Evolution of flow stress and microstructure during isothermal compression of Waspaloy

被引：51

作者：

Chamanfar, A. ^{[1
,2
]}

Jahazi, M. ^{[2
]}

Gholipour, J. ^{[3
]}

Wanjara, P. ^{[3
]}

Yue, S. ^{[1
]}

机构：

[1] McGill Univ, Dept Mat Engn, Montreal, PQ H3A 0C5, Canada

[2] Ecole Technol Super, Dept Genie Mecan, Montreal, PQ H3C 1K3, Canada

[3] Natl Res Council Canada, Aerosp, Montreal, PQ H3T 2B2, Canada

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 615卷

关键词：

Waspaloy; Isothermal hot compression; Friction; Adiabatic heating; Flow stress; Microstructure; HOT-WORKING; DEFORMATION CHARACTERISTICS; GRAIN-GROWTH; BEHAVIOR; RECRYSTALLIZATION; SUPERALLOY; SIMULATION; LIQUATION; FRICTION; VOLUME;

D O I：

10.1016/j.msea.2014.07.093

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The evolution of the flow stress and microstructure for Waspaloy was studied in the 950-1140 degrees C temperature range under constant true strain rate conditions of 0.001-1 s(-1) up to a true strain of 0.83 using isothermal hot compression testing. The impact of friction at the sample/anvil interface and adiabatic heating during deformation on the flow stress evolution was also examined. Mathematical models relating the flow stress to the deformation temperature and strain rate were derived using a power-law relationship. The strain rate sensitivity and the activation energy for hot deformation of Waspaloy were found to be considerably different for deformation in the subsolvus and supersolvus temperature ranges. According to the microstructural investigations, at 950 degrees C dynamic recovery (DRV) was the main softening mechanism. By contrast, dynamic recrystallization (DRX), partial or complete, occurred at temperatures above 950 degrees C and resulted in flow softening. (C) 2014 Crown Copyright and Elsevier B.V. All rights reserved.

引用

页码：497 / 510

页数：14

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