Speaker
Description
For economic reasons, moderate sintering temperatures are usually preferred in the industrial production of PM steels, despite technical advantages of high sintering temperatures. In recent years, advances in the atomization technologies as well as in the alloying design area have provided the possibility of producing fine masteralloy powders that afford homogenization of the alloying elements at fairly low sintering temperatures. The present study shows how the use of “tailored” liquid phases, attained by using suitably designed masteralloy powders, provide an excellent distribution of oxygen-sensitive elements (Cr, Mn and Si) at standard sintering temperatures of 1120°C and 1180°C. Liquid phase formation and alloying element distribution are monitored through sintering experiments interrupted at different stages of the sintering process by quenching. Besides, the influence of the total amount of carbon and the chemical composition of the base powder and the masteralloy on the behavior of the liquid phase is discussed.
Keywords: sintered steels; masteralloys, hybrid alloying, transient liquid phase, quenching experiments
| Speaker Country | Austria |
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