Metal structure, method of manufacturing metal structure, spring component, chronograph coupling lever for timepiece, and timepiece
AssigneeSeiko Instruments Inc.
InventorsMiei Konishi, Matsuo Kishi, Takashi Niwa
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Abstract
A metal structure includes, by mass %, Fe: 10% to 30%; S: 0.005% to 0.2%; and the balance consisting of Ni and unavoidable impurities, in which a maximum grain size of the metal structure is 500 nm or less. The metal structure preferably has one or more of a stress relaxation rate of 10% or less, a lattice constant of 3.535 Å to 3.56 Å, a yield stress of 1500 MPa or more, a Young's modulus of 150 GPa or more and a Vickers hardness of Hv 580 or more.
Claims19
A metal structure comprising, by mass %:
- Fe:
- 10% to 30%;
- S:
- 0.005% to 0.2%;
- and
- the balance consisting of Ni and unavoidable impurities,
- wherein a maximum grain size of the metal structure is 500 nm or less, and
- wherein a stress relaxation rate of the metal structure is 10% or less.
A method of manufacturing a metal structure, the method comprising:
- forming by an electroforming a metal structure including, by mass %,
- Fe:
- 10% to 30%;
- S:
- 0.005% to 0.2%;
- and
- the balance consisting of Ni and unavoidable impurities;
- and
- performing a heat treatment to the metal structure under conditions in which a heat treatment temperature is 140° C. to 350° C. and a Larson-Miller parameter is in a range from 7500 to 9500.
A chronograph coupling lever for a timepiece, the chronograph coupling lever comprising:
- a spring component,
- wherein the spring component includes a metal structure,
- wherein the metal structure includes by mass %,
- Fe:
- 10% to 30%,
- S:
- 0.005% to 0.2%,
- and the balance consisting of Ni and unavoidable impurities, and
- wherein a maximum grain size of the metal structure is 500 nm or less.
A timepiece comprising:
- a chronograph coupling lever having a spring component which uses the chronograph coupling lever for a timepiece,
- wherein the spring component includes a metal structure,
- wherein the metal structure includes by mass %,
- Fe:
- 10% to 30%,
- S:
- 0.05% to 0.2%,
- and the balance consisting of Ni and unavoidable impurities, and
- wherein a maximum grain size of the metal structure is 500 nm or less.
Dependencies are inferred from the claim text.