Notice of RetractionStudy on hot forging parameter of high nitrogen retaining ring steel

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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The hot forging parameter of Mn18Cr18N retaining ring steel were studied in the temperature range 9500~1200°C and strain rate range 0.005~0.5 s^-1 using hot compression tests. Processing maps for hot working were developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate, interpreted using a dynamic materials model. A hot deformation equation is given to characterize the dependence of peak stress on the temperature and strain rate. A hot deformation apparent activation energy of Mn18Cr18N is about 563 kJ/mol. The maps exhibit a clear domain with its peak efficiency at about 1100~1150°C and 0.005~0.01 s-1; the domain has its peak efficiency of about 40% for different strains. On the basis of hot deformation microstructural observations, the full recrystallization region can be identified in the processing map at the domain.