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

ZHANG Hang; XU Qingyan; SUN Changbo; QI Xiang; TANG Ning; LIU Baicheng

doi:10.1016/j.jmst.2013.07.001

Acta Metall Sin >

2013 , Vol. 49 >Issue 12: 1508 - 1520

DOI: https://doi.org/10.1016/j.jmst.2013.07.001

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

ZHANG Hang ,
XU Qingyan ,
SUN Changbo ,
QI Xiang ,
TANG Ning ,
LIU Baicheng

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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

Received date: 2013-04-25

Revised date: 2013-08-02

Online published: 2013-12-11

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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

Cite this article

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 . DOI: 10.1016/j.jmst.2013.07.001

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