Publication :


Title:

Thermomechanical fatigue behaviour and life assessment of hot work tool steels

Authors: A. Oudin, P. Lamesle, L. Penazzi, S. Le Roux and F. Rezai-Aria
Year: 2002
Journal: European Structural Integrity Society.
Volume: 29, Pages: 195-201

DOI: 10.1016/S1566-1369(02)80076-0
Référencé ISI Web Of Science
Référencé Scopus

Abstract:
The surface of the hot work tools is damaged under coupled non-isothermal fatigue, wear or erosion and reactive environment (oxidation or corrosion). A thermomechanical fatigue (TMF) experiment using tubular specimens is developed. Tests are carried out under out-of-phase TMF cycle with strain ratio R = -∞. The behaviour, the damage and life of two tempered martensitic steels X38CrMoV5 and 55NiCrMoV7 (47 HRC) are assessed. The effect of the maximum temperature (Tmax) of thermal cycle is examined. Softening is observed for both steels. For a given mechanical strain amplitude (ltaεm), a drastic dependence on Tmax is observed. X38CrMoV5 has a better TMF life. The oxide-scale cracking and spalling are observed. TMF enhances the surface oxide-scales thicknesses. A phenomenological power law model, ltaεm = K(Tmax). Nfα, is proposed to predict the life under non-isothermal fatigue solicitations. The variation of constant K with Tmax is expressed by an Arrhenius type equation and the exponent a is taken constant.

Bibtex citation :
@article{Oudin2002,
Author={Oudin, A. and Lamesle, P. and Penazzi, L. and Le Roux, S. and Rezai-Aria, F.},
Title={Thermomechanical fatigue behaviour and life assessment of hot work tool steels},
Journal={European Structural Integrity Society},
Volume={29},
Number={},
Pages={195-201},
Year={2002}}


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