Fatigue Properties of Steels SAE 1045 and SAE 4140 upon Integrated Inductive Heat Treatment and Deep Rolling at Elevated Temperature

Author:  Torben Oevermann, Stephanie Saalfeld, Thomas Niendorf, Berthold Scholtes
Source:  ICSP-13
Doc ID:  2017111
Year of Publication:  2017
Introduction: Mechanical surface treatments like deep rolling are well-established and commonly used in everyday practice, allowing for high strength and light weight vehicle components. The comparatively simple application on standard machines associated with a positive influence on fatigue life of cyclically loaded components are two of the numerous advantages [1]. It has been found in previous research that deep rolling at elevated temperature leads to a stabilisation of beneficial compressive residual stresses (see e.g. Fig. 1) [2, 3]. Responsible for this effect are dislocations pinned through static or dynamic strain ageing and precipitation of small carbides. Due to short austenitization times by fast and homogenous heating, inductive heat treatment leads to a favourable microstructure [4] with the advantage of short process time. For this reason, a systematic investigation of inductive heat treatment combined with deep rolling at elevated temperature is of high interest regarding safe and reliable components.

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