Thermal Fatigue of Shot Peened or Hard Turned Hot-Work Steel AISI H11

Author:  KrauB, Scholtes
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002042
Year of Publication:  2002
Authors Martin KrauB, Berthold Scholtes, Institute of Materials Technology, University of Kassel, Kassel, Germany Introduction The lifetime of hot-work tools is often limited by the development of thermal fatigue cracks, which occur as a consequence of alternating temperatures connected with thermal stresses [1,2]. It is well known, that in the case of mechanically loaded components, strength or lifetime can be enhanced by appropriate mechanical surface treatments. This is mostly attributed to near surface residual stress distributions and strain hardening effects [3 - 5]. Although in the case of combined thermo-mechanical loading, near surface microstructures are expected to be less stable compared to isothermal conditions at moderate temperatures, the question arises, whether such beneficial effects can also be realized in the case of thermal fatigue. In what follows, characteristic results of such investigations are presented.

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