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US 2014/0234154 A1Published application
Hard weld overlays resistant to re-heat cracking
AssigneeScoperta, Inc.
InventorsJustin Lee Cheney, Shengjun Zhang, John Hamilton Maddock
Life of this patent
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Abstract
A hard weld overlay which is resistant to cracking when re-heated, and a method for designing such alloys, is disclosed. The alloys are able to resist re-heat cracking through prevention of the precipitation and/or growth of embrittling carbide, borides, or borocarbides at elevated temperatures. In one embodiment, the thermodynamics of the alloy system possess only primary carbides and secondary ferrite carbides.
Claims24
(canceled)
A hardfacing weld deposit comprising:
- a hardness of at least 60 HRC;
- and
- a microstructure comprising:
- an iron-based matrix;
- and
- carbides and/or borides;
- wherein the carbides and/or borides comprise only carbides and/or borides which precipitate prior to solidification of the iron-based matrix.
4 more elements
A hardfacing weld deposit comprising:
- a hardness of at least 60 HRC;
- and
- a stable carbide and/or boride structure;
- wherein a mole fraction of the stable carbide and/or boride structure does not change by more than 25% when reheated.
1 more element
A hardfacing weld deposit comprising:
- a hardness of at least 60 HRC;
- and
- carbides and/or borides;
- wherein the carbides and/or borides comprise an iron concentration of 50 wt. % or less.
1 more element
A hardfacing weld deposit comprising:
- a hardness of at least 60 HRC;
- and
- an austenite to ferrite transition temperature which is outside a re-heat temperature range.
Dependencies are inferred from the claim text.