Effect of Platform Dimension on the Dendrite Growth and Stray Grain Formation in a Ni-Base Single-Crystal Superalloy

被引：62

作者：

Meng, X. B. ^{[1
]}

Li, J. G. ^{[1
]}

Chen, Z. Q. ^{[2
]}

Wang, Y. H. ^{[2
]}

Zhu, S. Z. ^{[2
]}

Bai, X. F. ^{[2
]}

Wang, F. ^{[3
]}

Zhang, J. ^{[4
]}

Jin, T. ^{[1
]}

Sun, X. F. ^{[1
]}

Hu, Z. Q. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] Aviat Ind Corp China AVIC Shenyang Liming Aeroeng, Shenyang 110043, Peoples R China

[3] Aviat Ind Corp China AVIC Guiyang Liyang Aeroengi, Guiyang 550002, Peoples R China

[4] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2013年 / 44A卷 / 04期

基金：

中国国家自然科学基金;

关键词：

LOW-ANGLE BOUNDARIES; DIRECTIONAL SOLIDIFICATION; FRECKLE FORMATION; SPIRAL SELECTOR; TURBINE-BLADES; SIMULATION; CASTINGS; PREDICTION; MECHANISM;

D O I：

10.1007/s11661-012-1527-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model of typical turbine blade shape with different platforms was designed to study the nucleation and growth of stray grains in the platforms by both experimental investigation and a ProCAST simulation based on a cellular automaton finite-element model. The results show that at the withdrawal rate of 5 mm/min, no stray grains nucleate in the small dimensional platform. However, the primary grain grows into the inner and outer sections of this platform in different manners due to different thermal conditions in these sections. Furthermore, with the increase of platform dimension, stray grains with random orientations gradually nucleate in the corners of the platforms. It is found that these stray grains tend to nucleate either in the inner corners or at a faster withdrawal rate, which is associated with the corresponding thermal condition. Based on these results, the rule of the critical platform dimension and withdrawal rate without stray grain formation has been proposed. Besides, the simulation results are in accordance with experimental findings.

引用

页码：1955 / 1965

页数：11

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