Investigation of the Joinability of SX Steel by Diffusion Welding Method Using Different Interlayers

Year 2024, Volume: 15 Issue: 3, 641 - 652, 30.09.2024

Jiyan Güney , M. Selçuk Keskin , Haluk Kejanlı

https://doi.org/10.24012/dumf.1490715

Abstract

SX steels, a type of stainless steel enriched with high silicon content, are frequently used in critical applications of the industry due to their resistance to many acids. Areas of use are acid tanks, acid coolers, acid pipe systems and acid radiators. Increasing areas of use have increased the need to combine with different materials. This study aimed to join the different layers by diffusion welding method using Cu, Ni, Al7072 and Al8079. The samples were combined by keeping them under 5MPa pressure for 60 minutes at 1000 °C in an argon gas environment. Phase changes occurring in the junction area due to the effect of different interlayers were tried to be determined by SEM-EDS and XRD analyses. The changing metallographic structure of the intermediate layers was examined using an optical microscope, and the microhardness change of the joining region was determined with the HV hardness measuring device. While alpha-ferrite structure was observed in the Cu interlayered connections in the samples, multiphase structures were observed in the Al7072 and SX-Al8079 interconnected samples, and the presence of intermetallic phases was detected in both the interface and diffusion zones in the Ni interlayered samples.

Keywords

SX steel, interlayer, diffusion welding, microhardness

SX Çeliğinin Farklı Aratabaka Kullanılarak Difüzyon Kaynak Yöntemi ile Birleştirilebilirliğinin Araştırılması

Abstract

Yüksek silisyum içeriği ile zenginleştirilmiş bir paslanmaz çelik türü olan SX çelikleri, birçok asitlere karşı dayanıklılığı nedeniyle endüstrinin kritik uygulamalarında sıklıkla kullanılmaktadır. Kullanım alanları asit tankları, asit soğutucuları, asit boru sistemleri ve asit radyatörleridir. Kullanım alanlarının artması, farklı malzemelerle birleştirilme ihtiyacını da arttırmıştır. Bu çalışmada Cu, Ni, Al7072 ve Al8079 kullanılarak farklı katmanların difüzyon kaynağı yöntemiyle birleştirilmesi amaçlandı. Numuneler argon gazı ortamında 1000 °C'de 60 dakika 5MPa basınç altında tutularak birleştirildi. Farklı ara katmanların etkisiyle birleşim bölgesinde meydana gelen faz değişiklikleri SEM-EDS ve XRD analizleri ile belirlenmeye çalışılmıştır. Ara katmanların değişen metalografik yapısı optik mikroskop kullanılarak incelendi ve birleştirme bölgesinin mikrosertlik değişimi HV sertlik ölçüm cihazı ile belirlendi. Örneklerde Cu arakatmanlı bağlantılarda alfa-ferrit yapısı gözlenirken, Al7072 ve SX-Al8079 birbirine bağlı numunelerde çok fazlı yapılar gözlenirken, Ni arakatmanlı numunelerde hem arayüz hem de difüzyon bölgelerinde intermetalik fazların varlığı tespit edildi.

Keywords

SX çeliği, difüzyon kaynağı, mikro sertlik, Aratabaka

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