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Rule of the formation of precipitated phases in Cast Ni-base Hastelloy F alloy and their influences on the corrosion resistance of the alloy

Qin Zirui;Yao Man;Li Longsheng(Dalian University of technology)Yu Yong(Dalian Acid-proof Works)  
This paper investigates the morphology constituent,strruucture and formation condition of the precipitated phases in cast Ni-Cr-Mo containing Hastelloy-Falloy resistent to an“Oxidation-reduction”com- plex medium by using an optocal microsecope,x-ray diffraction-spectrum, EMPA and TEM,and also the influence of the precipitated phases and sensitization time on the corrosion resistance of the alloy.The results indicate that in the range 800℃ to 1200℃ there are P,μ,M_(6c) and a little phases precipitated in the alloy,the amount of which is less at about 900℃.The more the amount of the precipitated phases and the richer the Cr and Mo contained in the phases,the poorer the resistence to pitting and intergranuoar corrosion of the alloy. The prolongation of sensitization time will result in the decrease in the resistence to pitting and intergranular corrosion of the alloy,but has little influence on the general corrosion behaviour of the alloy.
【CateGory Index】: TG146.15
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