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Am60 마그네슘 합금의 결정립 미세화에 미치는 탄소접종제 C2Cl6 첨가의 영향
엄정필(Jeong Pil Eom),정승규(Seong Kyu Jeong),임수근(Su Geun Lim),신희택(Hee Taek Shin) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.3
The effects of C₂Cl_6 addition on the grain refinement of AM60 magnesium alloy were investigated. AM60 alloy was melted in the low carbon steel crucible by cylindrical electric furnace under an argon atmosphere. The effects of the C₂Cl_6 were estimated with various inoculation temperatures, inoculation contents, and holding times to find out the optimum conditions. The grain size of AM60 magnesium alloy decreased significantly with an increase in C₂Cl_6 content and, over 0.6 wt% C₂Cl_6 or more, grain size constant at about 94 ㎛. The optimum condition was obtained in the 0.6 wt% C₂C_(16), holding for 30 min. at 740˚C The tensile properties of AM60 magnesium alloys were improved due to grain refinement by the additions of C₂Cl_6 In the optimum condition, the yield strength, tensile strength and elongation were σ_(0.2) = 107 MPa, σ_(T.S) = 231 MPa and e = 1 4%, respectively. The variation of stress with strain obeyed the relationship of the σ= Kε^n. The strain-hardening exponent, n, and strength coefficient, K were n = 0.22 and K = 380 MPa. (Received March 30, 1999)
Mg-Zn-(Mn)-Ca 합금의 미세조직 및 기계적 성질
엄정필,차동득,임수근,허보영 ( Jeong Pil Eom,Dong Deuk Cha,Su Guen Lim,Bo Young Hur ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.6
N/A The microstructure and tensile properties of Mg-Zn-Ca and Mg-Zn-Mn-Ca alloys have been investigated. The alloys were obtained by melting in a low carbon crucible coated with boron nitride under an Ar gas atmosphere to prevent oxidation and combustion. The Mg alloy melt was cast into the metallic mold at room temperature, and cooling part was located at the bottom of mold. The phase formed during solidification of the Mg-Zn-(Mn) alloys containing 0.5%Ca is Ca₂Mg_6Zn₃,. The yield strength and ultimate tensile strength of the alloys increased with increasing Zn content, but the ductility did not change with increasing Zn content. The addition of Mn improves the yield strength and ultimate tensile strength of the alloys, but the ductility did not change. Tensile fracture of the alloys revealed brittle failure, with cracking along the Ca₂Mg_6Zn₃, phase. The variation of stress with strain obeyed the relationship of the σ=Kε. (Received October 21, 1997)
CaCN2 첨가에 의한 AM60 마그네슘 합금의 결정립 미세화 및 기계적 성질
엄정필,정승규,임수근,신희택,정득수 ( Jeong Pil Eom,Seong Kyu Jeong,Su Geun Lim,Hee Taek Shin,Deuk Soo Jeong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.4
N/A Effects of CaCN₂ addition on the grain refinement in the AM60 magnesium ingots were investigated. The effects of the CaCN₂ are estimated with different inoculation temperatures, inoculation contents, and holding time to find out the optimum condition. AM60 alloy was melted in the low carbon steel crucible by cylindrical electric furnace under an argon atmosphere. The melting and casting apparatus is specially designed for magnesium alloys. The grain size of AM60 magnesium alloy decreased significantly with an increase in CaCN₂ content and, at 0.8 wt% CaCN₂ or more, grain size becomes constant at about 85 ㎛. The optimum condition was obtained in the 0.8 wt% CaCN₂ for holding molten metal of 30 min. at the temperature of 710˚C. The tensile properties of AM60 magnesium alloys were improved due to grain refinement by addition of CaCN₂. In the optimum condition, the yield strength, tensile strength and elongation were σ_(0.2)= 107 MPa, σ_(T.S)=234 MPa and e=14.2%. The variation of stress with strain obeyed the relationship of the σ= Kε^n. The strain-hardening exponent, n and strength coefficient, K obtained in the 0.8 wt% CaCN₂ added AM 60 magnesium alloy were n=0.21 and K=390 MPa. (Received May 28, 1998)
Ar 가스 분위기에서 제조한 Mg-Zn-(Mn) 합금의 미세조직
엄정필,임수근,허보영 ( Jeong Pil Eom,Su Guen Lim,Bo Young Hur ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.4
N/A The microstructure of Mg-1∼6wt%Zn, Mg-1.5wt%Mn and Mg-3,6wt%Zn-lwt%Mn alloys were investigated by means of optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. The liquid Mg alloys were tasted into the metallic mold at room temperature, and cooling part was located at the bottom of mold. The microstructure of Mg-Zn cast alloys revealed that MgZn compounds were around the secondary dendrite arms. Scanning electron microscopy and energy dispersive spectroscopy showed that the composition of MgZn compound was Mg-77wt%Zn. The addition of Mn in Mg-Zn alloys refined the grain size in as tasted alloys. Manganese additions also increased the Vickers hardness.
장성철(Jang Sung-Cheol),엄정필(Eom Jeong-Pil),정현철(Jung Hyun-Cheol) 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.5
By using an ANSYS product suite (CFX, Ansys Multiphysics), which is a powerful tool for multiphysics analysis of complicated physical phenomena, we performed a structural stress analysis based on fluid flow and heat transfer phenomena within a quick connect/disconnect (QC/DC) bellows system. Considering the extremely low temperatures in the QC/DC environment, an approach to the problem based on complex multi-physics phenomena, where different phenomena interact with each other, is crucial. Therefore, we use a numerical analysis technique where fluid-thermal-structural interactions are combined. In conclusion, when low temperature fluids flow inside bellows, the expected service life is conspicuously reduced due to the thermal stress caused by heat transfer. Therefore, in future research, a structure with considerably reduced thermal stress by robust design optimization will be derived.
AZ31 마그네슘합금의 결정립 미세화 및 기계적 특성에 미치는 Ca 첨가의 영향
김청림 ( Kim Cheong Lim ),엄정필 ( Eom Jeong Pil ),임수근 ( Im Su Geun ),박원욱 ( Park Won Ug ),유봉선 ( Yu Bong Seon ) 한국주조공학회 2003 한국주조공학회지 Vol.23 No.5
N/A Effects of Ca addition on grain refinement, microstructure and mechanical properties of AZ31 Mg alloy were investigated. Due to Ca addition to Mg alloy (AZ31), the microstructure was refined, the quantity of Mg_(17)Al_(12) phase was reduced, and new Al₂Ca phase was formed. The tensile property of AZ31 was increased with the minor addition of Ca, but was decreased rapidly over 0.2 wt.% of Ca content. The AL₂Ca phase was considered to be detrimental to the mechanical property of AZ31 Mg alloy.