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Wear Resistant Duplex Stainless Steels Produced by Spray Forming
Juliano Soyama,Thiago Pama Lopes,Guilherme Zepon,Claudio Shyinti Kiminami,Walter José Botta,Claudemiro Bolfarini 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
In this work, boron-modified duplex stainless steels were prepared by spray forming using design guidelines provided bythermodynamic calculations. Firstly, an investigation of stable phases and phase formation sequence in duplex steels containinghigh levels of boron was conducted. The calculation indicated that there was an eutectic point at around 1 wt% boron withdifferent primary phase formations upon equilibrium solidification. For hypoeutectic compositions, the primary phase wasδ-Ferrite, whereas for hypereutectic a metallic boride (M2B) should form. Additionally, eutectic reactions for both compositionsshould lead to the formation of borides M2Band M3B2. Secondly, spray forming experiments were conducted basedon the thermodynamic calculations. Sample preparation was carried out using a conventional superduplex steel (2507) asstarting material. Two different compositions were selected: one hypoeutectic (0.8 wt% B) and one hypereutectic (2.5 wt%B). The microstructural investigation revealed the formation of different types of borides embedded in an austenitic-ferriticmatrix. Finally, the wear resistance was evaluated with the dry sand/rubber wheel test and a significant improvement wasobserved for boron-containing steels in comparison with the same steel without boron. This improvement was attributed tothe presence of fine and well-distributed boride particles that protected the austenitic-ferritic matrix from material removal.
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