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Effects of Multiple Post Weld Heat Treatments on Microstructure and Precipitate of Fine Grained Heat Affected Zone of P91 Weld
Author(s) -
Wang Yu,
He Wanjun,
Zeng Qunfeng,
Zhu Jianing
Publication year - 2019
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.201800607
Subject(s) - lath , carbide , materials science , martensite , microstructure , metallurgy , welding , creep , heat affected zone , hardening (computing) , dislocation , composite material , layer (electronics)
To understand the potential impact of multiple post weld heat treatments (PWHTs) on service life of P91 weld, the multiple PWHTs are designed and carried out to explore their influences on microstructure and precipitate of fine grained heat affected zone (FGHAZ) of the P91 weld. The results show that the multiple PWHTs cause the recovery of martensite matrix (specifically, the elimination of lath‐like structure and the decrease of dislocation's density) and the evolution of M 23 C 6 carbide (specifically, the coarsening of M 23 C 6 carbide and the change of its distribution). The recovery of martensite matrix and the coarsening of M 23 C 6 carbide are undesirable in terms of the creep resistance of the FGHAZ. Besides, the change trend of hardness is consistent with that of M 23 C 6 carbide density, indicating that the dispersion hardening introduced by the M 23 C 6 carbide plays a dominant role in hardening effect.