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Title: Residual Stresses Induced by Peening Austenitic Ductile Cast-Iron
Author: D Kirk, D G Birch
Source: Conf Proc: ICSP-7 (pg 23-32)
Publication year 1999
Document number: 1999012
Number of pages: 10
Abstract:
Beneficial compressive surface residual stresses have been induced by peening an austenitic ductile cast iron (20%Ni, 2%Cr, 0.15%Nb weldable-grade). Stress levels of
-433MPa and -280MPA were found for shot-peened and needle-peened conditions respectively. Surface compressive residual stresses of that magnitude will impart substantial
improvements to the service performance of castings. Stress measurements were made using a standard two-exposure X-ray diffractometer technique. Young's modulus and
Poisson's ratio measurements, needed to convert measured strains into stresses, were made using tensile-loaded strain-gauged specimens. Isochronal annealing experiments
showed that a large proportion of the induced compressive residual stress could be retained up to 450°C. It has been concluded that substantial practical benefits can be
gained by peening austenitic ductile irons. Needle peening has particular appeal since it could be used for selective peening of large castings in situ.
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