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마르텐사이트와 오스테나이트의 2상 혼합조직을 갖는 고 Mn 오스테나이트 스테인리스강의 감쇠능
황태현 ( Tae Hyun Hwang ),강창룡 ( Chang Yong Kang ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.9
Abstract: The damping capacity of high manganese austenitic stainless steel with a two phase mixed structure of deformation-induced martensite and reversed austenite was studied. Reversed austenite with an ultra-fine grain size of less than 0.2 μm was obtained by reversion treatment. The two phase structure of deformation-induced martensite and reversed austenite was obtained by annealing treatment at a range of 500-700℃ and various times in cold rolled high manganese austenitic stainless steel. The damping capacity increased with an increasing annealing temperature and time. In high manganese stainless steel with the two phase mixed structure of martensite and austenite, the damping capacity decreased with an increasing volume fraction of deformation-induced martensite. Thus, the damping capacity was strongly affected by deformation-induced martensite. The results confirmed that austenitic stainless steel with a good combination of strength and damping capacity was obtained from the two phase mixed structure of austenite and martensite.
고 Mn 오스테나이트계 스테인리스강의 기계적 성질에 미치는 가공온도의 영향
강창룡(Chang-Yong Kang),허태영(Tae-Young Hur),김영화(Young-Hwa Kim),구차진(Cha-Jin Koo),한현성(Hyun-Sung Han),이상희(Sang-Hee Lee) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.3
This study was carried out to investigate the effect of the deformation temperature in high manganese austenitic stainless steel. a’-martensite was formed with a specific direction by deformation. The volume fraction of the deformation induced martensite was increased by increasing the degree of deformation and decreasing the deformation temperature. With the increase in the deformation, the hardness and tensile strength were increased, while the elongation was rapidly decreased at the initial stage of the deformation, and then gradually decreased. The hardness and tensile strength were increased and the elongation was decreased with adecrease in the deformation temperature. The hardness and tensile strength were strongly controlled by the volume fraction of martensite, but the elongation was controlled by the transformation behavior of the deformation induced martensite.
Fe-Mn 합금에서 열적 ε 마르텐사이트와 변형유기 ε 마르텐사이트 부피분율에 대한 진동감쇠능의 의존성
전중환 ( Joong Hwan Jun ),홍권표 ( Kwon Pyo Hong ),최종술 ( Chong Sool Choi ) 한국열처리공학회 2002 熱處理工學會誌 Vol.15 No.6
N/A The changes in damping capacity with volume fractions of thermal and deformation-induced ε marten-sites were compared and analyzed in an Fe-23%Mn alloy. The volume fraction of thermal ε martensite increased with decreasing cooling temperature, whereas that of deformation-induced ε martensite increased steeply up to 10% of cold rolling and nearly saturated in further cold rolling. In the case of thermal ε martensite, the damping capacity increased linearly with the increase in ε martensite content. For the deformation-induced ε martensite, however, the damping capacity increased continuously up to 70% of ε martensite, over which it decreased suddenly. TEM microstructures showed that the deterioration of damping capacity above 70% of deformation-induced ε martensite is ascribed to the introduction of perfect dislocations, which play a important role in inhibiting the movement of damping sources such as stacking fault boundaries inside ε martensite, ε martensite variant boundaries and γ/ε interfaces.
냉간압연한 고 Mn 오스테나이트계 스테인리스강의 기계적성질에 미치는 서브제로처리의 영향
황태현 ( T H Hwang ),정목환 ( M H Jung ),이종영 ( J Y Lee ),이향백 ( H B Lee ),강창룡 ( C Y Kang ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.5
The effect of subzero treatment on the mechanical properties of cold rolled high manganese austenitic stainless steel was investagated. α`-martensite was formed by cold rolling, and it was formed with surface relief and specific direction or crossing each other. The volume fraction of martensite increased by subzero treatment, and it was increased with longer time of subzero treatment and higher temperature of subzero treatment. The hardness and strength increased by subzero treatment, while the elongation decreased. With the increase of volume fraction of martensite, the hardness and strength was increased steeply with proportional relationship, elongation was decreased slowly. The results show that the hardness and strength was strongly controlled by the volume fraction of martensite, and the elongation was affected by transformation behavior of deformation induced martensite in the initial stage of deformation.
