Thermal aspects of temperature transformations in silica sand
Journal Title: Archiwum Odlewnictwa - Year 2010, Vol 10, Issue 3
Abstract
Problems related with the choice of moulding sand composition considering its behaviour in contact with molten metal were discussed. The investigations of high-temperature phenomena enable moulding sand composition to be evaluated in terms of its applicability under the specific conditions of a foundry shop. It is also possible to eliminate the casting defects related to moulding sand and its properties. The investigations were carried out on selected moulding sands from the family of the traditional carbon-free moulding mixtures. The effect of moulding sand composition and moisture content on the linear dilatation and stress formation caused by an allotropic quartz transformation was determined. The investigated phenomena were analysed on 3D diagrams plotted from the test data. A strong effect of the beta quartz - alpha quartz transformation at a temperature of about 6000C was stated.
Authors and Affiliations
J. St. Kowalski
Keywords
Related Articles
- EP ID EP72148
- DOI -
- Views 107
- Downloads 0
Bainitic-martensitic nodular cast iron with carbides
In this paper the possibility obtaining of upper bainite, lower bainite and martensite or their mixture in nodular cast iron with carbides has been presented. Conditions have been given, when in nodular cast iron with ca...
Effect of silicon on the structure and mechanical properties of high-vanadium cast iron
The results of microstructural examinations and mechanical tests carried out on Fe-C-V and Fe-C-V-Si alloys solidifying in volumetric mode, containing 1,38-1,83%C, 6,76-14,72%V and 1,05-3,69 Si, have been reported. The e...
Microhardness and tribological wear of the steels remelted with an electric arc
This study presents results of a research on the surface strengthening of the C15, C45 and C90U steels by application of concentrated heat stream with the GTAW methodology. Utilizing the GTAW methodology remelting of the...
Control of rebonding sand mixing as a condition for optimisation of the sand feeding system in the casting line
In order to ensure the effective operation of the casting line, synthetic sand containing bentonite has to be fed in a precisely controlled quality and quantity. The required quantity is ensured by mixing stations outfit...
Fatigue strength of MAR-M509 alloy with structure refined by rapid crystallization
This study presents test results of high-cycle (N>2⋅107) fatigue bending strength of MAR-M-509 cobalt alloy samples, as cast and after surface refining with a concentrated stream of heat. Tests were conducted on samples...