Effectiveness of cast iron vermicularization including ‘conditioning’ of the alloy
Journal Title: Archiwum Odlewnictwa - Year 2011, Vol 11, Issue 2
Abstract
The performed investigations have resulted in conclusion that the vermicularizing treatment of ‘basic’ cast iron, consisting in ‘conditioning’ the alloy by means of VLCe(2) master alloy, introducing the DENODUL5 master alloy, and graphitizing with SRF75 master alloy, provides for obtaining vermicular graphite precipitates in the structure of material cast within 15 minutes’ period from the modifying treatment. The cast iron has been melted in the induction crucible furnace of medium frequency under industrial conditions. The alloy has been subjected to vermicularization in the slender ladle of 1 Mg capacity. Graphitizing has been performed in the course of transferring the cast iron from the slender ladle to the pouring ladle. A series of test coupons in the form of reversed U-blocks of test part walls 25 mm thick have been cast of the produced cast iron. Then specimens both for metallographic examination and for testing the mechanical properties have been taken from the coupons. The analysis of cast iron structure has revealed, among others, that however purely vermicular graphite precipitates occurred in specimens taken out of the lower parts of test coupon walls (which are cooled faster), the nodular graphite precipitates in quantity up to 10% could be observed in specimens from the upper parts of test coupon walls (located close beneath the sinkhead).
Authors and Affiliations
M. S. Soiński, P. Mierzwa
Keywords
Related Articles
- EP ID EP72553
- DOI -
- Views 114
- Downloads 0
Microwave Absorption by Used Moulding and Core Sands
The paper presents measurement results of standing wave ratio to be used as an efficiency indicator of microwave absorption by used moulding and core sands chosen for the microwave utilization process. The absorption mea...
Plastic properties of cold-deformed ironbased sintered materials
Cold plastic forming of sintered metal powders has limited practical application because of, among others, the deformation degree and initial porosity of preforms. Cold forming is combined with a very drastic drop of pla...
Identification of temperature changes dynamics in selected castings as a contribution to performance life improvement
Parameters describing boundary conditions and dynamics of temperature changes during casting cooling in foundry moulds and the successive performance, especially as regards the massive cast elements, were discussed. Cons...
Abrasive wear resistance of high-vanadium cast iron
The study presents the results of tribological tests made on Fe-C-V and Fe-C-V-Si alloys undergoing volume solidification and containing carbon in a range of 1,43-2,58%, vanadium in a range of 5,34-14,77%, and silicon in...
Nitrogen hardening of creep-resistant G-NiCr28W alloy
In the group of creep-resistant materials, most important are heat-resistant nickel-based alloys. The G-NiCr28W alloy subject to detailed examinations was observed to have two different austenite-like phases. In the inte...