Influence of Withdrawal Rate on Tensile and Stress Rupture Properties of the Single Crystal Superalloy DD9

被引：2

作者：

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

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

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

机构：

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

来源：

HIGH PERFORMANCE STRUCTURE MATERIALS | 2013年 / 747-748卷

关键词：

DD9; Single crystal superalloy; Withdrawal Rate; Mechanical properties; SOLIDIFICATION;

D O I：

10.4028/www.scientific.net/MSF.747-748.625

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The third generation single crystal superalloy DD9 was processed with different withdrawal rates and the effect of withdrawal rate on the tensile and stress rupture properties of the alloy was investigated. The relation between the mechanical properties and microstructure of the alloy with different withdrawal rates was discussed. The results showed that the withdrawal rate had a little effect on the tensile properties at 25 degrees C of the alloy. The tensile strength at 980 degrees C and stress rupture life at 1120 degrees C/140MPa of DD9 alloy all increased with the increasing of withdrawal rate. The gamma' precipitates of specimen tensile at 25 degrees C had a little extension in the stress orientation. The extension of gamma' precipitates in the stress orientation at 980 degrees C was much more than that at 25 degrees C. The vertical gamma matrix at 980 degrees C became thinner and horizontal gamma matrix became thicker slightly. The gamma' precipitates of those had rafted in a direction transverse to the applied stress.

引用

页码：625 / 628

页数：4

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