Effect of solution heat treatment on the microstructure and crystallographic texture of IN939 fabricated by powder bed fusion-laser beam

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2023

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Elsevier

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Metallurgical and Materials Engineering
(2004)
The main fields of operation for Metallurgical and Materials Engineering are production of engineering materials, defining and improving their features, as well as developing new materials to meet the expectations at every aspect of life and the users from these aspects. Founded in 2004 and graduated its 10th-semester alumni in 2018, our Department also obtained MÜDEK accreditation in the latter year. Offering the opportunity to hold an internationally valid diploma through the accreditation in question, our Department has highly qualified and experienced Academic Staff. Many of the courses offered at our Department are supported with various practice sessions, and internship studies in summer. This way, we help our students become better-equipped engineers for their future professional lives. With the Cooperative Education curriculum that entered into effect in 2019, students may volunteer to work at contracted companies for a period of six months with no extensions to their period of study.
Organizational Unit
Department of Metallurgical and Materials Engineering
Metalurji ve Malzeme Mühendisliğinin alanı çok geniştir ve temel olarak metaller, seramikler, polimerler ve bu üç malzemenin birlikte oluşturdukları kompozit malzemelerin üretimlerini, şekillendirilmelerini, işlemlerini, karakterizasyonlarını ve kullanımlarındaki davranışlarını kapsar. Yüksek Lisans programımızda amacımız, öğrencilerimizin bu konulardan bir veya birkaçında kapsamlı ve derin bir kuramsal ve uygulamalı bilgi birikimine sahip olmaları ve bilgiye ulaşma, ulaşılan bilgileri değerlendirme, deney tasarlama, deney sonuçlarını analiz etme ve raporlama yeteneklerini kazanmalarıdır. Web sayfamızda yer alan bilgilerden de görülebileceği gibi modern cihaz ve ekipmanla donatılmış güçlü laboratuvar altyapımız çok farklı konularda araştırma yapılmasını olanaklı kılmaktadır. Yüksek Lisans müfredatımızda Malzemelerin İleri Termodinamiği, Malzeme Mühendisliğinde Matematiksel Yöntemler ve Malzeme-Süreç Seçimi ve Tasarım Problemleri isimli üç zorunlu ders yer almaktadır. Tezli Yüksek Lisans programımız bu zorunlu derslerin yanında zorunlu olan Seminer, Yüksek Lisans Tezi ve dört teknik seçmeli dersten, Tezsiz Yüksek Lisans programımız ise zorunlu olan Bitirme Projesi ve 7 teknik seçmeli dersten oluşmaktadır. Teknik seçmeli dersler tez danışmanının onayı dâhilinde çok sayıdaki teknik seçmeli ders arasından seçilmektedir. Programımıza Metalurji ve Malzeme Mühendisliği mezunlarının yanısıra diğer Mühendislik Bölümleri ile Fizik, Kimya vb. bölümlerin mezunları da kabul edilebilmektedir. Bu bölümlerden mezun olan adayların, her birinin akademik ve profesyonel birikimlerine göre belirlenecek bir bilimsel hazırlık programını tamamlamaları gerekmektedir.

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Abstract

The effect of various solution heat treatment temperatures (i.e., 1120, 1160, 1200 and 1240 & DEG;C) on the microstructure, grain morphology and crystallographic texture of IN939 fabricated by powder bed fusion-laser beam (PBF-LB) was investigated. Microstructural analyses showed that the high-temperature gradient and rapid solidification of the PBF-LB processing caused different resulting microstructures compared to conventionally pro-duced counterparts. The melt pool morphologies and laser scanning paths were examined in the as-fabricated samples in the XZ-and XY-planes, respectively. After the application of solution heat treatment at 1120 & DEG;C, the as-fabricated PBF-LB initial microstructure was still apparent. For solution heat treatments of 1200 & DEG;C and above, the melt pool and scanning path morphologies disappeared and converted into a mixture of columnar grains in the XZ-plane and equiaxed grains in the XY-plane. On the other hand, large equiaxed grains were observed when the samples were solutionized at 1240 & DEG;C. Additionally, g' phase precipitated within the matrix after all solution heat treatment conditions, which led to increase in the microhardness values. According to electron backscatter diffraction (EBSD) analyses, both as-fabricated and solution heat-treated samples had intense texture with {001} plane normal parallel to the building direction. The first recrystallized grains began to appear when the samples were subjected to the solution heat treatment at 1160 & DEG;C and the fraction of the recrystallized grains increased with increasing temperature, as supported by kernel average misorientation (KAM) and grain spread orientation (GOS) analyses.& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Brabazon, Dermot/0000-0003-3214-6381

Keywords

Solution heat treatment, PBF-LB, IN939, Microstructure, Texture, Recrystallization

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5

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Volume

24

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Start Page

8909

End Page

8923

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