Effect of adding support structures for overhanging part on fatigue strength in selective laser melting

被引：48

作者：

Kajima, Yuka ^{[1
]}

Takaichi, Atsushi ^{[1
]}

Nakamoto, Takayuki ^{[2
]}

Kimura, Takahiro ^{[2
]}

Kittikundecha, Nuttaphon ^{[1
]}

Tsutsumi, Yusuke ^{[3
]}

Nomura, Naoyuki ^{[4
]}

Kawasaki, Akira ^{[4
]}

Takahashi, Hidekazu ^{[5
]}

Hanawa, Takao ^{[3
]}

Wakabayashi, Noriyuki ^{[1
]}

机构：

[1] Tokyo Med & Dent Univ, Grad Sch Med & Dent Sci, Removable Partial Prosthodont, Oral Hlth Sci,Bunkyo Ku, 1-5-45 Yushima, Tokyo 1138549, Japan

[2] Osaka Res Inst Ind Sci & Technol, Izumi Ctr, Res Div Machining & Molding, 2-7-1 Ayumino, Izumi, Osaka 5941157, Japan

[3] Tokyo Med & Dent Univ, Inst Biomat & Bioengn, Metall Biomat, Biomed Mat,Chiyoda Ku, 2-3-10 Kanda Surugadai, Tokyo 1010062, Japan

[4] Tohoku Univ, Met Mat Sci & Mat Proc, Grad Sch Engn, Aoba Ku, 6-6-02 Aramaki Aza Aoba, Sendai, Miyagi 9808579, Japan

[5] Tokyo Med & Dent Univ, Dept Oral Biomat Engn, Grad Sch Med & Dent Sci, Bunkyo Ku, 1-5-45 Yushima, Tokyo 1138549, Japan

来源：

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS | 2018年 / 78卷

关键词：

Selective laser melting; Fatigue strength; Support structure; Clasp; Co-Cr-Mo alloy; Finite element simulation; REMOVABLE PARTIAL DENTURES; FINITE-ELEMENT SIMULATION; CO-CR; MECHANICAL-PROPERTIES; CRACK-PROPAGATION; HEAT-TREATMENT; INCONEL; 718; BEHAVIOR; DESIGN; POWDER;

D O I：

10.1016/j.jmbbm.2017.11.009

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

Selective laser melting (SLM) technology was recently introduced to fabricate dental prostheses. However, the fatigue strength of clasps in removable partial dentures prepared by SLM still requires improvement. In this study, we attempted to improve the fatigue strength of clasps by adding support structures for overhanging parts, which can generally be manufactured at an angle to be self-supporting. The results show that the fatigue strength of the supported specimens was more than twice that of unsupported specimens. Electron back-scattered diffraction analysis revealed that the supported specimens exhibited lower kernel average misorientation values than the unsupported specimens, which suggested that the support structure reduced the residual strain during the SLM process and helped to prevent micro-cracks led by thermal distortion. In addition, the supported specimens cooled more rapidly, thereby forming a finer grain size compared to that of the unsupported specimens, which contributed to improving the fatigue strength. The results of this study suggest that the fatigue strength of overhanging parts can be improved by intentionally adding support structures.

引用

页码：1 / 9

页数：9

共 46 条

[1] Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality [J].