Formation Mechanism of Low Angle Boundary of DD6 Single Crystal Superalloy Blades

被引：2

作者：

Shi, Z. X. ^{[1
]}

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

Liu, S. Z. ^{[1
]}

Zhao, J. Q. ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Sci & Technol Adv High Temp Struct Mat Lab, Beijing 100095, Peoples R China

来源：

ADVANCED ENGINEERING MATERIALS II, PTS 1-3 | 2012年 / 535-537卷

关键词：

DD6; single crystal superalloy; low angle boundary; blade; SOLIDIFICATION;

D O I：

10.4028/www.scientific.net/AMR.535-537.1019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The specimens were machined from DD6 single crystal superalloy blades with low angle boundary. The misorientation of LAB was measured with EBSD technique in scanning electron microscope. The microstructures of specimens with LAB were examined in optical microscope and scanning electron microscope. The formation mechanism of low angle boundary of DD6 single crystal superalloy blades was investigated. The results showed that he formation of LAB which is caused by the deviating orientation from ideal [001] and the angle between the crystal orientation and shell is crystal selection process acted by dendrite competitive growth rule. Part of dendrites have changed their growth orientation a little to the decreasing [001] orientation departure angle because of solidification condition fluctuating during dendrites branching process. The LAB is the obvious interface between the deforming dendrites and their surrounding dendrites.

引用

页码：1019 / 1022

页数：4