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Fe-Mn-Al 합금의 감쇠능 및 인장성질에 미치는 가공유기 마르텐사이트 상의 영향
엄정호(J. H. Eom),강창룡(C. Y. Kang),김창규(C. K. Kim) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The damping capacity and strength of Fe-25Mn-2Al and Fe-25Mn-6Al alloy have been investigated for the development of new materials with high strength and damping capacity. The results obtained from this study as follow : The microstructure in Fe-25Mn-2Al and Fe-25Mn-6Al at room temperature consist of a large quantity of the austenite structure and a small quantity of a' and e martensite, and α' and ε martensite was increased by increasing the degree of cold rolling. Two specimens of cold rolled Fe-Mn-Al alloys have the microstructure that were α' and ε martensite phase, and increasing the degree of cold rolling, the volume fraction of ε martensite decreased after rising to maximum value at specific level of cold rolling, the volume fraction of α' martensite slowly increased and then dramatically increased from the point of decreasing ε martensite volume fraction. The damping capacity is strongly affected by the content of ε martensite, but the other phase such as α' martensite and austenite phase is not, actually exhibit little effect on damping capacity. The tensile strength increases and the elongation decreases with increasing the volume fraction of α' martensite, consequently they are proved that tensile strength is mainly affected by the content of α' martensite.
Fe-12Cr-22Mn-X 합금의 강도, 감쇠능 및 플라즈마 이온 질화 특성에 대한 연구
이도훈(D. H. Lee),엄정호(J. H. Eom),손동욱(D. W. Son),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
To obtain the proper surface hardening layer, maintaining the damping capacity and mechanical properties, Co and Al element was added to Fe-12Cr-22Mn alloy. The studies of damping capacity, mechanical properties and plasma ion nitriding characteristics of Fe-12Cr-22Mn-X alloys studied can be summarized thus : The volume fraction of ε-martensite was increased with the increase of degree of cold rolling for two specimens, as followed was decreased after maximum value. And damping capacity has been shown as the same transformation behavior. While tensile strength was linearly increased with increasing the degree of working due to transforming austenite to martensite by working for two specimens, elongation was dramatically decreased at early stage but slowly decreased with increasing the degree of cold rolling. While the E martensite content influenced on damping capacity, in case of a ' martensite, it influenced on tensile strength. And it was possible to obtain the coefficient of friction with over 1.5x 10-3 and the strength value with over 80 kgf/㎜2. The size of the effective case depth of both specimens increase with increase of nitriding time, temperature. We could obtain the effective case depth of about 30㎛ in specimens added Co and the effective case depth of about 36㎛ in specimens added %AI, after specimens were nitrided at 490℃ for 12 hours.