Properties and Corrosion Resistance of AISI H13 Hot-Work Tool Steel with Borided B 4 C Powders
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Properties and Corrosion Resistance of AISI H13 Hot‑Work Tool Steel with Borided B4C Powders Ali Günen1 · İsmail Hakki Karahan2 · Mustafa Serdar Karakaş3 · Bülent Kurt4 · Yusuf Kanca5 · Vedat Veli Çay6 · Murat Yıldız7 Received: 12 March 2019 / Accepted: 5 August 2019 © The Korean Institute of Metals and Materials 2019
Abstract In this study, the surface of AISI H13 steel was borided with powder blends of B4C and NaBF4 using the powder-pack method at 800, 900 and 1000 °C for 2, 4 and 6 h. The structural and mechanical characteristics of the boride layers formed on the surface were characterized using scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry, 2D surface profilometry, microhardness and electrochemical corrosion (3.5 wt% NaCl) tests. The boride layer exhibited a single phase structure ( Fe2B) in samples coated at 800 °C and a dual-phase structure (FeB + Fe2B) at higher boriding temperatures (900 and 1000 °C). The boride layers were compact and crack-free in all boriding conditions. Depending on boriding parameters, the thickness, hardness and average surface roughness (Ra) of the coatings were found to range between 5.81 and 102.46 µm, 1635–1915 HV and 0.315–0.650 µm, respectively. The borided AISI H13 steel displayed up to 33.5 times and 2.4 times higher corrosion resistance than untreated AISI H13 steel and martensitic AISI 431 steel, respectively. This suggests potential use of borided AISI H13 steel in the steam turbines and marine applications as an alternative to the more costly martensitic and duplex stainless steel grades. The corrosion resistance depended on the phase structure (single- or dual-layer), density, thickness and surface roughness of the boride coatings. Keywords Steel · Boriding · Corrosion · NaCl
1 Introduction * Ali Günen [email protected]; [email protected] 1
Department of Metallurgy and Materials Engineering, Faculty of Engineering and Natural Sciences, Iskenderun Technical University, 31200 Hatay, Turkey
2
Department of Physics, Faculty of Science and Arts, Mustafa Kemal University, 3100 Hatay, Turkey
3
Department of Metallurgical and Materials Engineering, Faculty of Engineering and Natural Sciences, Konya Technical University, 42130 Konya, Turkey
4
Department of Materials Engineering, Faculty of Engineering and Architecture, Nevşehir Hacı Bektaş Veli University, 50000 Nevşehir, Turkey
5
Department of Mechanical Engineering, Faculty of Engineering, Hitit University, 19030 Çorum, Turkey
6
School of Civil Aviation, Dicle University, 21280 Diyarbakir, Turkey
7
Department of Mechanical Engineering, Faculty of Engineering and Natural Sciences, Iskenderun Technical University, 31200 Hatay, Turkey
The tailorable mechanical properties of steels have enabled them to become the most widely used material group in the industry [1, 2]. However, issues such as corrosion and wear under extreme service conditions often restrict their service life [3, 4] and cause vital economic losses. Since corrosion and wear events g
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