Production of High-Density Materials from Ni-Based IN 625 and IN 718 Superalloy Powders by Direct Metal Laser Sintering Method

Öz

Today, various techniques are used for rapid prototyping of metal parts for various application areas and to enable them to reach the market faster. Direct Metal Laser Sintering (DMLS) of powder materials is one of the most promising topics for research and development in this field. The main advantage of these methods is the ability to produce very complex shaped parts layer by layer in a very short time using CAD data, without the need for any molds. This study aims to produce high-density parts using the DMLS method, one of the rapid prototyping methods. For this purpose, part production was carried out by changing the production parameters, powder size, and properties. Inconel 625 and Inconel 718 powders, which are Ni-based materials, were used in the experiments. As a result of the experimental studies, while difficulties were encountered in obtaining high-density materials with laser sintering, especially when using fine powder particles below 20 microns, it was possible to produce materials with higher densities in powders below 53 microns using appropriate parameters. The aim of this study is to produce high-density superalloy parts using the DMLS method, depending on particle size and production parameters, and to achieve a density of 90% or higher after a single-stage addition sintering process. 

Anahtar Kelimeler

• Selective laser sintering
• IN 718
• IN 625 powders
• Laser speed and laser power
• Hatch distance

Destekleyen Kurum

Turkish State Planning Organisation

Proje Numarası

2003 K 120470-11

Etik Beyan

The author of this article declares that the materials and methods they use in their work do not require ethical committee approval and/or legal-specific permission.

Teşekkür

Thanks to Fraunhofer IFAM/Bremen

Doğrudan Metal Lazer Sinterleme Yöntemi ile Ni Esaslı IN 625 ve IN 718 Süperalaşım Tozlarından Yüksek Yoğunluklu Malzeme Üretimi

Öz

Günümüzde çeşitli uygulama alanları için metal parçaların hızlı prototiplemesi ve pazara daha hızlı ulaşabilmesi amacıyla çeşitli teknikler kullanılmaktadır. Toz malzemelerin Doğrudan Metal Lazer Sinterleme (DMLS) yöntemi bu alandaki araştırma ve geliştirme için en umut vadeden konulardan biridir. Özellikle çok karmaşık şekilli parçaların CAD verileri kullanılarak çok kısa sürede herhangi bir kalıba ihtiyaç duymadan katman katman üretilebilmesi, bu yöntemlerin ana avantajıdır. Bu çalışmada hızlı prototipleme yöntemlerinden biri olan DMLS yöntemi kullanılarak yüksek yoğunluklu parça üretimi amaçlanmıştır. Bu amaçla üretim parametreleri ve toz boyut ve özellikleri değiştirilerek parça üretimi gerçekleştirilmiştir. Deneylerde Ni esaslı IN 718 ve IN 625 tozları kullanılmıştır. Deneysel çalışmalar sonucunda, özellikle 20 mikron altı ince toz parçacıkları ile yapılan lazer sinterlemede yüksek yoğunluklu malzeme elde etmede zorluklar yaşanırken, uygun parametrelerle 53 mikron altı tozlarda daha yüksek yoğunluklarda malzeme üretimi mümkün olmuştur. Çalışmanın amacı, toz boyutu ve üretim parametrelerine bağlı olarak yüksek yoğunluklu süperalaşım parçaları DMLS yöntemiyle üretmek ve tek aşamalı ilave sinterleme işlemi sonrasında %90 ve üzeri yoğunluğa ulaşmaktır. 

Anahtar Kelimeler

• Seçici lazer sinterleme
• IN 718 ve IN 625 tozları
• Laser hızı ve gücü etkisi
• Lazerlerarası mesafe etkisi

Destekleyen Kurum

Kalkınma Bakanlığı

Proje Numarası

2003 K 120470-11

Etik Beyan

Bu makalenin yazarı çalışmalarında kullandıkları materyal ve yöntemlerin etik kurul izni ve/veya yasal-özel bir izin gerektirmediğini beyan ederler.

Teşekkür

Fraunhofer IFAM’a (Bremen-Almanya) teşekkür eder.

Kaynakça

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