Method for heat-treating metal materials
US11028470B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Oct 27, 2017 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Jun 17, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/043
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for heat treating metal materials by passing electrical current through a metallic workpiece to heat the workpiece via Joule heating to a preselected temperature for a preselected period of time, based upon the formula I2×R×t, wherein I is current, R is resistance and t is time. The current may be a direct or an alternating one. Various configurations of the method are envisioned wherein multiple current inputs and outputs are attached to the metal material so as to selectively heat specific portions of the piece including irregular shapes and differing diameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.