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《Physical Testing and Chemical Analysis Parta Physical Testing》 2003-01
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CHU Shu-jun, LU Yue-shen (Jinan No.2 Machine Tool Group CO.,LTD, Jinan 250022, China)  
The crack in quenching boundary of the hydraulic press plunger surface was analyzed by means of chemical composition analysis, microstructure examination and microhardness testing. The results showed that the tearing tendency was increased and the mechnical property was decreased due to high carbon content, coarse grain and zonal structure. The quenching crack was caused by the stress superposition which exceed the limitation of the tensile strength of the material.
【CateGory Index】: TG156.3
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