Effect of Volume-Surface Hardening on the Cyclic Strength of Fragments of Solebars of Freight Bogies
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The effect of volume-surface hardening (VSH) on the mechanical properties obtained in static and dynamic cyclic endurance tests of fragments of solebars from steel 20GL is studied. The VSH is shown the raise the mechanical properties of the fragments, i.e., the ultimate strength increases by a factor of 1.6 – 2, the conventional yield strength increases by a factor of 1.3 – 1.6, the bearing capacity increases by a factor of 2.6, the endurance limit increases by 10%, and the cyclic strength (durability) in the presence of a stress concentrator in the form of a notch increases by a factor of 3 at preserved high ductility.
Key words
volume-surface hardening freight bogie solebars mechanical propertiesNotes
The work has been performed with financial support of the Ministry of Education and Science of the Russian Federation within implementation of the Federal Target Program “Research and Development in Priority Directions of Advancement of the Scientific and Technological Complex of Russia in 2014 – 2020” (Agreement No. 14.581.21.0009 of 03.10.2014, Unique Identifier of the Project No. RFMEFI58114X0009).
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