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首页> 外文期刊>Journal of Korean Institute of Metal and Materials >The effect of solidification rate on MC carbide trapping behavior during directional solidification of the superalloy Mar-M247LC
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The effect of solidification rate on MC carbide trapping behavior during directional solidification of the superalloy Mar-M247LC

机译：凝固速率对超级合金Mar-M247LC定向凝固过程中MC碳化物捕集行为的影响

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摘要

MC carbide trapping in Mar-M 247LC alloy wassystemically investigated by directional solidification andquenching method. It was found that several kinds of differentlyshaped carbides formed according to the distance from the dendritetip and solidification rates. The trapping behaviors betweenrelatively higher solidification rate and slower solidification ratewere different. The calculated maximum carbide nuclei size wasclose to the observed value when the sample solidification ratewas slow, but it was smaller than the observed value when thesample solidification rate was high. The inter-secondary dendritearm region was the preferred trapping site. At very slowsolidification rate, the bottom of the mushy zone was also atrapping site while at high solidification rate the dendrite side wallbecame a trapping site. Reduction of carbide volume fraction atthe slow sample solidification rate was caused by the low trappingability of the solid-liquid interface and lack of suitablesolidification site in the solid-liquid interface at the slowsolidification rate. At relatively higher solidification rate, thesolid-liquid interface trapped the carbide nuclei in front of themoving interface. In contrast, some difficulty to trap the carbidenuclei occurred at the slower solidification rate.
机译：通过定向凝固和淬火方法对Mar-M 247LC合金中MC碳化物的俘获进行了系统研究。已发现，根据距枝晶尖端的距离和凝固速率，形成了几种不同形状的碳化物。相对较高的凝固速率和较慢的凝固速率之间的俘获行为是不同的。当样品凝固速度慢时，计算出的最大碳化物核尺寸接近于观测值，但是当样品凝固速度高时，计算出的最大碳化物核尺寸小于观测值。次生树突枝区域是首选的诱捕位点。在非常慢的凝固速率下，糊状区的底部也是捕获点，而在高凝固速率下，枝晶侧壁成为捕获点。慢速样品凝固速率下碳化物体积分数的降低是由于固液界面的捕集能力低以及在慢速凝固速率下固液界面上缺乏合适的凝固位点所致。在相对较高的凝固速率下，固液界面将碳化物核捕获在运动界面的前面。相反，在较低的凝固速率下会出现一些难以捕获碳化物核的困难。

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