Characterizing the Effect of Laser Power on Laser Metal Deposited Titanium Alloy and Boron Carbide
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Characterizing the Effect of Laser Power on Laser Metal Deposited Titanium Alloy and Boron Carbide E.T. AKINLABI and M.F. ERINOSHO Titanium alloy has gained acceptance in the aerospace, marine, chemical, and other related industries due to its excellent combination of mechanical and corrosion properties. In order to augment its properties, a hard ceramic, boron carbide has been laser cladded with it at varying laser powers between 0.8 and 2.4 kW. This paper presents the effect of laser power on the laser deposited Ti6Al4V-B4C composites through the evolving microstructures and microhardness. The microstructures of the composites exhibit the formation of a-Ti phase and b-Ti phase and were elongated towards the heat affected zone. These phases were terminated at the fusion zone and globular microstructures were found growing epitaxially just immediately after the fusion zone. Good bondings were formed in all the deposited composites. Sample A1 deposited at a laser power of 0.8 kW and scanning speed of 1 m/min exhibits the highest hardness of HV 432 ± 27, while sample A4 deposited at a laser power of 2.0 kW and scanning speed of 1 m/min displays the lowest hardness of HV 360 ± 18. From the hardness results obtained, ceramic B4C has improved the mechanical properties of the primary alloy. DOI: 10.1007/s11661-017-4297-1 Ó The Minerals, Metals & Materials Society and ASM International 2017
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INTRODUCTION
IN the history of manufacturing, various techniques have been developed to fabricate complex and refined products. Some of these techniques adopted are grouped under the machining equipment such as milling, drilling, turning, shaping machines, and so on. Material removal is always certain from the stated techniques before the final product could be fabricated. In order to limit the material wastage to the minimum, the introduction of additive manufacturing came into play with the aim of manufacturing product with complex geometry.[1] It is regarded as a prototyping technology and one the most revolutionary inventions in the industrial age. The capability of this technology to producing completely well-designed parts with a wide range of materials is highly commendable.[2] According to research, titanium alloys have contributed a huge role in the aerospace industries; however the use of boron carbide (B4C) and titanium alloy is limited.[3] The high hardness and low density of boron carbide have made it a good property accompaniment in titanium alloy for aerospace, nuclear, electronics application,[4] and some cutting tools and die.[5] The influence of TiB2 on the microstructural E.T. AKINLABI and M.F. ERINOSHO are with the Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg, 2006 South Africa. Contact e-mail: [email protected] Manuscript submitted January 8, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
behavior and the microhardness of TiB2-B4C composite was investigated and analyzed. The samples were consolidated with 5, 15, and 25 wt pct of B4C usi
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