IronThe eftects of Von the disbonding characteristics of the 2 1/4Cr-1 Mo steels overlayed by austenitic stainless steel were metallurgically studied.The addition of V to the 2 1/4Cr-1Mo steels significantly increases the resistance to disbond-
The effect of V on the disbonding between 2 1/4 Cr-1 Mo steels and austenitic stainless steel overlay was studied metallurgically.The addition of V into the base metal increases resistance to disbonding significantly.STEM and EDX observation showed that the fine precipitates are different in morphology, distribution and composition between V-modified and ordinary steels.The analyses of hydrogen diffusion and hydrogen evolution indicated that the fine precipiates in V-modified steel trap hydrogen and as a result increase the solubility of hydrogen and decrease the diffusion of hydrogen.Theoretical calculation of hydrogen distribution during cooling from high temperature and high pressure conditions showed that both diffusion and solubility of hydrogen in the base metal affects the concentration of hydrogen at the interface between base metal and stainless steel overlay.It is concluded that the fine precipitates in V-modified steel increase resistance to disbonding by reducing the concentration of hydrogen at the interface during cooling.
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