The Gas Blow-Holes Forming in Nitrogen Iron Alloys and Steels during their Crystallization
Year: 1999
Type: article
Abstract: In the paper results of experimental research concerned with a precipitation of nitrogen in a form of gas blow-holes during crystallization of supersaturated alloys Fe-N, Fe-O-S-N and steels 1Cr13 and Cr18Ni10 have been described. It has been found that the precipitation of nitrogen gas blow-holes is more intensive and a pressure P N , is higher at low contents of surface active elements i.e. oxygen and sulphur. At concentration ([%O] + 0.5%[%S]) ≥ 300 ppm microingots have exhibited compact macrostructure without gas blow-holes. Results of a kinetic analysis of a process of desorption of a nitrogen and thermodynamic of investigated solution (also a surface tension) confirm that for the formation of gas blow-holes is decisive surface reaction. From this reason it is possible to climinate the formation of gas blow-holes in ingots of ferritic and ferritic-austenitic steels by insertion of such SAE admixtures as Sb. Te or Se. The formation of nitrogen gas blow-holes has not been ascertained during crystallization of austenitic steels.
Source: Materials science forum
Authors: A.G. Svjażin, J. Siwka, Z. Skuza, A. Hutny
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2087257308