Effect of minor elements on the grain boundary strengthening of a single crystal superalloy RR2072

被引：1
|
作者：
Kim, D. H. [1 ]
Yoo, Y. S. [1 ]
Jo, C. Y. [1 ]
Jones, C. N. [2 ]
机构：
[1] Korea Inst Machinery & Mat, High Temp Mat Lab, 66 Sangnam Dong, Chang Won 641010, South Korea
[2] Rolls Royce Plc, Derby DE24 8BJ, England
来源：
ADVANCES IN NANOMATERIALS AND PROCESSING, PTS 1 AND 2 | 2007年 / 124-126卷
关键词：
Ni base superalloy; single crystal; grain boundary strengthening; carbon; boron;
D O I：
10.4028/www.scientific.net/SSP.124-126.1405
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effect of carbon and boron on the grain boundary strengthening of a second generation single crystal superalloy RR2072 was investigated. Single crystal and bicrystal specimen with three kinds of tilt type misorientation angle were grown by Bridgman technique. Creep and stress rupture tests were conducted at 950 degrees C and 1050 degrees C. Rupture life of single crystal of the alloy modified with carbon and boron was comparable to that of the KR2072 which is free from boron and carbon. TCP phase precipitation such as sigma was suppressed in the modified alloy during thermal exposure and creep deformation. Rupture life of the modified alloy bicrystal was superior to that of the RR2072 bicrystal. M23C6 carbide formation and suppression of gamma' band growth is thought to be the role of minor elements for the grain boundary strengthening of a nickel base single crystal superalloy RR2072.
引用
收藏
页码：1405 / +
页数：2
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