Investigation of Compatibility Between Design and Additively Manufactured Parts of Functionally Graded Porous Structures

Year 2022, , 1069 - 1082, 01.10.2022

Ahmet Murat Dursun Mehmet Çağrı Tüzemen , Elmas Salamcı , Oğuzhan Yılmaz , Rahmi Ünal

https://doi.org/10.2339/politeknik.891080

Cited By: 2

Abstract

In this study, deviations for the porosity level of the Ti-6Al-4V functionally graded porous structures for three different cell structures were investigated. For this purpose, functionally graded porous structures are designed and produced by selective laser melting (SLM). It is also aimed to investigate the effects of unit cell structure, unit cell size, and column (strut) thickness on the porosity deviation level. The specimens were scanned at micro-computed tomography (micro-CT) to determine the structure dimensions after production. According to the results obtained from micro-CT, an average increase of 150-300 μm was observed on the column thicknesses of all functionally graded porous structures. It has been observed that the horizontal columns of cubic and octagonal structures have sagging due to metal melting during production. It has been determined that the porosity of the manufactured parts was deviated between 5.71%-10.54% for cubic, 8.59%-12.39% for octahedroid, and 13%-16.49% for diamond structures compared to the design values.

Keywords

Additive manufacturing, porosity, functionally graded structure, micro-CT

Supporting Institution

TÜBİTAK

Project Number

MAG-116R021

Thanks

This work was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) [grant number MAG-116R021].

İşlevsel Geçişli Gözenekli Yapıların Tasarımı ve Eklemeli Üretilen Parçalar Arasındaki Uyumluluğun Araştırılması

Abstract

Bu çalışmada, Ti-6Al-4V geçişli gözenekli yapıların üç farklı birim hücre yapısı için gözeneklilik oranlarındaki sapmalar araştırılmıştır. Bu amaçla, işlevsel geçişli hücresel yapılar tasarlanmış ve seçici lazer ergitme yöntemiyle üretilmiştir. Ayrıca birim hücre yapısının, birim hücre boyutunun ve kolon (dikme) kalınlığının gözenek boyutlarındaki sapma seviyesi üzerindeki etkilerinin araştırılması amaçlanmıştır. Numuneler, üretim sonrası yapı boyutunu belirlemek için mikro bilgisayarlı tomografide (mikro-BT) taranmıştır. Mikro-BT'den elde edilen sonuçlara göre, geçişli gözenekli tüm hücre yapılarının kolon kalınlık değerlerinde ortalama 150-300 μm arasında değişen artışlar gözlenmiştir. Kübik ve sekizyüzlü yapıların yatay kolonlarında üretim sırasında ergiyen metal sebebiyle sarkmalar oluştuğu gözlenmiştir. Üretilen parçaların gözenekliliği, tasarım değerleri ile karşılaştırıldığında kübik yapıda %5.71-%10.54, sekizyüzlü yapıda %8.59-12.39 ve elmas yapıda %13-16.49 aralıklarında değişen oranlarda sapmaların oluştuğu tespit edilmiştir.

Keywords

Eklemeli üretim, gözeneklilik, işlevsel basamaklandırılmış yapı, mikro-BT

Project Number

MAG-116R021

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