Intragranular precipitation in alloy 718

被引：54

作者：

Miller, MK

Babu, SS

Burke, MG

机构：

[1] Oak Ridge Natl Lab, Div Met & Ceram, Microscopy & Microanalyt Sci Grp, Oak Ridge, TN 37831 USA

[2] Westinghouse Elect Corp, Pittsburgh, PA 15122 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 270卷 / 01期

关键词：

alloy; 718; precipitates; superalloys;

D O I：

10.1016/S0921-5093(99)00235-X

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A combined energy-compensated 3-dimensional atom probe and transmission electron microscope characterization has been performed to determine the nature of the intragranular precipitates that form in Alloy 718 after various stages of a multistage heat treatment. Primary gamma " precipitates were found to form after the 870 degrees C stage. The secondary precipitates formed at lower temperatures were not found to be uniform throughout their volume, but to be divided into two distinct regions enriched in either niobium, or in aluminum and titanium, that are characteristic of the gamma " and gamma' phases, respectively. The experimentally determined partitioning data of the solute elements between the gamma matrix and the gamma " and gamma' phases was found to agree with the trends in the thermodynamic predictions. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：14 / 18

页数：5