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Cryogenic characteristics of austenitic stainless steel based on 304 steel with nickel and nitrogen were investigated at room temperature and -196℃. The alloys were fabricated by vacuum arc furnace and cold working after homogenization treatment. The addition of nickel and nitrogen decreased the stability of δ-ferrite and induced the stability against the formation of martensite to result significantly in enhancing ductility at -196℃. Nitrogen reduced Md temperature, which was beneficial to the tensile strength and elongation at 25℃ and -196℃.
The effect of variation of pack activators, compositions, temperature and time on the thickness and structure of aluminide coatings formed on the TiAl alloy was studied in one-step packs and two-step packs containing aluminum for the purpose of improvement of oxidation resistance. The thickness of coating layer was increased with increasing NH₄Cl content up to 3wt% and then it was saturated. Oxidation resistance of coating layers carried out at one step pack was superior to that of ones through of two step pack. The improvement of high temperature oxidation resistance was due to the formation of a protective Al₂O₃ surface layers and coating the alloys with TiAl₃phase.
The effects of Ni and N addition to 304 stainless steel on mechanical properties and microstructure were investigated within temperature ranged from -196℃ to 25℃. The addition of nickel and nitrogen induced the stability against the formation of provide significantly enhanced ductility at -196℃ and reduce the Md temperature. Fe-18Cr-10Ni-0.2N alloy showed the γphase in deformed structure which it was benefical to enhance the tensile strength and elongation at 25℃ and -196℃.