Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8961322 | International Journal of Hydrogen Energy | 2018 | 11 Pages |
Abstract
In the present work, the mechanical properties and hydrogen interaction with microstructures obtained after thermal treatment of a 2.25Cr-1Mo-0.25V bainitic steel were investigated. The samples were heat-treated under two different conditions simulating shop-repairs and manufacturing procedures of reactors. The microstructures after each heat treatment showed MC, M2C, and M7C3 carbides, characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The hydrogen diffusivity values after the first permeation for both conditions were 4.2Â ÃÂ 10â11Â m2sâ1 and 8.6Â ÃÂ 10â11Â m2Â sâ1, and the solubility was 7.4Â molHmâ3 and 5.3Â molHmâ3, showing the influence trapping in the behavior of permeation curves. The TDS results indicate that a greater hydrogen trapping capability can be achieved with one of the studied conditions. Tensile testing of the hydrogenated and heat-treated samples, showed that the number of heat treatment cycles has a strong influence on the loss of ductility, which is mainly due to carbide growth and coalescence.
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Authors
A.L. Cardenas, R.O. Silva, C.B. Eckstein, D.S. dos Santos,