Sintered steel particles containing dispersed carbides
Abstract
Abstract THE INVENTION RELATES GENERALLY TO POWDERED METAL ARTICLES AND METHOD FOR PRODUCING THE SAME. IN MORE PARTICULAR ASPECTS, THE INVENTION RELATES TO POWDERED METAL ARTICLES PRODUCED FROM HIGH SPEED TOOL AND DIE STEEL COMPOSITIONS BY HOT COMPACTING PARTICLES OF SAID COMPOSITIONS. THE PARTICLES RANGE IN SIZE FROM ABOUT -30 OR FINER STANDARD MESH AND CONTAIN A REACTIVE METAL COMPONENT SUCH AS TITANIUM, VANADIUM, ZIROCONIUM, COLUMBIUM, MOLYBDENUM, TUNGSTEN OR TANTALUM. THE REACTIVE METAL COMPONENT IS REACTED WITH A NON-METAL, WHICH MAY BE CARBON, OXYGEN OR NITROGEN, TO PRODUCE A NONMETALLIC DISPERSION OF SAID REACTIVE METAL AND NON-METAL. THE ARTICLE IS CAPABLE OF HARDENING TREATMENT BY CONVENTIONAL AUSTENITIZING, QUENCHING AND TEMPERING TO HARDNESS LEVELS ABOVE ABOUT 58 RC FOR DIE STEEL AND 64 RC FOR HIGH SPEED STEELS. AUSTENITIZING TO THESE HIGH HARDNESS LEVELS MAY BE ACHIEVED IN VERY SHORT TIMES ON THE ORDER OF TWO MINUTES OR LESS. IN ADDITION DURING HARDENING TREATMENT THE SYMMETRY OR OUT-OF-ROUNDNESS OF THE ARTICLE REMAINS SUBSTANTIALLY UNCHANGED.
Inventors
- 👤 Gary Steven
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |