Method for toughening treatment of metallic material
AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorAkio Deguchi
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Abstract
A method for providing a toughening treatment for metallic material is herein described, which method is characterized in that the metallic material is subjected to a transformation super-plastic treatment by applying a mechanical load to said material while placing the same under a triangular-wave temperature cycle passing over a transformation point.
Claims10
A method for providing a toughening treatment for a piece of steel which has at least one transformation point, that is a limiting temperature at which a change in phase occurs, by making use of transformation super-plastic phenomena, comprising:
- simultaneously
- a. applying a shearing stress to the piece of steel, and
- b. cyclicly heating for a half cycle and cooling for a half cycle the piece of steel,
- and in so doing, observing the following constraints:
- 1. the applied shearing stress has a value in the range of about 1/20th to about 1/10th of the yield point of said steel;
- 2. each half-cycle during which the steel is heated, it is raised to a temperature that is above said transformation point, and each half-cycle during which the steel is cooled, it is lowered to a temperature that is below said transformation point;
- 3. the steel is subjected to at least three of these heating and cooling cycles, and
- 4. ach such cycle has a period of about 20 seconds.
A method for providing a toughening treatment for a piece of metallic material which has at least one transformation point, that is a limiting temperature at which a change in phase occurs, by making use of transformation super-plastic phenomena, consisting essentially of simultaneously
- a. applying a shearing stress to the piece of metallic material, and
- b. cyclicly heating for a half cycle and cooling for a half cycle the piece of metallic material, and in so doing, observing the following constraints:
- 1. the applied shearing stress has a value in the range of about 1/20th to about 1/10th of the yield point of said metallic material;
- 2. each half-cycle during which the metallic material is heated is raised to a temperature that is above the transformation point, and each half-cycle during which the metallic material is cooled, it is lowered lowered to a temperature that is below said transformation point;
- and
- 3. the material material is subjected to at least three of these heating and cooling cycles.
Dependencies are inferred from the claim text.