Effect of aging temperature on the secondary γ′ precipitation in a model Ni based single crystal superalloy

被引：36

作者：

He, Chuang ^{[1
]}

Liu, Lin ^{[1
]}

Huang, Taiwen ^{[1
]}

Yang, Wenchao ^{[1
]}

Zhang, Jun ^{[1
]}

Guo, Min ^{[1
]}

Fu, Hengzhi ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 836卷

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

Nickel based single crystal superalloys; Secondary gamma ' precipitation; Aging temperature; Matrix channel width; Diffusion distance; MECHANICAL-PROPERTIES; HEAT-TREATMENT; COOLING RATE; NICKEL; MICROSTRUCTURE; INTERDIFFUSION; KINETICS; GENERATIONS; STRENGTH; SYSTEMS;

D O I：

10.1016/j.jallcom.2020.155486

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of aging temperature variations ranging from 1120 to 1180 degrees C on secondary gamma' precipitation in a nickel based single crystal superalloy was investigated. The secondary gamma' precipitates in y matrix channel were documented only in the sample aging treated at 1180 degrees C for 4 h, but was not found in the sample aging treated at 1160 degrees C and below. It was found that the supersaturation of gamma' forming elements in the channel was mainly affected by gamma' fraction. Arise from the decreasing of vertical bar d f gamma'/dT vertical bar by aging temperature falling, the precipitation of secondary gamma' in the channel was blocked and eliminated completely. Though the narrowing of the channel width had helpful to increase the efficiency of atoms migration, which cannot offset the influence of diffusivity decreasing that result from aging temperature reduction. A simple model was proposed in the end to illustrate the different mechanisms of aging temperature and cooling rate. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：8

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