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Internal Intensive Quenching: ideal heat treatment of hard accessible component sections

M.Sc. Fabian Mühl


  • Internal Intensive Quenching (IIQ) is a heat treatment method to improve the fatique strength of internal loaded high pressure components
  • A higher strength in surfaces that are hard to access can be reached over a configuration of residual stresses, mircrostructure and work hardening
  • An early feasibility-study showed that a stengthening of through-hole cylindric parts can be realized over the IIQ process


  • Development of a procedure for the optimal adjustment of residual stresses, mircrostructure and work hardening in internal loaded high pressure components
  • Construction of a FEM-Model to predict all phenomena which occur during a heat treatment over IIQ
  • Based on the FEM-Model an optimization of the IIQ-Process with regard to resiudal stresses, the development of cracks and the microstructure should be achieved


  • Experimental investigations of the IIQ-Process and characterisation of the generated surface condition ( Microstructure,residual stresses,cracks)
  • Developement of a numerical evaluation tool to correct the experimentally determined residual stresses
  • Modelling of the bainite formation and the martensite kinetic under stresses
  • Modelling of the mechanical properties as a function of triaxiality, strainrate and temperature
  • FEM simulation of the IIQ-process based on the created models for the heat treatment