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Precipitates and Precipitation Strengthening of Sanicro 25 Welded Joint Base Metal Crept at 973 K
Author(s) -
Zhou Renyuan,
Zhu Lihui,
Liu Yanyan,
Lu Zhengran,
Chen Liang
Publication year - 2017
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.201600414
Subject(s) - creep , materials science , precipitation , welding , base metal , joint (building) , metallurgy , metal , composite material , structural engineering , engineering , meteorology , physics
In order to optimize the creep rupture strength of Sanicro 25 welded joints, the precipitates in Sanicro 25 welded joint base metal are investigated based on the microstructural evolution during creep at 973 K, and the contribution of precipitates to the precipitation strengthening is calculated. The precipitates in the as‐received Sanicro 25 welded joint base metal are primary NbCrN and MX, and creep results in the precipitation of secondary NbCrN, Cu‐rich particles and M 23 C 6 . Secondary NbCrN is extremely fine and stable during creep. The precipitation strengthening of secondary NbCrN, Cu‐rich particles, M 23 C 6 , and MX greatly contributes to the high creep rupture strength of Sanicro 25 welded joints. At least 58% of precipitation strengthening is contributed by secondary NbCrN and 28% is contributed by Cu‐rich particles. Secondary NbCrN and Cu‐rich particles are the key precipitates in improving the creep rupture strength of Sanicro 25 welded joints.