Enhanced Hardenability of Lean Sintered Steels by the Use of Fine Masteralloy Powders
The use of Ultra High Pressure Water Atomization(UHPWA)technologies brings the opportunity to produce masteralloy(MA)powders with low oxygen contents(~0.1 wt.%),low particle sizes(d50< 8 μm,d90< 20 μm)and rounded morphologies,at very convenient costs(~8 €/kg).This opens a completely new frame of possibilities for the masteralloy concept,because it overcomes one of the main handicaps of this alloying route: the necessity to obtain MA powders with suitable morphologies and particle sizes(<20 μm)at a reasonable cost.This work presents an overview on the properties that can be obtained when adding small amounts of such masteralloy powders to different iron base powders(plain or prealloyed),in both the as-sintered and heat-treated conditions.Steels containing masteralloy additions were produced by sintering in N2-5H2 atmospheres at 1120 ℃ and 1250 ℃,with and without subsequent heat treatments done as forced gas(N2)cooling at~5℃/s.The results give an overview on the portfolio of properties that can be achieved with these materials and show how these lean steels with novel compositions can provide very promising combinations of properties.
Lean steels Masteralloys Hardenability Mechanical Properties Novel alloying elements
De Oro Calderon Raquel Jaliliziyaeian Maryam Dunkley John Gierl-Mayer Christian Danninger Herbert
Institut für Chemische Technologien und Analytik,Technische Universit(a)t Wien,A-1060 Wien/Vienna,Au Atomizing Systems Limited,Sheffield,England
国际会议
北京
英文
1943-1949
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）