Effect of Deep Rolling at Elevated and Low Temperatures on the Isothermal Fatigue Behavior of AISI 304

Author:  I Nikitin, I Altenberger, B Scholtes
Source:  Conf Proc: ICSP-9 (pg 185-190)
Doc ID:  2005070
Year of Publication:  2005
ABSTRACT This paper proposes a new method of surface optimisation to enhance the fatigue behaviour of AISI 304 stainless steel at ambient and elevated temperatures. High temperature deep rolling is a combination of classical methods for surface enhancement namely mechanical and thermal treatments. Mechanical surface treatments have been investigated thoroughly and can significantly improve the fatigue behaviour of steels. For AISI 304 stainless steel, which is used among others in nuclear power plants, deep rolling enhances the fatigue behaviour at room temperature as well as at elevated temperatures over a wide temperature range. Annealing after mechanical treatments can also improve the fatigue behaviour of many steels and has been studied already. However the combination of these two factors namely thermal and mechanical tereatment is rarely investigated. For this purpose a classical and a novel surface treatment method are compared to each other in terms of their impact on fatigue behaviour. The treatments induce distinctly different near-surface microstructures with different mechanical and thermal stability. The aim of this paper is to clarify the role of the different near-surface microstructures on the fatigue behaviour of stainless steel AISI 304.

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