Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575711 | Materials Science and Engineering: A | 2014 | 10 Pages |
Abstract
The effect of aging on four heat-resistant cast stainless steels heat treated for various durations at 820 °C was investigated and is described in this paper. The steels were examined in terms of their microstructure and mechanical properties. Microstructural characterization of the steels revealed complex microstructures with a large number of carbide precipitates in an austenitic matrix. The as-cast materials contained carbides as clusters or networks, which were almost fully dispersed in the specimens aged for 1200 h. The Ï-phase was identified in each steel grade after only 100 h of aging, although in an austenitic-ferritic grade, it was identified already in the as-cast condition. Impact toughness results revealed the embrittlement of each studied steel grade after only 100 h of aging at 820 °C. The hardness values for the steels increased slightly and almost linearly with increase in the aging time. The results of this study indicate that the formation of the Ï-phase is primarily responsible for the observed embrittlement, while the increase in hardness may be explained by the formation of the Ï-phase and the dispersion of the carbides. These results are presented and discussed in this paper.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
M. Viherkoski, E. Huttunen-Saarivirta, E. Isotahdon, M. Uusitalo, T. Tiainen, V.-T. Kuokkala,