Isothermal Fatigue of Tool Steel AISI H11
2008; Wiley; Volume: 79; Issue: 2 Linguagem: Inglês
10.1002/srin.200806325
ISSN1869-344X
AutoresA. Grüning, Martin Krauß, Berthold Scholtes,
Tópico(s)Metal Alloys Wear and Properties
ResumoLifetime of hot-work tools is often limited by the development of crack nets as a consequence of thermal and/or mechanical fatigue loading. In this paper, the isothermal fatigue behaviour of the tool steel AISI H11 (German grade X38CrMoV 5-1) under stress controlled uniaxial tension-compression loading with zero mean stress is investigated in the temperature range between room temperature and 500 °C. Different surface conditions (polished, shot peened, hard turned) were taken into account and a small influence of the near-surface states on the measured plastic strain amplitudes could be detected. In all cases, for the most part, strain softening occurred with increasing numbers of cycles, which is also influenced by the stress amplitude applied. Due to manufacturing induced near-surface compressive residual stresses and strain hardening, shot peened specimens exhibit higher fatigue lifetimes than hard turned or polished ones.
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