Transient liquid phase bonding to cold-worked surfaces
AssigneeSiemens Westinghouse Power Corporation
InventorsZafir Abdo, Patricia Bezerra, Paul Zombo
Life of this patent
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Abstract
A joint (32) having bond line grains (28) that nucleate in the joint region (32) and grow into the adjoined solid substrates (12, 14). The resulting bond line grains have a size that is greater than a thickness (T) of a molten region (15). The surfaces of the substrates are cold worked to a desired degree of residual stress prior to the bonding process so that the recrystallization of the substrate surface necessary for the grains to grow into the substrates results in a reduction in the local free energy.
Claims24
A materials joining process comprising:
- cold working a surface of a substrate;
- and
- bonding a consumable insert to the substrate surface with a transient liquid phase bonding process;
- wherein the substrate surface is cold worked to a degree sufficient to cause grains nucleating in a molten region of the consumable insert during the transient liquid phase bonding process to grow into the substrate to produce bond line grains having a size exceeding a thickness of the molten region.
A materials joining process comprising:
- applying a joining process to join two substrates to form a joint having grains;
- cold working the substrates proximate the joint;
- and
- heat treating the substrates and the joint together to recrystallize and grow the joint grains;
- wherein the substrate is cold worked to a degree sufficient to cause the joint grains to recrystallize and grow into the substrate during the heat treating step.
A materials joining process comprising:
- cold working a substrate surface;
- applying a second material against the cold worked substrate surface;
- heating the second material and cold worked substrate surface together to a bonding temperature;
- and
- wherein the substrate surface is cold worked to a degree sufficient to allow grains nucleating in the second material to grow into the substrate surface during the heating step.
A materials joint comprising non-epitaxial grains nucleated from within a joint region and grown from within the joint region into an adjoined region of a substrate.
Dependencies are inferred from the claim text.