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Title: Effects of Peening on Stress Corrosion Cracking in Carbon Steel
Author: D Kirk, P E Render
Source: Conf Proc: ICSP-7 (pg 167-176)
Publication year 1999
Document number: 1999027
Number of pages: 10
Abstract:
Stress corrosion cracking is an inherent problem commonly found in most carbon steels. This research compares the susceptibility of mild, heat-treatable and surface-treated
carbon steels to SCC and investigates the effect that shot peening has on retarding it. U-bend specimens of mild, case-hardened and heat-treated EN8 steels at known tensile
stresses were tested in dilute solutions of strong mineral acids. Calibrating the stress applied to the specimens was done using an instrumented strain bolt. This enabled
the tensile surface stress on the outer radius of the U-bend specimen to be measured and allowed accurate time-to-crack measurements to be made. Studies showed that
material conditions, in terms of hardness, microstructure and heat treatment, greatly affected the susceptibility to SCC. It was also found that shot peening substantially
reduced SCC susceptibility. Using U-bend specimens of martensitic, EN8 steel, immersed in 30% sulphuric acid and heated to 67°C, cracking at high stresses (approximately
90% of the material's elastic limit) occurred after hours, when peened, as opposed to minutes for the unpeened specimens.
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