in lower contents and a problem of a net superalloy.
Superalloys,2000:467
|
被引
1
次
|
|
|
|
|
19.
McLean M. Effects of trace elements on mechanical properties of superalloys.
Metals Technol,1984,11:454
|
被引
1
次
|
|
|
|
|
20.
Wang A C. Effect of P and Si(Mn) on the solidification segregation in an iron-based superalloy.
Scripta Metall. Mater,1994,31:1695
|
被引
10
次
|
|
|
|
|
了解气象卫星更多信息，请访问