单晶高温合金螺旋选晶过程的数值模拟与实验研究:I.引晶段

doi:10.1016/j.jmst.2013.07.001

金属学报

2013, Vol. 49

Issue (12): 1508-1520 DOI: 10.1016/j.jmst.2013.07.001

论文

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单晶高温合金螺旋选晶过程的数值模拟与实验研究:I.引晶段

张航¹⁾,许庆彦¹⁾,孙长波²⁾, 戚翔^1),唐宁¹⁾,柳百成¹⁾

1) 清华大学材料学院先进成形制造教育部重点实验室, 北京 100084
2) 沈阳黎明航空发动机(集团)有限责任公司, 沈阳 110043

SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY ：I. Starter Block

ZHANG Hang¹⁾, XU Qingyan¹⁾, SUN Changbo²⁾, QI Xiang¹⁾,TANG Ning¹⁾, LIU Baicheng ¹⁾

1) Key Laboratory for Advanced Materials Processing Technology, Ministry of Education,School of Materials Science and Engineering, Tsinghua University, Beijing 100084

2) Shenyang Liming Aero—Engine Group Corporation Ltd., Shenyang 110043

引用本文:

张航,许庆彦,孙长波, 戚翔,唐宁,柳百成. 单晶高温合金螺旋选晶过程的数值模拟与实验研究:I.引晶段[J]. 金属学报, 2013, 49(12): 1508-1520.
ZHANG Hang, XU Qingyan, SUN Changbo, QI Xiang, TANG Ning, LIU Baicheng. SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY ：I. Starter Block[J]. Acta Metall Sin, 2013, 49(12): 1508-1520.

全文: PDF(7938 KB)

摘要:

从实验及模拟角度对比研究了引晶段的晶粒密度和取向随晶粒生长高度(研究位置距试样底面的高度)的变化规律,并给出了引晶段参数的设计准则. 采用EBSD晶体取向成像技术获得了引晶段截面的晶粒形貌和取向极图;采用CA—FD方法, 针对单晶定向凝固过程进行数理建模与仿真,实现了凝固过程的三维宏观温度场与微观组织生长的模拟计算.从宏、微观角度解释了定向凝固过程的晶粒竞争演化行为, 为引晶段设计提供理论支持.

关键词 ：螺旋选晶器, 引晶段, 数值模拟, 晶粒取向, 晶粒密度

Abstract：

The rapid development of advanced aero—engine and industry gas turbine requires high performance of single crystal (SX) blade. Spiral selector is very important to produce SX blade, which includes starter block and spiral part. In this research, grain density changing and orientation deviating as the height of grain growth (the distance between section studied and the undersurface of the sample) increasing were studied by the experiment and simulation, and the designing rules for the starter block were given out. EBSD orientation mapping technology was used to get grains' morphology and orientation. Mathematical and physical models were built for the directional solidification process. Adopting CA—FD method, the 3D macro temperature field of solidification process was calculated as well as grain growth. The properties of grains competitive growth and evolution process during directional solidification in starter block were analyzed based on macro and micro modeling results, and rules for grains competitive growth was explained, which provided theoretical supports for designing starter block.

Key words： spiral grain selector starter block numerical simulation grain orientation grain density

收稿日期: 2013-04-25

基金资助:

国家重点基础研究发展计划项目2011CB706801, 国家自然科学基金项目51171089,以及国家科技重大专项项目2011ZX04014—052

作者简介: 张航, 男, 1985年生, 博士生

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