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Abstract

Investigations have been carried out on the creep behaviour of the two austenitic steels HK 30 (a low carbon version of HK 40) and Alloy 800 H in air and in a carbonaceous atmosphere. For the latter the material has been tested either under continuous carburization or in the pre-carburized condition. Increasing the carbide content leads to an increase of the creep rate for both alloys at short and medium test durations, whereas the rate becomes lower at longer test times. Regarding the strength properties such as 1% creep strength and creep rupture strength, it is found that HK 30 exhibits a degradation at short and medium test times, whereas an improvement occurs for long term testing. For Alloy 800 H the 1% creep strength behaves in the same way, whereas the creep rupture strength is found to be improved for the whole stress range employed when testing is conducted under carburizing conditions. The creep ductility is found to be improved when the materials have been highly carburized.

Additional information

Authors: GUTTMANN V JRC PETTEN ESTAB. (THE NETHERLANDS) BUERGEL R BROWN, BOVERI & CIE, MANNHEIM (GERMANY) , JRC PETTEN ESTAB. (THE NETHERLANDS);BROWN, BOVERI & CIE, MANNHEIM (GERMANY)
Bibliographic Reference: CORROSION RESISTANT MATERIALS FOR COAL CONVERSION SYSTEMS, SUDBURY HOUSE, LONDON (UK), MAY 5-7, 1982 PP. 423-438, PROCEEDINGS, WRITE TO APPLIED SCIENCE PUBLISHERS LTD., RIPPLE ROAD, BARKING, ESSEX (ENGLAND)
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