Method for diffusing and permeating creep reinforcement material into heat-resistant metal member, and heat-resistant metal member with enhanced creep strength

Abstract

A creep reinforcement material containing one or a plurality of elements selected from B, W, Cr, Mo, Nb, V, Hf, Zr, Ti, Cu, and Co is coated or thermally sprayed onto a surface of a heat-resistant metal member manufactured using a heat-resistant metal material, and a section coated or thermally sprayed with the creep reinforcement material is covered by a heat-resistant covering member and secured so as to contact the section. The heat-resistant metal member covered by the heat-resistant covering member is heated to a temperature of 1000° C. or greater, and thus compressive force accordingly acts on the heat-resistant metal member as it thermally expands in a direction toward the outer periphery, restraining thermal expansion of the heat-resistant metal member in the direction toward the outer periphery, and enabling the creep reinforcement material on the surface of the heat-resistant metal member to be efficiently diffused and permeated into the heat-resistant metal member.

1 . A method for diffusing and permeating a creep reinforcement material into a heat-resistant metal member, the method comprising:
 coating or thermally spraying a creep reinforcement material onto a surface of a heat-resistant metal member;   covering, by a heat-resistant covering member, a section coated or thermally sprayed with the creep reinforcement material, and securing the heat-resistant covering member so as to contact the section; and   heating the heat-resistant metal member covered by the heat-resistant covering member to a temperature of 1000° C. or greater,   the creep reinforcement material containing one or a plurality of elements selected from B, W, Cr, Mo, Nb, V, Hf, Zr, Ti, Cu, and Co.   
     
     
         2 . The method according to  claim 1 , wherein,
 after heating the heat-resistant metal member covered by the heat-resistant covering member to a temperature of 1000° C. or greater, the heat-resistant metal member covered by the heat-resistant covering member is cooled and re-heated to a temperature of an A 1  transformation point or greater.   
     
     
         3 . A heat-resistant metal member with enhanced creep strength,
 the heat-resistant metal member being obtained by
 coating or thermally spraying a creep reinforcement material onto a surface of a heat-resistant metal member, 
 covering, by a heat-resistant covering member, a section coated or thermally sprayed with the creep reinforcement material, and securing the heat-resistant covering member so as to contact the section, and 
 heating the heat-resistant metal member covered by the heat-resistant covering member to a temperature of 1000° C. or greater; and 
   the creep reinforcement material containing one or a plurality of elements selected from B, W, Cr, Mo, Nb, V, Hf, Zr, Ti, Cu, and Co.   
     
     
         4 . The heat-resistant metal member according to  claim 3 , wherein
 the heat-resistant metal member is obtained by, after heating the heat-resistant metal member covered by the heat-resistant covering member to a temperature of 1000° C. or greater, cooling and re-heating to a temperature of an A 1  transformation point or greater.