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Influence on the Hardness of 21-4N during the Heat Treatment and Friction Welding

Kaibin etc.  
To settle down the problem of the widely dispersed hardness of 21-4N steel,this paper proceeds the aging treatment of 21-4N steel in the semisolid state,and researches contemporary the change of hardness in the heat influential area generated in friction welding of 4Cr9Si2 and 21-4N steels.The results indicate that not only the hardness problem can be settled down,but also discovers that through partly tempering treatment of the welding rod 4Cr9Si2,we can change the hardness in the heat influential area of 21-4N steel.
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