Fine grained Ni-based alloys for resistance to stress corrosion cracking and methods for their design
AssigneeScoperta, Inc.
InventorJustin Lee Cheney
Life of this patent
Estimating the term…
Abstract
A class of nickel based alloys having a fine grain structure resistant to stress corrosion cracking, and methods of alloy design to produce further alloys within the class are presented. The alloys act as suitable welding materials in similar applications to that of Alloy 622. The fine-grained structure of these novel alloys may also be advantageous for other reasons as well such as wear, impact, abrasion, corrosion, etc. These alloys have similar phases to Alloy 622 in that they are composed primarily of austenitic nickel, however the phase morphology is a much finer grained structure opposed to the long dendritic grains common to Alloy 622 when it is subject to cooling rates from a liquid state inherent to the welding process.
Claims12
A method, comprising:
- welding a substrate to form a weld bead using a cored welding wire, the cored welding wire comprising a sheath comprising nickel and having a sheath melting temperature and a powder core disposed within the sheath;
- wherein the weld bead has a weld melting temperature at least 50° C. greater than the sheath melting temperature;
- and
- wherein during welding the sheath and powder core are melted to form a welding pool, wherein the welding pool is applied to the substrate to form the weld bead, the welding pool comprising a substrate dilution component and a weld component.
A method of applying a coating to a substrate comprising:
- providing a metal cored welding wire containing an outer sheath formed from an alloy of a certain melting temperature and an inner powder comprising one or more metal alloy compositions;
- and
- welding the metal cored welding wire onto a substrate to form an alloy coating, wherein the sheath and powder of the metal cored wire are melted together during welding;
- wherein the alloy coating has a melting temperature at least 5020 C. greater than a melting temperature of the outer sheath;
- wherein welding the metal cored welding wire onto a substrate comprises forming a welding pool, the welding pool comprising a substrate dilution component and a weld component.
A method of applying a coating to a substrate Comprising:
- providing a metal cored welding wire containing an outer sheath formed from an alloy of a certain melting temperature and an inner powder comprising one or more metal alloy compositions;
- and
- welding the metal cored welding wire onto a substrate to form an alloy coating, wherein the sheath and powder of the metal cored wire are melted together during welding;
- wherein the alloy coating has a melting temperature at least 50° C. greater than a melting temperature of the outer sheath;
- wherein welding the metal cored welding wire onto a substrate comprises forming a welding pool, the welding pool comprising a substrate dilution component and a weld component, the weld component comprising in weight percent a mixture of one or more of the following:
- NibalCr27.35Mo10.71Fe0.23Si2.71B1.17;
- NibalCr28.86Mo15.17Fe0.14Si1.13B0.47;
- NibalCr26.7Mo12.7Si1.0B0.4;
- and
- NibalCr25.78Mo5.65B0.69C0.02.
A method of applying a coating to a substrate comprising:
- providing a metal cored welding wire containing an outer sheath formed from an alloy of a certain melting temperature and an inner powder comprising one or more metal alloy compositions;
- and
- welding the metal cored welding wire onto a substrate to form an alloy coating, wherein the sheath and powder of the metal cored wire are melted together during welding;
- wherein the alloy coating has a melting temperature at least 50° C. greater than a melting temperature of the outer sheath;
- wherein the sheath alloy component of the cored wire comprises in weight percent a mixture of one or more of the following:
- NibalCr27.35Mo 10.71Fe0.23 Si2.71B1.17;
- NibalCr28.86Mo15.17Fe0.14Si1.13B0.47;
- NibalCr26.7Mo12.7Si1.0B0.4;
- and
- NibalCr25.78Mo5.65B0.69C0.02.
Dependencies are inferred from the claim text.