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Production Of High-Chromium Powder White Cast Iron By Hot Forging Porous Preforms In The Presence Of Liquid Phase

  • : Vladimir Dorofeyev1, Anna Sviridova1, Alexander Babets2, Tatyana Goncharova3, Roman Vodolazhenko4
  • : 1Platov South-Russian State Polytechnic University (NPI), 2Kompozit Scientific & Engineering Center Ltd, 3Rostov State University of Civil Engineering, 4Moscow State University of Civil Engineering (National Research University)
  • : PDF Download
  • : 2018

Abstract

High-chromium white cast iron is characterized by high wear resistance but it is poorly treated with metal-cutting tool and has low impact strength. In the present work the possibility of obtaining high-chromium powder white cast iron by hot forging porous preforms has been studied. The powder was obtained by milling chips of cast iron after annealing. To reduce the tendency of the resulting material to brittle fracture the powder of cast iron was mixed with silicocalcium. The temperature of heating porous preforms prior to deformation and the silicocalcium content in the blend were varied. The possibility of obtaining defect-free forgings with an optimum content of silicocalcium has been determined. Incorporation of silicocalcium additives promotes the grain refining and the formation of equiaxial structure of the eutectic colonies in the fusion zones due to the formation of a great quantity of centers of crystallization of original austenite. This provided the possibility of a significant increase in the impact strength and thermal shock resistance as well as the strength of high-chromium powder white cast iron. In this case high wear resistance of cast iron has remained intact.

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