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Metallurgist

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Use of Directional Solidification for Improving Tubular Workpiece Quality of Different Cast Irons

  • V. F. Bevza
  • V. P. Grusha
  • V. A. Krasnyi
Article
  • 3 Downloads

A new efficient method of casting tubular billets by directional solidification without the use of a core is proposed making it possible to obtain a fine-grained dense structure of cast iron due to intensive onesided heat removal and excess supply to the solidification front of superheated liquid phase during the entire billet formation time in a metal water-cooled mold (crystallizer). It is shown that the method makes it possible to obtain a prescribed final cast iron structure by creating a certain cooling regime for castings outside the mold. In the positive effect of directional solidification of the melt inherited by iron a decisive role is played by the formation of a dense structure and a more dispersed carbide eutectic with a favorable carbide morphology, which determines the good cast iron wear resistance. The results of studies confirm that the new casting method provides production of workpieces with a prescribed phase composition and improved physical, mechanical, and operating properties. The effect is considered of various factors of the formation of workpieces from different types of cast iron: gray alloyed with lamellar graphite, high-strength and high-chromium, and also Niresist cast iron, on the structure, properties and service life of components for critical purposes of general, mining and oil refining engineering.

Keywords

directional solidification microstructure tubular billet alloyed gray cast iron austenitic cast iron Niresist cast iron 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.GNU Institute of Metal TechnologyBelarus’ Academy of SciencesMogilevBelarus
  2. 2.FGBOU VO St Petersburg Mining UniversitySt PetersburgRussia

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