Analysis of shot-peening and residual stress relaxation in the nickel-based superalloy RR1000

被引：155

作者：

Foss, B. J. ^{[1
]}

Gray, S. ^{[2
]}

Hardy, M. C. ^{[3
]}

Stekovic, S. ^{[3
]}

McPhail, D. S. ^{[1
]}

Shollock, B. A. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[2] Cranfield Univ, Sch Appl Sci, Cranfield MK43 0AL, Beds, England

[3] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 07期

关键词：

Shot-peening; Dwell-fatigue; Residual stress; Recrystallization; PEENED UDIMET 720LI; HIGH-TEMPERATURE; PLASTIC STRAIN; CREEP; DAMAGE; ALLOY; RECRYSTALLIZATION; FATIGUE; STEEL;

D O I：

10.1016/j.actamat.2013.01.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work assesses the residual stress relaxation of the nickel-based alloy RR1000 due to thermal exposure and dwell-fatigue loading. A number of different characterization methods, including X-ray residual stress analysis, electron back-scattered diffraction, microhardness testing and focused ion beam secondary electron imaging, contributed to a detailed study of the shot-peened region. Thermal exposure at 700 degrees C resulted in a large reduction in the residual stresses and work-hardening effects in the alloy, but the subsurface remained in a beneficial compressive state. Oxidizing environments caused recrystallization in the near surface, but did not affect the residual stress-relaxation behaviour. Dwell-fatigue loading caused the residual stresses to return to approximately zero at nearly all depths. This work forms part of an ongoing investigation to determine the effects of shot-peening in this alloy with the motivation to improve the fatigue and oxidation resistance at 700 degrees C. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2548 / 2559

页数：12

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