Method for setting aging conditions and method for producing turbine vanes

Abstract

This method for setting aging conditions is provided with: a step for acquiring a master curve ( 20 ) indicating the relationship between an aging condition parameter and a material strength parameter by executing an aging process on a standard material; a step for acquiring a fitting point (A) indicating the value of the material strength parameter of a subject material of which the chemical component parameters and/or metal structure parameters differ from those of the standard material; a step for acquiring a corrected aging curve ( 30 ) by correcting the master curve ( 20 ) in a manner so that a portion of the master curve ( 20 ) corresponds to the fitting point (A); and a step for setting aging conditions for the subject material on the basis of the corrected aging curve ( 30 ).

1 . A method for setting aging conditions, comprising the steps of:
 acquiring a master curve indicating a relationship between an aging condition parameter and a material strength parameter by executing an aging process on a standard material;   acquiring a fitting point indicating a value of the material strength parameter of a subject material of which a chemical component parameter and/or metal structure parameter differ from those of the standard material;   acquiring a corrected aging curve by correcting the master curve in a manner so that a portion of the master curve corresponds to the fitting point; and   setting aging conditions for the subject material on a basis of the corrected aging curve.   
     
     
         2 . The method for setting aging conditions according to  claim 1 , wherein
 the fitting point is acquired by executing an aging process on the subject material under prescribed conditions and collecting the material strength parameter.   
     
     
         3 . The method for setting aging conditions according to  claim 1 , wherein
 the fitting point is acquired by determining a relationship between the chemical component parameter and metal structure parameter and the material strength parameter, and predicting the material strength parameter from differences in the chemical component parameter and the metal structure parameter between the standard material and the subject material.   
     
     
         4 . The method for setting aging conditions according to  claim 1 , wherein
 the material strength parameter is selected from hardness, tensile strength, and yield strength.   
     
     
         5 . The method for setting aging conditions according to  claim 1 , wherein
 the aging process is performed after the standard material and the subject material are forged.   
     
     
         6 . A method for producing turbine blades for applying the method for setting aging conditions described in  claim 1  to a turbine blade. 
     
     
         7 . The method for producing turbine blades according to  claim 6 , wherein
 the turbine blade is constructed of precipitation hardening stainless steel.   
     
     
         8 . The method for producing turbine blades according to  claim 7 , wherein
 the chemical component parameter is a total content of copper, niobium and tantalum.   
     
     
         9 . The method for producing turbine blades according to  claim 7 , wherein
 the metal structure parameter is grain size and/or residual austenite quantity.