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Title: Influence Of Ball-burnishing On Stress Corrosion Cracking, Fatigue And Corrosion Fatigue Of Ai 2024 And Ai 6082
Author: M. Mhaede, M. Wollmann and L. Wagner
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008118
Number of pages: 6
Abstract:
ABSTRACT
Ball-burnishing (BB) was done on the age-hardenable alloys Al 2024 and Al 6082. The main process parameter rolling force was varied to a wide extent. The processinduced
changes in near-surface properties were determined by microhardnessdepth profiles and residual stress-depth profiles measured by the incremental hole drilling method. The
influences of these surface layer properties on stress corrosion cracking (SCC) and corrosion fatigue (CF) in aqueous 3.5% NaCl solutions were studied. Results were compared
with electrolytically polished references.
Stress corrosion cracking (SCC) tests were performed on standard tensile specimens under stress control using stress levels ranging from 60 to 100% of the yield stress. The
time to failure was recorded. Corrosion fatigue (CF) tests were performed on hour-glass shaped specimens in rotating beam loading (R = -1) at frequencies of 50 s-1. Results
of these corrosion fatigue (CF) tests were compared with results obtained
in fatigue tests in air. It was found that the time to failure (TTF) in the SCC tests as well as the fatigue life in the CF tests were markedly improved by ball-burnishing.
KEY WORDS Ball-burnishing, stress corrosion, fatigue, corrosion fatigue
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This page last revised: 03/22/2010