Boron Segregation and Creep in Ultra Fine Grained Tempered Martensite Ferritic Steels

0024897 - ÚFM 2010 RIV CZ eng J - Journal Article
Eggeler, G. - Dlouhý, Antonín
Boron Segregation and Creep in Ultra Fine Grained Tempered Martensite Ferritic Steels.
[Segregace boronu a creep v temperovaných martenzitických ocelích s ultrajemným zrnem.]
Zeitschrift für Metallkunde. Roč. 96, č. 7 (2005), s. 743-748. ISSN 0044-3093
R&D Projects: GA ČR(CZ) GA106/99/1172; GA ČR(CZ) GA106/93/0965
Institutional research plan: CEZ:AV0Z20410507
Keywords : Ultra-fine grained materials * Tempered martensite ferritic steels * Boron segregation
Subject RIV: JG - Metallurgy
Impact factor: 0.842, year: 2005

The creep strength of ultra fine grained tempered martensite ferritic steels with 9 to 12 wt-% Chromium is significantly increased when small amounts of Boron (in the 100 wt-ppm regime) are added. In the present note, experimental evidence from the literature is reviewed and previous explanations for the role of Boron are summarized. The explanation for the effect of Boron on creep strength must leave space for the simultaneous effect of Boron on ductility. A scenario is suggested where Boron segregates to micro grain boundaries which often have subgrain boundary character.

Creepová pevnost temperovaných martenzitických ocelí (9-12% Cr) s jemným zrnem významně vzrůstá při malé přísadě bóru (100 hm ppm) ve slitině. V práci jsou shrnuta dosavadní experimentální data publikovaná v literatuře spolu s možnými interpretacemi uvedeného jevu.
Permanent Link: http://hdl.handle.net/11104/0115368