US2020190651A1PendingUtilityA1

METHOD FOR MODIFYING SURFACE OF Co-Cr ALLOY, METHOD FOR MANUFACTURING HIGH FATIGUE STRENGTH Co-Cr ALLOY, AND HIGH FATIGUE STRENGTH Co-Cr ALLOY

Assignee: SINTOKOGIO LTDPriority: Dec 13, 2018Filed: Dec 12, 2019Published: Jun 18, 2020

Est. expiryDec 13, 2038(~12.4 yrs left)· nominal 20-yr term from priority

Inventors:Noriyuki Hisamori Motoki Fukuda Yuta Mizuno Yuji Kobayashi

Y10T29/479C21D 7/06C22F 1/10B24C 1/10

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Abstract

Provided is a method for modifying a surface of a Co-13 Cr alloy to obtain the Co-13 Cr alloy superior in fatigue strength. The method for modifying a surface of a Co-13 Cr alloy, comprising a step of shot peening of the Co-13 Cr alloy using a shot material including ZrO2.

Claims

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What is claimed is: 
     
         1 . A method for modifying a surface of a Co- 13  Cr alloy, comprising a step of shot peening of the Co- 13  Cr alloy using a shot material including ZrO 2 . 
     
     
         2 . The method for modifying a surface of a Co- 13  Cr alloy according to  claim 1 , wherein an average grain size of the shot material is 0.05 to 1.0 mm. 
     
     
         3 . A method for manufacturing a high fatigue strength Co- 13  Cr alloy, comprising a step of shot peening of a Co- 13  Cr alloy using a shot material including ZrO 2 . 
     
     
         4 . The method for manufacturing a high fatigue strength Co- 13  Cr alloy according to  claim 3 , wherein an average grain size of the shot material is 0.05 to 1.0 mm. 
     
     
         5 . A high fatigue strength Co- 13  Cr alloy, wherein an ε-hcp phase gradually increases and a γ-fcc phase gradually decreases from inside to surface. 
     
     
         6 . The Co- 13  Cr alloy according to  claim 5 , wherein a Vickers hardness of the surface is 500 or more.

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