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4585 |
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Wednesday, May 11, 2016, Room 3G 9:20 AM Wear Protection |
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New hardfacing material with high impact wear resistance |
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Sven Bengtsson* / Höganäs AB, Sweden Senad Dizdar/ Höganäs AB, Sweden Barbara Maroli/ Höganäs AB, Sweden Luc Baguette/ Höganäs Belgium SA, Belgium |
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Many applications in oil & gas, mining and agricultural equipment are subjected to impact loading and wear in service. A common method to counteract these failure mechanisms is to apply a hard coating, thus increasing service life. However, normally, materials with a high hardness exhibit a low impact resistance and vice versa so compromises are necessary. Typical deposition methods are metal inert gas overlay welding, plasma transferred arc, and laser cladding. In the present work clad layers of a new iron based alloy, exhibiting an unusually high impact resistance combined with high hardness and good wear performance is presented. The material is compared to two commercially available materials, AISI D2 reference is a commonly used cold work tool steel and WC-NiCrSiB is a common choice for severe hardfacing applications. The latter material is a composite formed by adding tungsten carbide particles to a self-fluxing nickel alloy. The new material is a FeWCrCB tool steel, with fine carbides and borides in a martensitic matrix. The material solidifies in a narrow temperature range, limiting segregation during solidification. The first phase formed is an fcc phase that forms dendrites at most solidification rates followed by a eutectic structure consisting of austenite, carbides and borides. Following solidification the austenite is transformed to martensite. The impact wear results show approximately 10x longer life compared to tungsten carbide nickel alloy coating. The abrasive wear performance is close to that of the tungsten carbide nickel base material, but about three times better than AISI D2 tool steel. |