Carburizer Effect on Cast Iron Solidification

Abstract

This paper presents the effect of carburizing materials on cast iron solidification and crystallization. The studies consisted of cast iron preparation from steel scrap and different carburizers. For a comparison, pig iron was exclusively used in a solid charge. Crystallization analysis revealed the influence of the carburizer material on the crystallization curves as well as differences in the solidification paths of cast iron prepared with the use of different charge materials. The carburizersÕ influence on undercooling during the eutectic crystallization process was analyzed. The lowest undercooling rate was recorded for the melt with pig iron, then for synthetic graphite, natural graphite, anthracite, and petroleum coke (the highest undercooling rate). So a hypothesis was formulated that eutectic cells are created most effectively with the presence of carbon from pig iron (the highest nucleation potential), and then for the graphite materials (crystallographic similarity with the carbon precipitation in the cast iron). The most difficult eutectic crystallization is for anthracite and petroleum coke (higher undercooling is necessary). This knowledge can be crucial when the foundry plant is going to change the solid charge composition replacing the pig iron by steel scrap and the recarburization process.

MMA Repair Welding of Nodular Cast Iron GJS 350-22

“…When repairing iron castings it is necessary to pay attention to several aspects, i.e. to maintain material continuity, tightness and appropriate strength as well as to obtain the colour of a weld similar to that of the base material [5][6][7][8][9].…”

Microstructural Evolution During Laser Surface Alloying of Ductile Cast Iron with Titanium

“…In the last decade much emphasis has been placed on the enhancement of surface properties of the cast iron, such as its wear and corrosion resistance [1][2][3]. The most of reported works have been focused on laser surface modification methods of the cast iron, mainly laser surface melting (LSM) and alloying (LSA) processes [4][5][6].…”

Repair welding of cast iron coated electrodes

“…The repair of castings can be made in different ways from typical foundry methods were material is refilled (casting-on), welding with coated electrodes GMA, TIG. Repair can be performed using mechanical strapping material (metalock method) or by using the insoles, which are intended to replace the material with defects [1][2][3][4][5][6][7][8][9].…”

“…This method has a high versatility, can I use when we have small defects in the material or the big disadvantages. Selection of welding parameters, respectively, you can enter a small amount of warm which is recommended for welding of cast iron, since it is sensitive to processes where we provide heat with subsequent cooling [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”