New possibilities for the masteralloy approach
محل انتشار: ششمین کنفرانس بین المللی متالورژی پودر
سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 412
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شناسه ملی سند علمی:
PMAUTO06_084
تاریخ نمایه سازی: 23 آذر 1397
چکیده مقاله:
The Masteralloy (MA) alloying route has a great potential for reducing the alloying costs in sintered steels, while allowing the introduction of innovative alloying systems. However, in order to achieve an efficient use of the alloying elements, the particle sizes needed are often below 25 µm, which means that for standard gas atomization a significant fraction of the batch has to be discarded. This work evaluates the performance of steels containing MA powders obtained with a novel atomization technique (Ultra-High-Pressure Water atomization) that allows the production of low-cost powders with low oxygen contents, rounded morphologies and mean particle sizes as low as 6 microns. Mechanical properties, dimensional variations and interstitial contents were measured in steels containing different MA compositions sintered at either 1120 °C or1250 ºC in N2-5H2 atmospheres. With less than 3 wt.% of alloying elements these steels present excellent combinations of properties, reaching strength levels between 560-915 MPa and hardness 220-260 HV10, combined with elongations of 1.3-3.2% and impact energies around 20-30 J/cm2.
کلیدواژه ها:
نویسندگان
Raquel de Oro Calderon
Institute of Chemical Technologies and Analytics, Vienna University of Technology
Maryam Jaliliziyaeian
Institute of Chemical Technologies and Analytics, Vienna University of Technology
John Dunkley
Atomizing Systems Limited, Sheffield, England
Christian Gierl-Mayer
Institute of Chemical Technologies and Analytics, Vienna University of Technology