Assessing the Influence of Different Forging Process Parameters on the Local Fatigue Properties of a Precipitation Hardening Ferritic-Pearlitic Steel

  • Matthias HellEmail author
  • Rainer Wagener
  • Tobias Melz
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The use of precipitation hardening ferritic-pearlitic steels for forged components opens up huge potential for the reduction of CO2 emissions and production costs by avoiding additional heat treatment. The material properties are calibrated by a defined cooling process, which utilizes the forging heat still stored in the component. Related to the sensitivity of the material properties to the deformation and temperature gradient, the influence of process parameters on the local properties has to be assessed experimentally by fatigue testing with small scale specimens. With respect to an improved and physically sound numerical modelling of the local strain response to the external load-time function for the fatigue assessment of components, the local property distributions have to be examined with specimens manufactured either by a process simulation of the forging and the consecutive cooling process or extracted existing components made from identical material. Based on the results of the fatigue testing for specimens with defined logarithmic strain and cooling gradient, a local stress–strain behavior and fatigue properties can be assigned during the numerical evaluation of the local strain response to an external load-time function.


Fatigue life Durability Forging Stress–strain behaviour PHF steel Material properties 



The research project AVIF A308 ‘Prozessbedingte Betriebsfestigkeit’ is funded by the charitable foundation Stahlanwendungsforschung im Stifterverband für die Deutsche Wissenschaft e.V. Aim of the foundation is the promotion of research within the field of steel processing and application in the Federal Republic of Germany.


  1. 1.
    Ramberg W, Osgood WR (1943) Description of stress-strain curves by three parameters. National Advisory Committee for Aeronautics Technical Note No. 902Google Scholar
  2. 2.
    Coffin LF (1954) A study on the effect of cyclic thermal stresses on a ductile metal (trans: ASME) 76:931–950Google Scholar
  3. 3.
    Manson SS (1965) Fatigue: a complex subject—some simple approximations. Exp Mech 5(7):45–87. Scholar
  4. 4.
    Basquin OH (1910) The exponential law of endurance tests. Proc ASTM 10:625–630Google Scholar
  5. 5.
    Morrow JD (1965) Cyclic plastic strain energy and fatigue of metals. ASTM STP 278:45–87. Scholar

Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.Fraunhofer Institute for Structural Durability and System Reliability LBFDarmstadtGermany

Personalised recommendations