Influence of elevated Co and Ti levels on polycrystalline powder processed Ni-base superalloy

被引：34

作者：

Jones, N. G. ^{[1
]}

Christofidou, K. A. ^{[1
]}

Mignanelli, P. M. ^{[1
]}

Minshull, J. P. ^{[1
]}

Hardy, M. C. ^{[2
]}

Stone, H. J. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England

[2] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2014年 / 30卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

Nickel-base superalloy; Cobalt; Titanium; Mechanical properties; RESOLVED SHEAR-STRESS; PHASE CONSTITUENTS; UDIMET; 720LI; YIELD-STRESS; PRECIPITATION; STRENGTH; MICROSTRUCTURE; BEHAVIOR; TENSILE; COBALT;

D O I：

10.1179/1743284714Y.0000000509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influences of elevated Co and Ti levels on the mechanical properties of the Ni-base superalloy RR1000 have been investigated. Following heat treatment, the modified alloys had the typical gamma-gamma' microstructure, with gamma' precipitate sizes comparable to similarly heat treated RR1000, but with a slightly higher volume fraction. The modified alloys exhibited a higher proof stress than RR1000 across the entire 20 to 800 degrees C temperature range investigated. Superior creep rupture lives, when compared to RR1000, were observed in the modified alloys at 700 degrees C, but not at 750 degrees C, where extensive precipitation of topologically close packed sigma phase occurred on the grain surfaces. The formation of this deleterious phase was linked to Cr and Mo enrichment of the c matrix, caused by the elevated Co and Ti additions.

引用

页码：1853 / 1861

页数：9

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