Ni-BASED SINGLE CRYSTAL SUPERALLOY AND COMPONENT USING THE SAME AS SUBSTRATE

Abstract

Provided is an Ni-based single crystal superalloy wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 6.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 1.0% by mass to 14.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. The alloy prevents TCP phase precipitation at high temperatures, therefore having improved strength at high temperatures and having oxidation resistance at high temperatures. Specifically, the invention is to provide a high-performance Ni-based single crystal superalloy having well balanced high-temperature strength and high-temperature oxidation resistance in practical use. The invention is also to provide the Ni-based single crystal superalloy having sufficient characteristics in point of “heat treatment window” that should not be overlooked in practical use.

1 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 1.0% by mass to 14.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         2 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 10.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to 6.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 1.0% by mass to 8.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         3 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 6.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 1.0% by mass to 8.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         4 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 6.0% by mass of W, from 5.8% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 1.0% by mass to 8.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         5 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 6.0% by mass of W, from 5.8% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 4.1% by mass to 8.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         6 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to less than 6.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 6.0% by mass of W, from 5.8% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 4.1% by mass to 8.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         7 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to less than 6.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 6.0% by mass of W, from 5.8% by mass to 8.0% by mass of Re, from 0.0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 4.1% by mass to 8.0% by mass of Ru, and from more than 1.0% by mass to 3.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         8 . An Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr, Ru and Nb as the main additive elements, wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to less than 6.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 4.0% by mass to less than 5.0% by mass of W, from 5.8% by mass to 8.0% by mass of Re, from 0.0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 4.1% by mass to 8.0% by mass of Ru, and from more than 1.0% by mass to 3.0% by mass of Nb, with the balance of Ni and inevitable impurities. 
     
     
         9 . The Ni-based single crystal superalloy as claimed in any one of  claims 1 - 8 , which further contains Ti in an amount, as ratio by mass, of at most 2.0% by mass. 
     
     
         10 . The Ni-based single crystal superalloy as claimed in any one of  claims 1 - 8 , which further contains at least any one of B, C, Si, Y, La, Ce, V and Zr. 
     
     
         11 . The Ni-based single crystal superalloy as claimed in any one of  claims 1 - 8 , wherein, when the lattice constant of the matrix phase is represented by a 1  and the lattice constant of the precipitation phase is represented by a 2 , then the relation of a 1  and a 2  satisfies 0.992a 1 ≦a 2 <a 1 . 
     
     
         12 . An alloy component comprising an Ni-based single crystal superalloy as the substrate, wherein the Ni-based single crystal superalloy is the Ni-based single crystal superalloy of any one of  claims 1 - 8 .