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KMID : 1035320230500020099
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Korean Society for Dental Materials
2023 Volume.50 No. 2 p.99 ~ p.108
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The effect of heat treatment of the TI6AL4V specimen fabricated by selective laser melting method on the crystalline structure and chemical compositions
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Song Ho-Jun
Park Yeong-Joon
Moon Won-Jin
Jung Wan-Gil
Cho Seon-Shin
Kang Byeong-Mo
Yoon Taek-Rim
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Abstract
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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.
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KEYWORD
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Selective laser meting, Ti6Al4V alloy, 3D printer, Crystalline structure, Chemical composition
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