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THE FRACTURE ANALYSIS OF THE HIGH STRENGTH STUD BOLT BY SEM

XU Hong-fei,ZHANG Yong-xin,LI Gui-cai,XUE Yue-jun,ZHAI Jing(No.52 Institute of China Ordnance Industry,Yantai Brach,Yantai 264003,China)  
Based on the microanalyse,the fracture of the high strength stud bolt was analyzed by scanning electron microscope(SEM).It was observed that the tramp elements in the fire-proof material particles have separated out to the crystal boundary so that lead to local brittle crystal boundary,therefore the stud bolt was broken under small stress conditions.
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