Jung-Su Kim,Jong Bae Jeon,Joong Eun Jung,Kyung-Keun Um,Young Won Chang 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
Metastable ε-martensite (ε-Ms) formed during a prior heat treatment of Fe-12Mn steel has been reported totransform into α-Ms during subsequent inelastic deformation. This deformation induced phase transforma-tion (DIPT) from ε-Ms to α-Ms has been investigated in the present study within the framework of kineticsrelation proposed based upon an internal variable theory of inelastic deformation. The ε-Ms phase was found tobecome more stable at lower temperatures to provide more prolonged DIPT from ε-Ms to α-Ms during aninelastic deformation at cryogenic temperatures, contrary to the case of austenite phase in various transformationinduced plasticity steels being more stable at higher temperatures. This reversed stability-temperature rela-tionship in Fe-12Mn steel appeared to provide a significant ductility enhancement at lower temperatures as wellas significant strengthening effect.
Lixin Li,Sheng Liu,Ben Ye,Shengde Hu,Zhifeng Zhou 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.3
A constitutive model including the kinetics of twinning and martensitic transformation has been established based on the dislocation theory and the mixture law. The stress-strain curve of a 304 stainless steel has been measured by a tensile test. The material constants for the constitutive model are then found through an inverse analysis of the stress-strain curve measured experimentally, determining the stress-strain relationship equation and the kinetics of twinning and martensitic transformation of the investigated alloy. The volume fractions of martensitic transformation have been measured by the magnetic tester of Fischer Model MP3C. It has been shown that the calculated stress-strain curve and the volume fractions of martensitic transformation are in agreement with those obtained from experimental measurements, demonstrating that the material constants found by using the stress-strain curve can capture the underlying materials science of deformation. On this basis, the influence of twins, martensitic transformation, and mechanical behavior of austenite and martensite on the strength and plasticity of the 304 stainless steel has been discussed further.
마르텐사이트와 오스테나이트의 2상 조직을 갖는 고 Mn 오스테나이트계 스테인리스강의 인장성질
김영화(Young-Hwa Kim),강창룡(Chang-Yong Kang) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.4
The tensile properties of high manganese austenitic stainless steel with the two phase structures of deformation-induced martensite and reversed austenite were studied. Reversed austenite with an ultra-fine grain size of less than 0.3 ㎛ was obtained by reversion treatment. The two phases structures of deformation-induced martensite and reversed austenite were obtained by an annealing treatment in the range of 500℃-700℃ for various times in 70% cold- rolled high-manganese austenitic stainless steel. The volume fraction of the reversed austenite increased rapidly with increases in the annealing temperature and time. In the stainless steel with the two phases of austenite and martensite, the strength decreased rapidly, while the elongation increased slowly and then rapidly increased with an increase in the volume fraction of the reversed austenite. Therefore, the strength and elongation were strongly controlled by the volume fraction of reversed austenite. A good combination of high strength and elongation could be obtained by the mixed structure of reversed austenite and deformation-induced martensite.
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.
오스테나이트계 스테인리스강의 강도 및 감쇠능에 마치는 미세조직의 영향
손동욱(D. U. Son),김재환(J. W. Kim),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The effect of the phases of v, α' and ε martensite, which constitute the structure of the 316L stainless steel with austenite structure at room temperature, on the damping capacity and tensile properties has been investigated. Various fraction of these phases were formed depending on the cold work degree, namely the volume fraction of ε martensite showed maximum value about at 20% cold rolling. while the volume fraction of α' martensite continuously rose according to the increase of cold rolling. The behavior of damping capacity with increasing the degree of cold rolling is the same as that of E martensite. The maximum value of damping capacity showed near at 20% cold rolling formed the largest volume fraction of ε martensite phase. With increasing the volume fraction of α' martensite, tensile strengths increased and elongation decreased due to the increment in the volume fraction of martensite induced by deformation. The damping capacity and elongation is strongly controlled by the volume fraction of E martensite with liner relationship. however, the effect of damping capacity on the volume fraction of α' martensite and austenite phase was not observed. while, tensile strength was controlled by the volume fraction of α' martensite.
권민기,강창룡,Kwoon, Min-Gi,Kang, Chang-Yong 한국재료학회 2014 한국재료학회지 Vol.24 No.1
This study is experimentally investigated whether or not a relationship exists between the mechanical properties and damping capacity of cold-rolled 316 L stainless steel. Deformation-induced martensite was formed with surface relief and directionality. With the increasing degree of deformation, the volume fraction of ${\varepsilon}$-martensite increased, and then decreased, while ${\alpha}^{\prime}$-martensite increased rapidly. With an increasing degree of deformation, tensile strength was increased, and elongation was decreased; however, damping capacity was increased, and then decreased. Tensile strength and elongation were affected in the ${\alpha}^{\prime}$-martensite; hence, damping capacity was influenced greatly by ${\varepsilon}$-martensite. Thus, there was no proportional relationship between strength, elongation, and damping capacity.