Sintered material

Abstract

A sintered material made of an iron-based alloy is provided, wherein a content of Ni is more than 0.2 mass % and 10 mass % or less in an entire iron-based alloy; a content of C is more than 0 mass % and 2.0 mass % or less in the entire iron-based alloy; at least one element selected from Mo, Mn, Cr B and Si is more than 0 mass % and 5.0 mass % or less in total in the entire iron-based alloy; and a rest of the iron-based alloy is Fe and incidental impurities. A content of Ni in a local region of the iron-based alloy is more than 0.2 mass % and less than 21 mass %. A relative density is 97% or more.

1 . A sintered material made of an iron-based alloy,
 wherein a content of Ni is more than 0.2 mass % and 10 mass % or less in an entire iron-based alloy; a content of C is more than 0 mass % and 2.0 mass % or less in the entire iron-based alloy; at least one element selected from Mo, Mn, Cr B and Si is more than 0 mass % and 5.0 mass % or less in total in the entire iron-based alloy; and a rest of the iron-based alloy is Fe and incidental impurities,   wherein a content of Ni in a local region of the iron-based alloy is more than 0.2 mass % and less than 21 mass %, and   wherein a relative density is 97% or more.   
     
     
         2 . The sintered material as claimed in  claim 1 , wherein the content of Ni in the entire iron-based alloy is more than 2 mass % and less than 8 mass %. 
     
     
         3 . The sintered material as claimed in  claim 1 , further comprising:
 oxygen of a content of less than 3000 mass ppm.   
     
     
         4 . The sintered material as claimed in  claim 1 , further comprising:
 tissue made of martensite.   
     
     
         5 . The sintered material as claimed in  claim 1 ,
 wherein the content of Ni in the entire iron-based alloy is more than 2 mass % and less than 8 mass %, and   wherein a content of oxygen is less than 3000 mass ppm.   
     
     
         6 . The sintered material as claimed in  claim 1 , further comprising:
 tissue made of martensite,   wherein the content of Ni in the entire iron-based alloy is more than 2 mass % and less than 8 mass %, and   wherein a content of oxygen is less than 3000 mass ppm.   
     
     
         7 . The sintered material as claimed in  claim 2 , wherein the content of Ni in the entire iron-based alloy is more than 4 mass % and less than 6 mass %. 
     
     
         8 . The sintered material as claimed in  claim 3 , wherein the content of oxygen is less than 2000 mass ppm. 
     
     
         9 . The sintered material as claimed in  claim 1 , wherein the content of C in the entire iron-based alloy is 0.2 mass % or more and 0.8 mass % or less. 
     
     
         10 . The sintered material as claimed in  claim 1 ,
 wherein the content of Mo in the iron-based alloy is 0.15 mass % or more and 0.8 mass % or less, and   wherein the content of Mn in the entire iron-based alloy is 0.15 mass % or more and 0.8 mass % or less.   
     
     
         11 . The sintered material as claimed in  claim 1 , wherein the content of N in the local region of the iron-based alloy is 1 mass % or more and 12 mass % or less.