Analysis of Causes of Dense and Small Cracks at the Bottom of a Certain 35CrMnSi Connection
The materials of an ammunition connection was the high quality 35CrMnSi steel bar,dense and small cracks of con-nection were found when doing visual inspection after finish machining of a certain batch,and dense pores was found around cracks,so it was done that chemical analysis,macroscopic tissue detection,and mechanical property test for connections.The results showed that the cracks and pores under connection bottom were caused by overburning of the forging,the quality of 35CrMnSi steel bar used for manufacturing connection bottom was poor,and the sulfur content of steel bar was on the high side,which was the main reason cause overburning of connections.The excess temperature of the forging also caused adverse effect for connection bot-toms.The defects of connection bottoms had no relationship with technology for heating processing.
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