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Characterization of microstructure of HAZs in as-welded and service condition of P91 pipe weldments
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Characterization of microstructure of HAZs in as-welded and service condition of P91 pipe weldments
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Journal Article
Characterization of microstructure of HAZs in as-welded and service condition of P91 pipe weldments
2017
Overview
Steels 9-12% Cr, having the high creep rupture strength are advocated for the modern low polluting thermal power plants. In the present investigation, the P91 pipe weldments have been characterized for microstructural responses in as-welded, post-weld heat treatment (PWHT) and ageing conditions. The PWHT of welded samples were carried out at 760 °C for time of 2 h and ageing at 760 °C for 720 h and 1440 h, respectively. The effect of time has been studied on precipitates size, distribution of precipitates and grain sizes present in various zones of P91 steel weldments. The impact toughness and hardness variation of heat affected zone (HAZ) have also been studied in as-welded condition as well as at different heat treatment condition. A significant change was observed in grain size and precipitates size after each heat treatment condition. The maximum impact toughness of HAZ was obtained after PWHT at 760 °C for 2 h. The main phase observed in weld fusion zone in as-welded, PWHT and ageing conditions were M
23
C
6
, MX, M
7
C
3
, Fe-rich M
3
C and M
2
C. The unwanted Z-phase (NbCrN) was also noticed in weld fusion zone after ageing of 1440 h.
Publisher
The Korean Institute of Metals and Materials,Springer Nature B.V,대한금속·재료학회
