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Effect of atmosphere in a foundry mould on casting surface quality

Chojecki A., Mocek J.

Archives of Foundry Engineering

2012

Vol. 12, iss. 1

13-18

Changes of gas pressure in the moulding sand in the zone adjacent to mould cavity were analysed during pouring of cast iron. No significant effect of pressure on the surface quality of castings was observed. In the second series of tests, the concentration of hydrogen in the gas atmosphere was measured. It has been found that the value of this concentration depends on metal composition and is particularly high in cast iron containing magnesium. This is due to the reduction of water vapour with the element that has high affinity to oxygen. The presence of hydrogen causes the formation of gas-induced defects on the casting surface.

Determination of influence of thermo-cycles on hydrogen cracking of steel

Skalsky V., Rudavskyy D., Matvijiv Y.

Diagnostyka

2009

nr 2(50)

19-22

Influence of thermo-cycles "heating-cooling" on the hydrogen induced cracking of structural steels, which are widely used in the heat-power equipment is investigated in this paper. An acoustic emission method of diagnostics of specimens made of exploited and non-exploited material of steam pipelines is described. Effective diagrams of dependence of number of events on heat cycle number for the all groups of specimens are plotted.

Devices for measurements of hydrogen concentration in gases

Nicolaev I. N., Utochkin Y. A.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

1998

z. 46

247-250