Microstructural investigation of oxide dispersion strengthened alloy 617 after creep rupture at high temperature

被引：16

作者：

Wang, Man ^{[1
,2
]}

Han, Heung Nam ^{[2
]}

Han, Chang Hee ^{[1
]}

Kim, Woo-Gon ^{[1
]}

Jang, Jinsung ^{[1
]}

机构：

[1] Korea Atom Energy Res Inst, Adv Mat Dev Team, Daejeon 34057, South Korea

[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

来源：

MATERIALS CHARACTERIZATION | 2018年 / 139卷

基金：

新加坡国家研究基金会;

关键词：

ODS; 617; alloy; Creep; Microstructure; Y-AI-O particles; Carbide; NICKEL-BASE ALLOYS; TENSILE PROPERTIES; PRECIPITATION; SUPERALLOY; BEHAVIOR; GAMMA; STRESS; STEEL; DEFORMATION; CHALLENGES;

D O I：

10.1016/j.matchar.2018.02.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxide dispersion strengthened (ODS) alloys have been widely considered as candidate structural materials for advanced nuclear reactors because of their good high temperature properties and irradiation resistance. In this study, the creep properties of oxide dispersion strengthened Alloy 617 (ODS-617) was examined at 950 degrees C under 25 MPa in the air. Conventional Alloy 617 tested under the same conditions was included for comparison. The ODS-617 exhibited superior creep resistance, including a much longer rupture life of 8533 h and a steady-state creep rate of 8.9 x 10(-8) (1/s), which was two orders of magnitude lower than that of the conventional alloy. The lower steady-state creep rate was related to the dispersion of nano-sized Y-Al-O particles, which may impede grain boundary diffusion. It seems that cracks preferentially developed near some large rod-like AN particles, resulting in the brittle creep fracture mode.

引用

页码：11 / 18

页数：8

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