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Isothermal Fatigue of Tool Steel AISI H11
Author(s) -
Grüning Alexander,
Krauß Martin,
Scholtes Berthold
Publication year - 2008
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200806325
Subject(s) - materials science , residual stress , peening , isothermal process , hot work , shot peening , metallurgy , softening , work hardening , composite material , tool steel , compression (physics) , microstructure , thermodynamics , physics
Lifetime 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.