A physically based model for correlating the microstructural degradation and residual creep lifetime of a polycrystalline Ni-based superalloy

被引：16

作者：

Li, Shaolin ^{[1
,2
]}

Wang, Bingxue ^{[1
]}

Shi, Duoqi ^{[1
,2
]}

Yang, Xiaoguang ^{[1
,2
]}

Qi, Hongyu ^{[1
,2
]}

机构：

[1] Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China

[2] Beijing Key Lab Aeroengine Struct & Strength, Beijing 100191, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 783卷

基金：

中国国家自然科学基金;

关键词：

Microstructure evolution; Lifetime degradation; K417; alloy; Creep-rupture time; Analytical model; SERVICE INDUCED DEGRADATION; TURBINE BLADE; MECHANICAL-PROPERTIES; FAILURE ANALYSIS; EVOLUTION; PRECIPITATION; K417; PROPERTY; EXPOSURE; BEHAVIOR;

D O I：

10.1016/j.jallcom.2018.11.417

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 microstructure evolution and creep property degradation of the Ni-based superalloy K417 were studied at different high-temperature thermal exposure conditions. The results showed that the equivalent radius of gamma' precipitates increased with the exposure time at all the temperatures and displayed spherical morphologies. Moreover, small blocky-type Cr-rich M23C6 carbides were observed due to the decomposition of the primary MC after exposure to 950 degrees C for 200 h and 50 h both at 1000 degrees C and 1050 degrees C. The creep-rupture lifetimes deteriorated with increased exposure time and temperature due to gamma' precipitates coarsening and the decomposition of the primary carbides. Furthermore, a physically based analytical model was developed to describe the influence of the microstructural evolution of the gamma' precipitates on the residual creep lifetime. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：565 / 573

页数：9

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