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The effect of Nb, V, N and Al on the creep rupture strength of 9–12 % Cr steel
Author(s) -
Kubon Zdenek,
Foldyna Václav
Publication year - 1995
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199501143
Subject(s) - creep , chromium , vanadium , materials science , vanadium nitride , metallurgy , ferrite (magnet) , solubility , precipitation , austenite , chemical composition , flexural strength , nitrogen , nitride , composite material , microstructure , chemistry , physics , organic chemistry , layer (electronics) , meteorology
The creep resistance of advanced chromium steels can be significantly increased due to precipitation of very small particles of vanadium nitride VN. The solubility and precipitation of VN, Nb(C,N) and AIN in austenite and ferrite was analysed using relevant solubility products. The calculated values of nitrogen in solid solution were used for assessment of creep rupture strength of chromium steel (mean considered chemical composition, mass contents in %: 0.18 C; 10.5 Cr; 1.0 Mo; 0.2 V; 0.07 Nb; 0.05 N; 0.01 Al). Increasing N mass contents from 0.03 to 0.07 % leads to increasing creep rupture strength in 100 000 h at 600°C of about 60 %. Lowering AI mass contents from 0.045 to 0.005 % produces higher creep rupture strength of about 30 %.