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AOD공정으로 재활용된 니켈합금의 산소주입량에 따른 조직과 기계적 성질 변화
이덕희,우기도,강황진,윤진호,Lee, Duk-Hee,Woo, Kee-Do,Kang, Whang-Jin,Yoon, Jin-Ho 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.2
본 연구에서는 Inconel 713C 스크랩을 원료로 아르곤-산소 탈탄 공정을 이용하여 니켈계 초내열합금을 재활용 하였다. 아르곤-산소 탈탄 공정에서 아르곤은 1,000 sccm으로 지속적으로 주입되었고 산소는 100, 250, 500 sccm의 유량으로 10, 20, 30 분씩 주입되었다. 산소 주입 초기 단계에서는 산소 양이 증가하면서 Al, Cr, 및 Mo 함량은 증가하였고 탄소 함량은 감소하였다. 그리고 Al 함유량은 탄소의 반응이 끝난 후 Al, Cr 등의 원소와 산화가 일어났기 때문에 첨가원소와 탄소의 반응에 의해 감소하였다. 결과적으로, Al 함유량이 감소하였기 때문에 ${\gamma}^{\prime}$상이 줄어들었으며 이는 Al이 ${\gamma}^{\prime}$을 형성하는 주요 원소이기 때문이다. 또한, 탄소의 양이 줄어들면서 탄화물도 줄어들었으며 산소가 과잉 공급된 시료의 기계적인 물성(강도, 경도 등)은 감소하게 된다. In this study, the Ni base superalloy was recycled by Argon oxygen decarburization(AOD) process using an inconel 713C scrap. During AOD process, argon gas was continuously injected 1,000 sccm and oxygen gas was injected into 10, 20 and 30 minutes of 100, 250 and 500 sccm.. In early stage of oxygen injection, the oxygen dose increased with increasing Al, Cr, and Mo content and decreasing C content. And Al content was decreased by carburization with added elements in late stage Because of oxidation was occurred with Al, Cr etc. after the reaction of carbon has been finished. From the results, the ratio of ${\gamma}^{\prime}$ phase reduced due to decreasing of Al content for that reason Al is the main element to form the ${\gamma}^{\prime}$ phase. Also carbide reduced owing to decreasing of C content so the mechanical properties of the specimens excessively injected by excess $O_2$ gas were decreased.
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생체재료용 Ti-Nb-Si합금의 미세조직과 기계적 성질
김한솔 ( Han Sol Kim ),여인동 ( In Dong Yeo ),김원용 ( Won Yong Kim ),조대형 ( Dae Hyung Cho ),임성환 ( Sung Hwan Lim ),문민석 ( Min Seok Moon ),강황진 ( Whang Jin Kang ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.6
We report on advanced β-titanium alloys having excellent biocompatibility without containing V or Al that has been known as a toxic element for human body, and on a low elastic modulus to be used in the fields of artificial joint and dental implant in the replacement of natural human bone. Ternary Ti-Nb-Si alloys consisting of biocompatible alloying elements have been produced to investigate the alloying effect on microstructure, elastic modulus and mechanical properties. On the basis of experimental results obtained, it is suggested that Si has an effective role to suppress the formation of ω-phase leading to reduction in elastic modulus.
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一方向凝固시킨 Al-Cu-Mg共晶合金의 機械的 性質에 미치는 時效의 影響
趙顯驥,康晃鎭,趙美子 慶北大學校 1982 論文集 Vol.33 No.-
The microstructure and mechanical properties of unidirectionally solidified Al-Cu-Mg eutectic alloys have been studied in as-grown and aged condition. After unidirectionally solidification, specimens of solution treated and quenched eutectic were at 180°, 230°, 260℃ in a salt bath for various time. The results obtained are as follows; 1) Precipitation on hardening of the ductile phase is a feasible mechanism for strengthening of composites. 2) Mechanical Testing of the tenary eutectic has shown that composite is strengthened about 30 to 50% by ageing. 3) Tensile and compression strength of this composites are 25 and 70kg/㎟ by ageing treatment in growth 0.1mm/min. 4) The unidirectionally solidified structure are changed by ageing. It seems that the low Cu and Mg solute atoms are likely due to epitaxial precipitation onto CuAl_2 lamellar respectively.
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Al-Cu-Mg 공결합금의 일방향응고 조직과 기계적 성질
조현기,이기대,강황진 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.10
Unidirectional solidification experiments were conducted on Al-Cu-Mg ternary eutectic alloys to investigate the effects of the growth rate and (Cu+Mg)/(Al+Cu+Mg) ratio on the composites structure and the mechanical properties at temperature gradient 80℃/㎝ in the range of crystal growth rate from 0.1 to 1.2 ㎜/min. The results indicated that lamellar composite structure and colony structure are formed in the range of growth rate 0,1∼0.3 ㎜/min. and 0.6∼1.2 ㎜/min., respectively. The scale of phases varies as the growth rate to the negative one-half power and λ²R was 8.5 ×10^(-6) ㎣/min. The faster growth and he higher (Cu+Mg) wt.% in the range below 40.3 wt.% cause the higher mechanical strength. Failure in tension of these alloys initiates from crack formed by loading and is describable by Griffith brittle-fracture theory.
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