The effect of heat treatment of the TI6AL4V specimen fabricated by selective laser melting method on the crystalline structure and chemical compositions
10.14815/kjdm.2023.50.2.99
- Author:
Ho-Jun SONG
1
;
Yeong-Joon PARK
;
Won-Jin MOON
;
Wan-Gil JUNG
;
Seon-Shin CHO
;
Byeong-Mo KANG
;
Taek-Rim YOON
Author Information
1. Department of Dental Materials and Dental Materials Research Institute, School of Dentistry, Chonnam National University, Gwangju, Korea
- Publication Type:Original Article
- From:
Korean Journal of Dental Materials
2023;50(2):99-108
- CountryRepublic of Korea
- Language:English
-
Abstract:
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.
