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Hardness Variation in P92 Heat‐Resistant Steel based on Microstructural Evolution during Creep
Author(s) -
Jiang Jun,
Zhu Lihui,
Wang Yanfeng
Publication year - 2013
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200265
Subject(s) - creep , laves phase , materials science , precipitation hardening , metallurgy , precipitation , hardening (computing) , indentation hardness , phase (matter) , microstructure , composite material , alloy , chemistry , intermetallic , physics , organic chemistry , layer (electronics) , meteorology
In order to optimize the strength of P92 heat‐resistant steel, the variation in hardness and microstructural evolution during creep were investigated. The results show that before crept for 1429 h at 873 K, the coarsening of M 23 C 6 is the main factor to decrease the hardness. When the creeping time prolongs from 1429 to 6063 h, the increase of hardness is mostly attributed to the precipitation of a large amount of Laves phase. Thereafter, the coarsening of Laves phase leads to the decline in hardness. The precipitation hardening resulting from MX drops distinctly in spite of the slight growth during creep. It is important to control the growth of MX, decrease the coarsening velocity of M 23 C 6 and keep Laves phase to be fine.