Low-Pressure Injection Molding Processing of AISI T15 High Speed Steel Powders

João Franklin Liberati; Oscar O. Araujo Filho; Waldemar Alfredo Monteiro; Iara M. Esposito; Rejane A. Nogueira; Francisco Ambrozio Filho

doi:10.4028/www.scientific.net/MSF.514-516.569

Paper Titles

Phase Formation in Austenitic Stainless Steel A-TIG Welds
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Texture and Evolution of Recrystallization in Low Carbon Steel Wire
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Residual Stress Evaluation on X 36 Cr Mo 17 HSM Finished Mould Steel
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Surface Integrity of H13 ESR Mould Steel Milled by Carbide and CBN Tools
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Low-Pressure Injection Molding Processing of AISI T15 High Speed Steel Powders
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Fatigue Properties of a Ck45 Steel Coated with a Post-Heat Treated Ni-Cu-P Electroless Deposit
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Application of Advanced Multiphase Steels in Crashworthiness Structures: Experimental Study and Constitutive Equations
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Transverse Rupture Strength of M3:2 High Speed Steel Produced through Conventional Casting and Powder Metallurgy Techniques
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Dislocation Microstructure in Copper Multicrystals Deformed under the Sequences: Rolling - Tension and Tension - Rolling
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Low-Pressure Injection Molding Processing of AISI T15 High Speed Steel Powders

Abstract:

Low-pressure powder injection molding was used to obtain AISI T15 high speed steel parts. The binders used were based on paraffin wax, low density polyethylene and stearic acid. The metals powders were characterized in terms of morphology, particle size distribution. The mixture was injected in the shape of square bar specimens to evaluate the performance of the injection in the green state, and then sintered. The samples were injected under the pressures of 0.4, 0.5 and 0.7MPa and at temperatures varying from 110 to 150°C aiming the optimization of the process. The results of the variation of injection pressure were evaluated by measuring the density of the green parts. Debinding was carried out in two steps: first, the molded part was immersed in heptane to remove the major component of the binder and then heated to remove the remaining binder. A second step debinding and sintering were performed in a single step. This procedure shortened considerably the debinding and sintering time.