Analysis of Precipitates in Welded Joint of TP347H Stainless Steel

The precipitates in welded joint heat affected zone (HAZ) and base metal of TP347H stainless steel were observed and analyzed by SEM, TEM and EPMA. The results show that precipitate of NbC can be observed in welded joint HAZ in as-welded, and more NbC precipitate in high temperature service. The siz...

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Bibliographic Details
Published in:Key engineering materials 2021-04, Vol.881, p.25-30
Main Authors: Yao, Xiang Hong, Chen, Zhong Bing, Sun, Zhi Qiang, Zhang, Jian Lin
Format: Article
Language:English
Subjects:
Base metal
Bonded joints
Bonding strength
Grain boundaries
Heat affected zone
High temperature
Interfacial bonding
Niobium carbide
Precipitates
Stainless steel
Stainless steels
Welded joints
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Summary:The precipitates in welded joint heat affected zone (HAZ) and base metal of TP347H stainless steel were observed and analyzed by SEM, TEM and EPMA. The results show that precipitate of NbC can be observed in welded joint HAZ in as-welded, and more NbC precipitate in high temperature service. The size of primary NbC in base metal ranges from tens of nanometers to hundreds of nanometers, but only tens of nanometers of the precipitated NbC. The fine precipitate of NbC is mainly distributed in the crystal, however, continuous distribution of NbC is also observed on the grain boundary of the service joint. Cr carbide precipitates at the grain boundary, and some of particles distribute continuously on the grain boundary after service. The fine NbC precipitated in the crystal strengthens the matrix, and the continuous distribution of Nb and Cr carbides on the grain boundary reduces the interfacial bonding strength, then both of which result decrease of the material plasticity.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.881.25