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Information × Registration Number 0211U005625, 0111U008322 , R & D reports Title Estimate of serviceability of new graphitized steels for high-strength railway wheels popup.stage_title Head Kulyk Volodymyr Volodymyrovych, Registration Date 15-12-2011 Organization Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine popup.description2 Fatigue crack growth kinetics in steel structures produced as a result of temperature-force factors during braking is investigated. It is established that in comparison with the initial pearlitic-ferritic structure of steels significant acceleration of fatigue crack growth caused by the appearance of bainitic-martensitic phase is observed here. It happens when for high-strength steel ?Kfc value decreases from 59 to 45 MPa м1/2, and for medium-strength steel does not change. Fractography of certain fractures found local changes of fatigue fracture micromechanism for high-strength steel from trans- to intergranular as opposed to medium-strength steel. The influence of complex alloying of graphitic steels on strength, hardness, fatigue crack growth resistance characteristics is studied. The dependence of graphitic steel microstructure on the Mn, Cr, Ni і Mo content is estimated. It is established that fatigue crack growth resistance vary non-monotonic with the increase of strength and decrease of plasticity, and is optimal for graphitic steel containing 0,6% Mn, 0,3% Cr and 1,2% Ni. Product Description popup.authors Віра Володимир Володимирович Прокопець Валентина Василівна popup.nrat_date 2020-04-02 Close