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Title: Thermal Relaxation Of Residual Stresses Induced By Shot Peening In In718
Author: J. Hoffmeister, V. Schulze, A. Wanner, R. Hessert,
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008060
Number of pages: 6
Abstract:
ABSTRACT
Shot peening is often used to improve the fatigue life of turbine components applied at elevated temperatures. Therefore it is very important to know the thermal relaxation
of residual stresses.
The objective of this work was to analytically describe thermal relaxation of residual stresses in the Ni-based superalloy IN718 induced by shot peening. Shot peened
specimens were aged in a temperature range up to 750°C for aging times between 0.1 and 100 hours. The time dependent changes in the residual stress distribution were
determined experimentally using X-ray diffraction. It was observed that the position of the residual stress maximum and the zero crossing remains essentially constant during
aging. The evolutions of the surface residual stresses and the maximum residual stresses observed in the depth profile could be successfully
described on base of a modified Zener-Wert-Avrami-equation.
Assuming constant depth positions of zero crossing and maximum residual stress, the depth distributions of stress-relaxation can be completely described by a single
mathematical function. As a result, two sets of parameters for the surface and maximum residual stresses can be extracted.
Keywords: material modeling, IN718, strain ageing, residual stresses, thermal relaxation
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This page last revised: 03/22/2010