Nickel base alloy forged parts

In a process for fabricating recrystallized, large forged parts having fine grain size from a heat resisting alloy selected from one of nickel-base alloy, iron-nickel-chromium-molybdenum alloy, cobalt-chromium-nickel-base alloy and nickel-cobalt-base alloy wherein a body of said alloy is provided, the improvement wherein said body is heated to above the recrystallization temperature of the alloy and subjected to a first upset forging operation to provide a reduction in the original length of the body followed by redrawing said first upset forged body, recrystallizing prior to upset forging it a second time wherein its length is reduced at least 50%, followed by solution heat treating, quenching and aging, the forged parts having an ASTM grain size of 3 or finer as measured by ASTM E112 Intercept method.

In a process for fabricating recrystallized forged parts from INCONEL 706 having fine grain size wherein a body of the alloy is provided, the improvement wherein said body is heated to above the recrystallization temperature of the alloy and subjected to a first upset forging operation to provide a reduction in the original length of the body followed by redrawing said first upset forged body, said forged parts further being provided in a condition resulting from recrystallizing said body prior to upset forging it a second time wherein its length is reduced at least 25%, followed by recrystallization and a third upset forging step which provides a reduction in length of at least 75% followed by recrystallization and solution heat treating, quenching and aging, the forged parts having an ASTM grain size of 3 or finer as measured by ASTM E112 Intercept method and a yield strength in the range of 135 to 175 KSI.

In a process for fabricating a turbine spacer or a turbine disc for a land-based turbine wherein the spacer or disc is forged from a body of INCONEL 706 alloy, the spacer and turbine disc having a fine grain size, the improvement wherein said body is heated to above the recrystallization temperature of the alloy and subjected to a first upset forging operation to provide a reduction in the original length of the body followed by redrawing said first upset forged body, said forged parts further being provided in a condition resulting from recrystallizing said body prior to upset forging it a second time wherein its length is reduced at least 25%, followed by recrystallization and a third upset forging step which provides a reduction in length of at least 75% followed by recrystallization and solution heat treating, quenching and aging, the forged parts having an ASTM grain size of 3 or finer as measured by ASTM E112 Intercept method and a yield strength in the range of 135 to 175 KSI.

In a process for fabricating a turbine spacer or a turbine disc for a land-based turbine wherein the spacer or turbine disc is forged from a body of INCONEL 706 alloy and provided in recrystallized form, the spacer and disc having a fine grain size, the improvement wherein said body is heated to above the recrystallization temperature of the alloy and subjected to a first upset forging operation to provide a reduction in the original length of the body followed by redrawing said first upset forged body, said forged parts further being provided in a condition resulting from recrystallizing said body prior to upset forging it a second time wherein its length is reduced at least 25%, followed by recrystallization and a third upset forging step which provides a reduction in length of at least 75% followed by solution heat treating, quenching and aging, the forged parts having an ASTM grain size of 3 or finer as measured by ASTM E112 Intercept method.

A large alloy forging, the forging having an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy, the forging having a grain size of ASTM grain size 3 or finer, as measured by ASTM method E112 and having a tensile strength in the range of 135 to 175 KSI.

A recrystallized large alloy forging, the forging having a nickel base alloy composition selected from INCONEL 706, INCONEL 625 and INCONEL 718, the forging having a grain size of ASTM grain size 3 or finer, having a yield strength in the range of 135 to 175 KSI, ultimate tensile strength of 170 to 210 KSI.

In the manufacture of a forged turbine spacer or disc product by a process that includes upset forging, the improvement wherein the spacer and disc have an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy, the product is provided in recrystallized form and have a grain size of ASTM grain size 3 or finer, as measured by ASTM method E112 and have a yield strength in the range of 135 to 175 KSI.

In the manufacture of a forged turbine spacer or disc product by a process that includes upset forging, the improvement wherein the spacer or disc product has an alloy composition of INCONEL 706, the spacer and disc product provided in recrystallized form and having a grain size of ASTM grain size 3 or finer, as measured by ASTM method E112 and having a yield strength in the range of 135 to 175 KSI.

A large alloy forged turbine spacer or disc product for a land-based turbine, the spacer or disc product having an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy, the product having a grain size of ASTM grain size 3 or finer, as measured by ASTM method E112 and having a yield strength in the range of 135 to 175 KSI.

A recrystallized large alloy forged turbine spacer or disc product for a land-based turbine, the spacer or disc product having a nickel base alloy composition selected from INCONEL 706, INCONEL 715 and INCONEL 718, the product having a grain size of ASTM grain size 3 or finer, having a yield strength in the range of 135 to 175 KSI, ultimate tensile strength of 170 to 210 KSI.