Abstract: A method for fabricating an article includes forming a billet consisting essentially of a stainless steel composition of manganese 2.00 wt. %-24.00 wt. % chromium 19.00 wt. %-30 wt. % molybdenum 0.50 wt. %-4.0 wt. % nitrogen 0.25 wt. %-1.10 wt. % carbon ?1 wt. % phosphorus ?0.03 wt. % sulfur ?1 wt. % nickel <22 wt. % cobalt <0.10 wt. % silicon ?1 wt. % niobium ?0.80 wt. % oxygen ?1 wt. % copper ?0.25 wt. % balance iron. The billet is annealed and cold worked to form an article. Without annealing of the article, the article is subsequently case hardened at a single case hardening temperature to form a surface layer on a top surface thereof. Articles formed with the indicated stainless steel composition with case hardened surface layers are also provided.

Abstract: A low coefficient of thermal expansion high strength alloy and methods of formation thereof, the alloy including: chromium 7 wt. % to 10 wt. %; molybdenum 20 wt. % to 25 wt. %; tungsten 4 wt. % to 7 wt. %; aluminum 0.5 wt. % to 2 wt. %; titanium 0.5 wt. % to 2 wt. %; boron 0.005 wt. % to 0.05 wt. %; niobium ?3.9 wt. % tantalum ?3.9 wt. % vanadium 0.1 wt. % to 4 wt. %; niobium, tantalum, and vanadium, in combination 0.1 wt. % to 4 wt. %; silicon <0.5 wt. %; zirconium <0.5 wt. %; hafnium <0.5 wt. %; yttrium <0.5 wt. %; copper <0.1 wt. %; manganese <0.1 wt. %; phosphorus <0.1 wt. %; sulfur <0.1 wt. %; iron <5 wt. %; cobalt ?15 wt. %; balance nickel, cobalt and nickel, in combination 50 wt. % to 70 wt. %, and aluminum and titanium, in combination ?1.4 wt. %.

Abstract: A precipitation hardenable, cobalt-nickel base superalloy is disclosed. The is characterized by the following weight percent composition. C about 0.01 to about 0.15 Cr about 6.00 to about 15.00 Ni about 30.00 to about 45.00 W about 3.00 to about 15.00 Ti about 0.50 to about 4.00 Al about 3.00 to about 7.00 Nb up to about 2.50 Ta up to about 6.00 Hf up to about 1.50 Zr up to about 1.50 B up to about 0.20 Mo up to about 2.50 Si up to about 1.50 The balance of the alloy is cobalt and usual impurities. The alloy provides a novel combination of strength and ductility after long-term exposure to elevated operating temperatures as found in gas turbines and jet engines. A fine-grain steel article made from the alloy is also disclosed. The steel article is also characterized by a continuous surface layer of Al2O3 and Cr2O3 that protects the alloy from oxidation at the elevated operating temperatures.

Abstract: A method for fabricating an article includes forming a billet consisting essentially of a stainless steel composition of manganese 2.00 wt. %-24.00 wt. % chromium 19.00 wt. %-30 wt. % molybdenum 0.50 wt. %-4.0 wt. % nitrogen 0.25 wt. %-1.10 wt. % carbon ?1 wt. % phosphorus ?0.03 wt. % sulfur ?1 wt. % nickel <22 wt. % cobalt <0.10 wt. % silicon ?1 wt. % niobium ?0.80 wt. % oxygen ?1 wt. % copper ?0.25 wt. % balance iron. The billet is annealed and cold worked to form an article. Without annealing of the article, the article is subsequently case hardened at a single case hardening temperature to form a surface layer on a top surface thereof. Articles formed with the indicated stainless steel composition with case hardened surface layers are also provided.

Abstract: A precipitation hardenable, cobalt-nickel base superalloy is disclosed. The is characterized by the following weight percent composition. C about 0.01 to about 0.15 Cr about 6.00 to about 15.00 Ni about 30.00 to about 45.00 W about 3.00 to about 15.00 Ti about 0.50 to about 4.00 Al about 3.00 to about 7.00 Nb up to about 2.50 Ta up to about 6.00 Hf up to about 1.50 Zr up to about 1.50 B up to about 0.20 Mo up to about 2.50 Si up to about 1.50 The balance of the alloy is cobalt and usual impurities. The alloy provides a novel combination of strength and ductility after long-term exposure to elevated operating temperatures as found in gas turbines and jet engines. A fine-grain steel article made from the alloy is also disclosed. The steel article is also characterized by a continuous surface layer of Al2O3 and Cr2O3 that protects the alloy from oxidation at the elevated operating temperatures.

Abstract: A precipitation hardenable, cobalt-nickel base superalloy is disclosed. The is characterized by the following weight percent composition. C about 0.01 to about 0.15 Cr about 6.00 to about 15.00 Ni about 30.00 to about 45.00 W about 3.00 to about 15.00 Ti about 0.50 to about 4.00 Al about 3.00 to about 7.00 Nb up to about 2.50 Ta up to about 6.00 Hf up to about 1.50 Zr up to about 1.50 B up to about 0.20 Mo up to about 2.50 Si up to about 1.50 The balance of the alloy is cobalt and usual impurities. The alloy provides a novel combination of strength and ductility after long-term exposure to elevated operating temperatures as found in gas turbines and jet engines. A fine-grain steel article made from the alloy is also disclosed. The steel article is also characterized by a continuous surface layer of Al2O3 and Cr2O3 that protects the alloy from oxidation at the elevated operating temperatures.