| Autor: |
Kernan, Brian D., Sachs, Emanuel M., Allen, Samuel M., Sachs, Christoph, Raffenbeul, Lukas, Pettavino, Alberto, Lorenz, Adam |
| Předmět: |
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| Zdroj: |
Metallurgical & Materials Transactions. Part A; Oct2005, Vol. 36 Issue 10, p2815-2827, 13p, 8 Charts, 11 Graphs |
| Abstrakt: |
The direct manufacture of metal parts by rapid prototyping (RP) often involves using a metal powder. Densification of the powder can be done either by sintering or infiltration. Infiltration avoids the shrinkage and distortion that typically accompanies sintering. However, in steels, the use of copper or bronze infiltrants limits the usefulness of parts because of the nonhomogeneous structure and properties. In this work, a conventional tool steel alloy has been made via homogeneous steel infiltration (HSI), a gated infiltration process that uses as the infiltrant a steel alloy with a lower melting point than the base powder. The infiltrant liquid uses carbon or silicon as a melting point depressant (MPD). Freeze-off of the steel infiltrant is avoided by infiltrating at a temperature at which some liquid is stable at chemical equilibrium. Examples of successful infiltrations using D2 tool steel as a target composition are shown. Mechanical properties (hardness and impact strength) following various heat treatments of the infiltrated D2 are compared with conventional wrought D2 tool steel and found to be very similar. The HSI is believed to be suitable to a wide variety of tool steels and stainless steels. Further, the process is applicable to the postprocessing of any suitable steel skeleton made by RP, as well as other powder metallurgy processes, such as metal injection molding. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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