The Fracture Toughness of Fe2B Formed on Boronized AISI 304

Polat Topuz; Emine Gündoğdu; Eren Yılmaz; Emre Gümüş

doi:10.3139/120.110621

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The Fracture Toughness of Fe₂B Formed on Boronized AISI 304

Polat Topuz , Emine Gündoğdu , Eren Yılmaz und Emre Gümüş

Veröffentlicht/Copyright: 28. September 2014

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Aus der Zeitschrift Materials Testing Band 56 Heft 9

Abstract

In this study, the fracture toughness of Fe₂B boride layer on boronized AISI 304 stainless steel was investigated. Samples were boronized in an indirect heated fluidized bed furnace with Ekabor 1™ boronizing agent at 1123 K, 1223 K, and 1323 K for 1 h, 2 h, and 4 h, respectively. The boride phases were investigated by X-ray diffraction (XRD) analysis. Hardness and fracture toughness of borides were measured via Vickers indentation. With increasing boriding temperature and time the fracture toughness values were reduced. The boride layer thickness formed on the boronized samples ranged between 12 μm and 176 μm. The hardness of the borides ranged between 1709 HV_0.1 and 2119 HV_0.1 and fracture toughness was in the range of 2.19–4.47 MPa × m^1/2 depending on the layer thickness and hardness.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurde die Bruchzähigkeit einer Fe₂B-Schicht auf einem borierten hochlegierten austenitschen Stahl AISI 304 untersucht. Hierzu wurden Proben in einem indirekt erwärmten Flüssigkeitsbettofen bei 1123 K, 1223 K, 1323 K für 1 h, 2 h, bzw. 4 h erwärmt, der das Boriermittel Ekabor 1™ enthielt. Die Boridphasen wurden mittels Röntgenbeugung (XRD) analysiert. Die Härte und die Bruchzähigkeit wurden mittels Vickers-Härteprüfgerät gemessen. Mit zunehmender Boriertemperatur und -zeit nahmen die Bruchzähigkeitswerte ab. Die Dicke der Boridschicht auf den borierten Proben betrug zwischen 12 μm und 176 μm. Die Härte der Boride betrug zwischen 1709 HV_0,1 und 2119 HV_0,1 und die Bruchzähigkeit lag in dem Bereich 2,19–4,47 MPa × m^1/2, abhängig von der Schichtdicke und der Härte.

*Correspondence Address Assistant Prof. Dr. Polat Topuz Gedik University Sülüntepe Mh. Yunus Emre Cd. No. 1/1 34913 Pendik İstanbul, Turkey E-mail: polat.topuz@gedik.edu.tr

Assistant Prof. Dr. Polat Topuz, born in 1975, graduated at the Marmara University, Turkey in the Technical Education Faculty. He completed his MSc and PhD at the same university. He worked at the Yildiz Technical University, Turkey in the Metallurgy and Material Department between 1999 and 2010. He has been working at the Gedik University, Turkey in the Gedik Vocational School since 2010. He is an expert in materials science, destructive and non-destructive material tests, scanning electron microscopy, and diffusion.

Instructor Emine Gündogdu, born in 1984, graduated at the Gazi University, Turkey in the Technical Education Faculty. She completed her MSc at the same university and her PhD education continues. She has been working at the Gedik University, Turkey in the Gedik Vocational School since 2011. She is welding engineer and an expert in welding technology, plastic forming, and powder metallurgy.

Instructor Eren Yilmaz, born in 1983, graduated at the Sakarya University, Turkey in the Engineering Faculty, Metallurgy and Material Engineering Department. He completed his MSc at the same university and his PhD education in the same department continues. He has been working at the Gedik University, Turkey in the Gedik Vocational School since 2011. He is welding engineer and an expert in welding technology, non-destructive materials testing, and heat treatment.

Instructor Emre Gümüs, born in 1987, graduated at the Yildiz Technical University, Turkey in the Faculty of Chemical and Metallurgical Enginnering, Metallurgy and Material Engineering Department. He completed his MSc at the same university and his PhD education continues. He has been working at the Gedik University, Turkey in the Gedik Vocational School since 2013. He is an expert in composite materials, tribology, occupational health, and safety.

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Published Online: 2014-09-28

Published in Print: 2014-09-01

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https://doi.org/10.3139/120.110621