Low-Temperature Impact-Strength of Iron-Powder Bars.
WATERVLIET ARSENAL NY
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Bars were made of three types of iron powder atomized, electrolytic and hydrogen-reduced mill scale, at two different sintering temperatures and several different compacting pressures. Charpy impact-strength was then measured on each variety of bar at -40 degrees the values obtained ranged from 38 to 5 ft-lb. The impact-strength of both the atomized and the electrolytic iron-powder but not the hydrogenreduced mill scale increased as compacting pressure and sintering temperature increased. However, no value of impact-strength achieved is high enough for cannon components. Since this investigation does not show the characteristics of all metal powders, additional investigations should be made of heat-treated alloy-steel powders, more like gun steels. Such investigations are expected to show higher strength in both tensile and impact tests. Author