铝硅合金壳体的开裂失效分析  

Failure Analysis on Cracking of Aluminum-Silicon Alloy Shell

作　　者：闫富华[1] 袁满[1] 祁晨 李宁[1] 周凡[1] 周茜 赵教育[1] YAN Fuhua;YUAN Man;QI Chen;LI Ning;ZHOU Fan;ZHOU Qian;ZHAO Jiaoyu(CSIC No.12 Research Institute,Xingping 713102,China)

机构地区：[1]中国船舶重工集团公司第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2023年第9期160-162,共3页Hot Working Technology

摘　　要：利用体视显微镜、扫描电子显微镜、能谱仪和显微硬度计对开裂的铝硅合金壳体的断口形貌、显微组织、微区成分和显微硬度进行了分析。结果表明:铝硅合金壳体断裂方式为脆性开裂;铝硅合金中存在较多的针孔缺陷,组织变质不足,组织中有较多的针状相,使铸件的塑性降低,导致壳体脆性开裂。Fracture morphology,microstructure,micro-area composition and micro-hardness were analyzed by means of stereo microscopy,scanning electron microscopy,energy dispersive spectroscopy and micro-hardness tester.The results indicate that the fracture mode of aluminum-silicon alloy shell is brittle cracking.There are many pinhole defects in the aluminum-silicon alloy,the modification of the microstructure is insufficient,and there are many acicular phases in the microstructure,which reduces the plasticity of the casting,resulting in the shell body brittle cracking.

关 键 词：铝硅合金 开裂 针状相 针孔 

分 类 号：TG292[金属学及工艺—铸造]