Khajuria, A and Modassir, A and Bedi, R and Kumar, Rajneesh and Ghosh, M and Das, C R and Albert, S K (2020) Influence of boron on microstructure and mechanical properties of Gleeble simulated heat-affected zone in P91 steel. International Journal of Pressure Vessels and Piping, 188 (IF-2.230).
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In the present endeavor, a Gleeble thermo-mechanical simulator has been used to simulate subzones of the heat-affected zone (HAZ) of boron-free P91 and boron-modified P91B steels to investigate the influence of boron on microstructure and mechanical properties. The prior austenite grain (PAG) size remained similar to that of parent metal in the fine-grained heat-affected zone (FGHAZ) and inter-critical heat-affected zone (ICHAZ) of P91B steel. The microhardness value of simulated specimens, including parent metals was observed to be similar. But impression creep resistance of boron-containing steel was significantly higher than that of the boron-free steel. The presence of boron decreased precipitates size and increased fraction of low energy Σ3 coincident-site lattice (CSL) boundaries that attributed to improvement of creep resistance. However, there was a slight reduction in solid solution hardening due to increased area fraction of precipitates in parent metal and simulated specimens of boron-containing steel. Hindering of alloy element partitioning during impression creep of P91B-ICHAZ was observed, which was possibly due to the presence of boron in soluble form in the iron matrix and the segregated form on grain and sub-grain boundaries (SGBs). Further, the addition of boron was observed to retard M23C6 precipitate coarsening in the P91B-ICHAZ in comparison to its P91 version.
|Uncontrolled Keywords:||Cr-Mo steel,Effect of boron,Gleeble simulation,Electron back scattered diffraction,Impression creep,Microhardness|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||25 Nov 2020 17:13|
|Last Modified:||25 Nov 2020 17:13|
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