Alternative TitleEffect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169
李小亮1; 陈波1; 邢炜伟1; 丁磊磊1; 马颖澈1; 刘奎1
Source Publication材料研究学报
Abstract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。
Other AbstractThe 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.
Keyword金属材料 K4169合金 等温凝固 元素偏析 Laves相
Indexed ByCSCD
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Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
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GB/T 7714
李小亮,陈波,邢炜伟,等. 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,2018,32.0(012):936-944.
APA 李小亮,陈波,邢炜伟,丁磊磊,马颖澈,&刘奎.(2018).Si对铸造高温合金K4169的凝固行为和力学性能的影响.材料研究学报,32.0(012),936-944.
MLA 李小亮,et al."Si对铸造高温合金K4169的凝固行为和力学性能的影响".材料研究学报 32.0.012(2018):936-944.
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