Kinetic Analysis for High-Temperature Coarsening of γ" Phase in Ni-Based Superalloy GH4169

被引：22

作者：

Zhang, Cheng ^{[1
]}

Yu, Liming ^{[2
]}

Wang, Hui ^{[3
]}

机构：

[1] North China Inst Aerosp Engn, Sch Mat & Engn, Langfang 065000, Peoples R China

[2] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300354, Peoples R China

[3] Nucl Power Inst China, Sci & Technol Reactor Fuel & Mat Lab, Chengdu 610041, Sichuan, Peoples R China

来源：

MATERIALS | 2019年 / 12卷 / 13期

基金：

中国国家自然科学基金;

关键词：

gamma '' phase; GH4169; aging; coarsening kinetics; Ni-based superalloy; INCONEL; 718; ALLOY; 650; DEGREES-C; DELTA-PHASE; MICROSTRUCTURE EVOLUTION; HOT DEFORMATION; PRECIPITATION; BEHAVIOR; MECHANISMS;

D O I：

10.3390/ma12132096

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 growth of precipitates in Ni-based superalloy GH4169 is critical as it controls the mechanical properties and long-term stability of the alloy. In this paper, the coarsening behavior of the main strengthening phase gamma '' in the temperature range from 800 degrees C to 900 degrees C is investigated. Two heat treatment steps, i.e., pre-precipitation of gamma '' phase and coarsening of precipitates at high temperatures, were performed on the GH4169 alloy. It was found that there were three morphological forms of gamma '' phase in chronological order: lip-shape, disc-shape, and irregular rectangle-shape with larger size. The coarsening kinetics of gamma '' phase followed the Lifshitz-Slyozov-Wagner (LSW) time-law for diffusion-controlled growth, and the activation energies of gamma '' phase before and after losing the coherent relationship with matrix were 261 kJ mol(-1) and 271 kJ mol(-1), respectively.

引用

页数：12

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