Gaz Tungsten Ark Kaynaklı 9Ni Kriyojenik Çelik Bağlantının İçyapı ve Mekanik Özelliklerinin Belirlenmesi**

Year 2022, Volume: 63 Issue: 706, 117 - 137, 10.12.2021

Hüseyin Tarık Serindağ Cemal Tardu İshak Özer Kırçiçek Gürel Çam

https://doi.org/10.46399/muhendismakina.999079

Cited By: 3

Abstract

Sıvılaştırılmış doğal gaza (LNG) olan talebin sürekli artmasına paralel olarak LNG depolama tanklarının imalinde düşük sıcaklıklarda mükemmel tokluk, yüksek süneklik ve çatlama direnci gibi olağanüstü özelliklere sahip olan %9 Ni içerikli çelik levhaların kullanımı da artmaktadır. Bu malzemelerin kaynağında, hem ergime bölgesi hem de ısıdan etkilenen bölge dahil olmak üzere tüm kaynak bölgesinde düşük sıcaklık kırılma tokluğu, kabul edilebilir bir seviyede tutulmalıdır. Bu çalışmada, Ni-bazlı bir dolgu teli kullanılarak gaz tungsten ark kaynağı (GTAK) yapılmış 10 mm kalınlığında %9 Ni içerikli düşük alaşımlı kriyojenik çelik kaynaklı bağlantının kaynak bölgesinde içyapıda meydana gelen değişimler ve mekanik özellikleri sunulacaktır. Kaynak bölgesinde oluşan içyapılar optik mikroskop ile detaylı olarak incelenmiştir. Elde edilen kaynaklı bağlantının mekanik özellikleri ve kaynak performans değerleri çekme deneyi ve mikrosertlik ölçümleri ile belirlenmiştir. Ayrıca, kaynaklı bağlantının -196 °C’deki darbe enerjisi Charpy çentikli darbe deneyi ile tespit edilmiş ve esas levhanın bu sıcaklıktaki kırılma tokluğu ile mukayese edilmiştir.

Keywords

Kriyojenik çelik, 9Ni çelik, Ni-bazlı ilave tel, kırılma tokluğu, darbe enerjisi, ısı girdisi, kaynak performansı.

Thanks

Bu çalışma, TEKFEN İmalat ve Mühendislik A. Ş. tarafından yürütülen 3191473 nolu ‘9 Nikelli Malzeme ile Depolama Tankının Geliştirilmesi’ başlıklı TÜBİTAK-TEYDEB projesi kapsamında yapılmıştır. Bu çalışmanın yürütülmesi için yapmış olduğu finansal destek dolayısıyla TÜBİTAK’a (Türkiye Bilimsel ve Teknolojik Araştırma Kurumu’na) ve TEKFEN İmalat ve Mühendislik A. Ş. Genel Müdürü Sayın Ali Malik ARUN’a ve Genel Md. Yrd. Sayın Mehmet Emin BİLGİN’e teşekkür ederiz. Ayrıca, bu çalışma kapsamında gerçekleştirilen metalografi çalışmaları, mikrosertlik ölçümleri ve mekanik testlerin (çekme ve bükme deneyleri) yapılmasındaki desteklerinden dolayı NOKSEL Çelik Boru Sanayi A.Ş., İskenderun’dan Sedat UYSAL’a (Fabrika Müdürü) ve Tuğrul YAZGAN’a da teşekkürü bir borç biliriz.

Determination of Microstructural and Mechanical Properties of Gas Tungsten Arc Welded 9Ni Cryogenic Steel Joint

Abstract

In parallel to continuously increasing demand for liquefied natural gas (LNG) which is a clean energy source, the use of 9% Ni steel plates is also increasing in the production of LNG storage tanks, due to their outstanding combination of properties such as excellent toughness, high ductility and cracking resistance at very low temperatures. During the welding of this material, low temperature fracture toughness should be kept at an acceptable level within the weld region including both fusion and heat affected zones. This study introduces the result of microstructural evolution in the weld region and the mechanical properties of the gas tungsten arc welded 10 mm thick 9% Ni containing low alloy steel joint produced by using a Ni-based filler wire. The microstructures evolved in the weld region were examined by extensive optical microscopy investigations. Mechanical properties and joint performance values of the welded joints were determined by detailed microhardness measurements and transverse tensile tests. Moreover, impact energy of the joint fabricated was also determined at -196 °C by Charpy impact test (Charpy V-notch test) and compared with the fracture toughness of the base plate at the same temperature.

Keywords

Cryogenic steel, 9% Ni steel, Ni-based filler rod, fracture toughness, impact energy, heat input, weld performance.

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