The Effect of Sintering Temperature and Flow on the Properties of Ni-Mo Steel Hot P/M Formed Material 740982
Water-atomized nickel-molybdenum alloy (0.5 Ni-0.5 Mo) powder was blended with graphite for 0.4% carbon, then pressed into preforms (1.5 X 2 X 5 in). The preforms were hot formed to full density via a variety of processing conditions (various degrees of flow, sintering temperature, and sintering atmosphere). Impact specimens were excised and tested over a range of temperatures to determine the ductile-to-brittle transition temperature.
All impact specimens had ductile failure at room temperature. In general, increased deformation increased the room-temperature and low-temperature impact strengths by eliminating particle boundaries and elongating the inclusions. High temperature sintering reduced the oxygen content and improved the impact strength by reducing the number of crack-initiating inclusions.
Jominy hardenability test results were unaffected by various sintering conditions because the amount of easily oxidizable alloying elements was kept to a minimum.
Citation: Cook, J., "The Effect of Sintering Temperature and Flow on the Properties of Ni-Mo Steel Hot P/M Formed Material," SAE Technical Paper 740982, 1974, https://doi.org/10.4271/740982. Download Citation
Author(s):
John P. Cook
Affiliated:
Hoeganaes Corp.
Pages: 11
Event:
International Automobile Engineering and Manufacturing Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1974 Transactions-V83-A
Related Topics:
Powder metallurgy
Steel
Alloys
Particulate matter (PM)
Graphite
Oxygen
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