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Effect of Die Wall Lubrication on High Velocity Compaction Behavior and Sintering Properties of Fe-Based PM Alloy

Liu Zili, Li Dong, Liu Xiqin, Li Haohao, Huang Xin, Tang Zhihao, Zou Yuwen

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 2

677--684

Fe-based PM alloy powder of Fe-2.5Ni-0.5Mo-2Cu-0.4C was pressed by high velocity compaction combined with die wall lubrication, and the effect of die wall lubrication on high velocity compaction behavior and sintering properties of the Fe-based PM alloy were studied. The results indicate that the impact force, green density, sintered density of samples increase with the augment of the impact velocity and die wall lubrication. Compared with that without die wall lubrication, the green density and sintered density of the sample with die wall lubrication are about 0.07-0.12 g/cm3 and 0.08~0.11 g/cm3 higher at the same impact velocity, respectively, while the ejection force of the die wall lubricated sample is much smaller, and reduced about 26%~36%. The green compact with die wall lubrication has much fewer porosity than that without die wall lubrication, and more mechanical bonding and cold welding regions are observed. The sintered samples mainly consists of gray pearlite and white ferrite, and more pearlite is observed in the sintered sample with die wall lubrication.

Wpływ zmian gęstości wypraski oraz temperatury spiekania na własności wytrzymałościowe spiekanych materiałów konstrukcyjnych Fe-3%Mn-0,8%C

Sułowski M.

Rudy i Metale Nieżelazne

2000

R. 45, nr 9

496-502

Decydujące znaczenie dla własności spiekanych materiałów mają gęstość i temperatura spiekania. W artykule omówiono wpływ tych parametrów na wytrzymałość na zginanie i udarność spiekanych materiałów Fe-3%Mn-0,8%C.

Density and sintering temperature are the most characteristic variables for PM structural parts, and as a consequence, have decisive effect on properties. In this paper the influence of density and sintering temperature on mechanical properties, especially on TRS (transverse rupture strength) and impact energy, are shown.