Si对铸造高温合金K4169的凝固行为和力学性能的影响

doi:10.11901/1005.3093.2018.181

材料研究学报

2018, Vol. 32

Issue (12): 936-945 DOI: 10.11901/1005.3093.2018.181

研究论文

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Si对铸造高温合金K4169的凝固行为和力学性能的影响

李小亮^1,², 陈波¹(

), 邢炜伟¹, 丁磊磊¹, 马颖澈¹, 刘奎¹

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

Effect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169

Xiaoliang LI^1,², Bo CHEN¹(

), Weiwei XING¹, Leilei DING¹, Yingche MA¹, Kui LIU¹

1 ^.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

李小亮, 陈波, 邢炜伟, 丁磊磊, 马颖澈, 刘奎. Si对铸造高温合金K4169的凝固行为和力学性能的影响[J]. 材料研究学报, 2018, 32(12): 936-945.
Xiaoliang LI, Bo CHEN, Weiwei XING, Leilei DING, Yingche MA, Kui LIU. Effect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169[J]. Chinese Journal of Materials Research, 2018, 32(12): 936-945.

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摘要:

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。

关键词 ：金属材料, K4169合金, 等温凝固, 元素偏析, Laves相

Abstract：

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.

Key words： metallic materials K4169 alloy isothermal solidification elemental segregation Laves phase

收稿日期: 2018-03-08

作者简介:

作者简介李小亮,男,1991年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.181 或 https://www.cjmr.org/CN/Y2018/V32/I12/936

表1 K4169母合金的化学成分

图1 Thermo-Calc平衡态计算结果

图2 不同Si含量的合金在等温温度为1350℃、1340℃、1290℃和1240℃的凝固样品的金相照片

图3 不同Si含量的合金等温凝固样品的等温温度与剩余液相体积分数的关系

表2 不同Si含量的K4169合金等温凝固试验和模拟获得的固液相线温度和主要相析出温度

表3 不同Si含量样品在1240℃等温温度下的合金元素的偏析系数

图4 0.03Si在1280℃等温凝固下残余液相在淬火中析出的共晶状Laves相形态

图5 0.03Si和0.23Si合金在1120℃等温时析出的网状Laves、0.42Si合金在1180℃等温时析出的块状Laves相以及0.65Si合金在1190℃等温时析出的块状Laves相

图6 不同Si含量合金在不同温度下Laves相和MC数量的变化

图7 不同Si含量的铸态组织

图8 不同Si含量样品的室温拉伸性能和在650℃/620 MPa下的持久性能

图9 不同Si含量试样的室温拉伸断口全貌图

图10 不同Si含量样品的室温拉伸断口纵剖面形貌

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