镍基单晶高温合金薄壁试样的一次枝晶间距统计方法对比  

Comparison of Statistical Methods for Primary Dendrite Spacing of Thin-wall Ni-based Single Crystal Superalloy Specimens

作　　者：姜祖岗 叶新玥 张剑 郭媛媛 张迈 李远 卢广先 胡松松 Jiang Zugang;Ye Xinyue;Zhang Jian;Guo Yuanyuan;Zhang Mai;Li Yuan;Lu Guangxian;Hu Songsong(Air China Commercial Aero Engine Co.,Ltd.;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials;School of Materials Science and Engineering,Xiangtan University)

机构地区：[1]中国航发商用航空发动机有限责任公司 [2]北京航空材料研究院先进高温结构材料重点实验室 [3]湘潭大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2023年第5期655-659,共5页Special Casting & Nonferrous Alloys

基　　金：湖南省自然科学基金项目资助(2022JJ40439);湖南省科技创新计划资助项目(2021RC2088)。

摘　　要：分别采用面积测量法、三角形测量法和最小生成树法,对不同壁厚的镍基单晶高温合金试样的一次枝晶间距进行了统计。结果表明,面积测量法和三角形测量法对块状试样平均一次枝晶间距的统计结果基本相当,大于采用最小生成树法获得的数值。随试样壁厚降低,三角形测量法和最小生成树法统计的平均一次枝晶间距差距基本固定,一次枝晶间距的容许范围随着试样壁厚降低而缩小,而面积测量法在统计薄壁试样的平均一次枝晶枝晶间距时显示出明显的不稳定性。最后,讨论了3种方法统计镍基单晶高温合金薄壁试样一次枝晶间距时的特点和适用性。The primary dendrite spacing of Ni-based single crystal superalloy specimens with different wall thickness was calculated by area measurement method,triangle measurement method and minimum spanning tree method,respectively.The results indicate that the statistics results of area measurement method and the triangle measurement method are basically similar,which are both larger than that of minimum spanning tree method.With the decrease of thickness,the deviation of primary dendrite spacing between triangle measurement method and minimum spanning tree method is basically fixed with decreasing in allowable range,while the statistical results of the area measurement method display obvious instable.Finally,the characteristics and applicability of each method on primary dendrite spacing of thin wall specimens were discussed.

关 键 词：镍基高温合金 薄壁件 一次枝晶间距 最小生成树 

分 类 号：TG113.1[金属学及工艺—物理冶金]