Hot Deformation Behavior of a Ni-Fe-Cr Based Superalloy for Advanced Ultra-supercritical Coal-fired Power Plants Application

被引：0

作者：

Han L. ^{[1
]}

Wu Y. ^{[2
,3
]}

Liu Z. ^{[2
]}

Qin X. ^{[2
]}

Wang C. ^{[2
]}

Zhou L. ^{[2
]}

Yu H. ^{[1
]}

Chen Y. ^{[4
]}

机构：

[1] China Institute of Atomic Energy, Beijing

[2] Institute of Metal Research, Chinese Academy of Sciences, Shenyang

[3] School of Materials Science and Engineering, University of Science and Technology of China, Hefei

[4] Department of Customer Development, Minmetals Development Co., LTD., Beijing

来源：

Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 03期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Advanced ultra-supercritical (A-USC); Dynamic recrystallization; Hot deformation; Ni-Fe-Cr based alloy;

D O I：

10.11896/cldb.19030145

中图分类号：

学科分类号：

摘要：

The deformation behavior of a Ni-Fe-Cr based superalloy for 700℃ advanced ultra-supercritical (A-USC) power plant application was studied by the isothermal compression test at temperature range of 900-1 200℃ with strain rates of 0.01-10 s-1 on a Gleeble-1500 thermo-mechanical simulator. The results showed that the flow stress increased with the decreasing temperature and the increasing strain rate. The fraction of dynamic recrystallization decreased with the decreasing temperature and the increasing strain rate. However, when the strain rate was higher than 1 s-1, the fraction of dynamic recrystallization rose with the increasing strain rate due to the effect of adiabatic heating. The reasonable deformation temperature range of the alloy was 1 100-1 200℃, and the strain rate range was 0.01-0.3 s-1. The nucleation mechanism of dynamic recrystallization in the alloy was discontinuous dynamic recrystallization due to the existence of original grain boundaries bulging at high temperature and low strain rate. However, the dominant nucleation mechanism of dynamic recrystallization at low temperature and high strain rate turned into continuous dynamic recrystallization featured by sub-grains development within the original grains. © 2020, Materials Review Magazine. All right reserved.

引用

页码：06109 / 06113

页数：4

共 23 条

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