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윤재홍,박노광,현용택 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-
Thermogravinetric measurement and oxide scale analysis have been done to study the oxidation behaviour of A335, A437 alloy and Nitrided A355, A437 in high temperature steam environment. When A335, A437, and Nitrided A335, A437 was oxidized under high temperature water vapor had been formed oxide scale consist of two layer structure. At all the temperatures parabolic kinetics was observed in the oxide scale formation, and its apparent activation energies were estimated to be 20.0kcal/mol for A335 and 61.05kcal/mol for A437, respectively. But apparent activation energies in case of Nitrided A437 and A355 alloy was 25.9kcal/mol, 16.68kcal/mol respectively. With the increase of Cr content in the alloys the oxidation rates decreased. The case of surface nitriding alloys was rather weakened high temperature water vapor resistance than non-nitirding alloy. The oxide scales of A437 alloy were identified as ??, ??, ??, ?? matrix form the surface. The oxide scales of A355 alloy were identified as ??, (Al, Cr, Fe)??, matrix from the surface.
가공열처리에 의한 Ti-1100 과 IMI 834 합금의 미세조직과 기계적 성질의 변화
이용태,현용택 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.7
Solution heat treatment and more complex thermomechanical treatments were performed on the recently developed two near-α Ti alloys, Ti-1100 and IMI 834. Equiaxed, bimodal and β-transformed lamellar α+βmicrostructures were provided with both alloys. This study was intended to obtain the optimum mechanical properties and to rank these alloys. To investigate the mechanical properties of these alloys, tensile tests were conducted at temperatures ranging from room temperature to 700℃. High cycle fatigue(HCF) tests were performed at room temperature and at 400℃. Creep tests were done at 600℃. Test results exhibited that all the mechanical properties of the IMI 834 were slightly superior to those of the Ti-1100. Creep strength of the bimodal microstructure was always about 50MPa lower than that of the lamellar structure up to 700℃. Considering overall properties, however, the bimodal microstructure produced by a thermomechanical treatment done just below the Q-transus temperatures exhibited the most optimum properties. The thermomechanical treatments change the microstructures and consequently influence the mechanical properties. This process can be used to meet the special requirements for either room-or high-temperature applications.