STUDY OF SOLIDIFICATION FEATURES OF NICKEL-BASE SUPERALLOYS IN RELATION WITH COMPOSITION

被引：30

作者：

LECOMTEBECKERS, J

机构：

[1] Univ of Liege, Belgium

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1988年 / 19卷 / 09期

关键词：

Differential Thermal Analysis - Heat Treatment--Quenching - Nickel Metallography--Microstructures - Superalloys--Additives;

D O I：

10.1007/BF02645057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of the six major alloying elements: carbon, chromium, cobalt, molybdenum titanium, and aluminum on the solidification sequence of nickel-base superalloys was investigated. The microstructure was found to depend greatly on aluminum and titanium contents. During solidification the liquid is enriched in titanium and molybdenum, wheras the dendrite cores are richer in cobalt. Aluminum and chromium segregate in the liquid or in the dendrite center, depending on alloy nominal composition. Chemical analysis of the carbides showed that their composition changes during solidification, thus affecting the composition of the residual liquid. The composition of carbides is strongly influenced by titanium and molybdenum nominal content in the alloy. Statistical analysis of the transformation temperatures obtained by DTA showed that titanium and aluminum influence the entire solidification sequence.

引用

页码：2333 / 2340

页数：8