Method for providing strong tough metal alloys
US4042421A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1975 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Dec 3, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for improving the strength and toughness of an austenitic metal alloy selected from the group consisting of stainless steel alloys of the AISI 200 and 300 series and non-stainless steel alloys containing iron, manganese, chromium, and carbon, said alloy having an Md temperature of no higher than about 100.degree. C and an Ms temperature of no higher than about minus 100.degree. C comprising the following steps: PA1 A. deforming the alloy at a strain of at least about 10 percent at a temperature in the range of about Md minus 50.degree. C to about Md plus 50.degree. C, said Md temperature being that of the alloy undergoing deformation, in such a manner that the material has a martensite phase of no greater than about 10 percent by volume and an austenite phase of at least about 90 percent by volume; and PA1 B. deforming the material produced in step (a) at a strain of at least about 10 percent and at a temperature no higher than minus 75.degree. C in such a manner that the material has a martensite phase of at least about 50 percent by volume and an austenite phase of at least about 10 percent by volume; and PA1 An aged crystalline microstructure consisting essentially of a…
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