ASPECTS CONCERNING THE CRYSTAL LATTICE BEHAVIOR OF AUSTENITIC STEEL AT LOW TEMPERATURE

Marius BĂRĂIAN, George ARGHIR, Ioan PETEAN

Abstract


Two austenitic stainless steels for investigation under cryogenic condition were considered. Both X8CrNi18-12 and X12CrNi25-21 were investigated by X-ray diffraction at several cryogenic temperatures of 298 K, 223 K, 173 K, and 123 K. The crystal parameter and thermal linear expansion coefficient were calculated from the X-ray diffraction pattern. The major observation was the increasing of diffraction angles as temperature decreases. The X8CrNi18-12 crystal parameter presents a significant decreasing related to the same condition applied to X12CrNi25-21. We observe the same tendency for thermal linear expansion coefficient variation which means that X8CrNi18-12 becomes harder and more brittle than X12CrNi25-21 in the same cryogenic condition. Finally the X8CrNi18-12 proves to be useful for cryogenic applications which need high hardness instead of a good toughness and X12CrNi25-21 prove to be useful for cryogenic applications which need a better toughness.

Key words: X-ray diffraction, austenitic stainless steels, elementary cell

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References


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