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ANALYSIS SPLITTING CRACK OF CRASKER MAIN-SHAFT

WANG Chang-chun,ZHAO Jian-hua(Guangdong Provice Shaoguan Foundry and Forqing Group Co.Ltd.,Shaoguan 512031,China)  
The main-shaft of crusher split suddenly during heat-treatment and wait to temper.In order to find the failure causes,its macroscopic fracture appearance,microstuctures were examined.The results show that the main cause of splitting was the high stress introduced by heat-treatment and temper not in time.Other cause was coarse orborescent crystal and segregation in original material.The suggestions method were proposed on the process of heat-tretament and inspection of original material.
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