Abstract
Uni-directional torsion fatigue tests were carried out on heat-treated En 36A (nickel-chromium) alloy steel which had been given various surface treatments. Recarburization raised fatigue strength relative to the scaled and decarburized condition by 160 per cent. Pre-strained, polished or shot-peened surfaces produced increases in strength ranging from 16 to 60 per cent. The effects of hardening and residual stress are discussed.
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