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- W4384208148 abstract "본 연구에서는 우수한 생체적합성과 부식저항성 그리고 기계적 특성을 갖는 Ti6Al4V 합금을 선택적 레이저 용융(selective laser melting; SLM)법을 이용하여 시편을 제조하였다(Ti6Al4V-AS군). 이 시편들을 진공전기로를 이용하여 950℃와 550℃에서 열처리를 수행하였다(Ti6Al4V-HT군). 열처리 전후 합금 시편들의 기계적 특성, 금속 조직 형상, 결정구조 및 화학적 특성을 분석하였다. Ti6Al4V-AS 합금은 높은 항복강도와 낮은 연신율 값을 보여주었다. 금속 조직 이미지에서 침상의 결정립들이 관찰되었으며, 결정구조 분석 결과 α′-Ti 상이 지배적이었다. 열처리를 수행한 Ti6Al4V-HT 합금은 항복강도 값이 낮아지고 연신율은 증가하였다. 또한 주상 형의 결정립들이 배열된 층상 구조의 조직이 관찰되었으며, α+β-Ti 상이 형성되었고, 결정성은 증가하였다. 각 시편들의 화학적 조성을 분석한 결과, Ti6Al4V-AS 시편이 Ti6Al4V-HT 시편에 비하여 높은 탄소의 함량을 함유하고 있었으며, 이 탄소의 함량이 Ti6Al4V-AS 시편의 α′- 상의 형성과 높은 강도와 및 낮은 연신율에 영향을 미치는 것으로 해석되었다. Ti6Al4V-HT 시편의 경우 전체적인 탄소의 함량은 낮았지만, 국소적으로 α-상 영역에 탄소의 함량이 높았다. 따라서 SLM법을 이용한 Ti6Al4V 시편 제조 시 탄소 가스의 혼입을 효과적으로 제어할 필요가 있음을 알 수 있었다. In this study, the Ti6Al4V specimens were fabricated using selective laser melting (SLM) method (Ti6Al4V-AS group). These specimens were performed to heat treatment at 950℃ and 550℃ using vacuum electric furnace (Ti6Al4V-HT group). The mechanical properties, metallographic shape, crystalline structure, and chemical compositions of the alloy specimens before and after heat treatment were analyzed. The Ti6Al4V-AS group showed ultimate tensile strength (UTS) and low elongation values. Acicular crystal grains were observed in metallographic image and the α-Ti phase was dominant. After heat treatment (Ti6Al4V-HT group), the UTS was lowered and the elongation was increased. In addition, a lamellar structure in which columnar crystal grains are arranged was observed, α+β-Ti phase was formed, and crystallinity increased. As a result of analyzing the chemical composition, the Ti6Al4V-AS specimen contained a higher carbon content than the Ti6Al4V-HT specimen. This high carbon content could be related to the formation of α-phase, high strength and low elongation of the Ti6Al4V-AS specimen. Ti6Al4V-HT specimen showed that the overall carbon content was low, but the carbon content was locally high in the α-Ti phase region. Therefore, it is necessary to control effectively the incorporation of carbon gas in the production of Ti6Al4V specimens using SLM." @default.
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- W4384208148 date "2023-06-30" @default.
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- W4384208148 title "The effect of heat treatment of the TI6AL4V specimen fabricated by selective laser melting method on the crystalline structure and chemical compositions" @default.
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