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Title: Static and Dynamic Strain Ageing of Deep Rolled Plain Carbon Steel SAE 1045 for Optimized Fatigue Strength
Author: Altenberger, Nikitin, Scholtes
Source: Conf Proc: ICSP-9 (pg 253-260)
Publication year 2005
Document number: 2005094
Number of pages: 8
Abstract:
Combined mechanical and thermal surface treatments offer a great potential for fatigue life enhancement. In literature, shot peening at elevated temperature ("warm peening")
is already established. In this study, we investigate the effect of high temperature deep rolling as well as of consecutive deep rolling and annealing on the fatigue
behaviour and residual stress state of normalized plain carbon steel SAE 1045. For this purpose hysteresis measurements are performed. The results indicate that deep rolling
at elevated temperatures may significantly enhance fatigue life and strength. Maximum fatigue lives and smallest plastic strain amplitudes in fully reversed push-pull
cycling occurs at rolling temperatures of 350° C where dynamic strain ageing is prevalent. Exemplary residual stress measurements show that thermomechanically treated
(either high temperature deep rolled or deep rolled plus annealed) samples exhibit more stable residual macro and microstresses during fatigue loading.
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