45钢筋连接套筒开裂失效分析
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摘要
45钢钢筋连接套筒在使用时开裂,通过扫描电镜、能谱仪、直读光谱仪、光学显微镜和显微硬度计对钢筋连接套筒的断口形貌、化学成分、显微组织和硬度进行了检测分析。结果表明:45钢组织为不均匀的网状铁素体和珠光体,且存在严重的组织缺陷—魏氏组织,成为套筒开裂的主要原因。较多的非金属夹杂物也增加了连接套筒开裂的倾向。通过严格控制原材料品质,对原材料进行正火或退火热处理,消除或改善网状铁素体和魏氏组织,细化晶粒,提高力学性能,可以避免连接套筒在使用时的开裂。
The 45 steel bar connection sleeve cracked in use. The fracture morphology, chemical composition,microstructure and hardness of the steel bar connection sleeve were examined by scanning electron microscope, energy spectrometer, direct reading spectrometer, optical microscope and microhardness meter. The results show that, the 45 steel microstructure is inhomogeneous reticular ferrite and pearlite, and there are serious defects-widmannstatten microstructure,which is the main reason of sleeve cracking. A lot of non-metallic inclusions also increase cracking tendency of the connecting sleeve. By strictly controlling the quality of raw materials, normalizing or annealing the raw materials, it can eliminate or improve the network ferrite and widmannstatten microstructure, refine the grains and improve the mechanical properties, and the cracking of the connecting sleeve can be avoided.
The 45 steel bar connection sleeve cracked in use. The fracture morphology, chemical composition,microstructure and hardness of the steel bar connection sleeve were examined by scanning electron microscope, energy spectrometer, direct reading spectrometer, optical microscope and microhardness meter. The results show that, the 45 steel microstructure is inhomogeneous reticular ferrite and pearlite, and there are serious defects-widmannstatten microstructure,which is the main reason of sleeve cracking. A lot of non-metallic inclusions also increase cracking tendency of the connecting sleeve. By strictly controlling the quality of raw materials, normalizing or annealing the raw materials, it can eliminate or improve the network ferrite and widmannstatten microstructure, refine the grains and improve the mechanical properties, and the cracking of the connecting sleeve can be avoided.
引文
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[3]何成,肖文彬.锅炉炉底水冷壁管爆管分析[J].理化检验(物理分册),2001,37(8):354-356.
[4]王会强,邢艳秋,孙维连,等.空冷器低碳10钢管开裂分析和组织性能[J].材料热处理学报,2014,35(3):68-72.
[5]刘永铨.钢的热处理[M].北京:冶金工业出版社,1987.
[6]崔忠圻.金属学与热处理[M].北京:机械工业出版社,1999.
[7]钟长文,刘建华.45Mn2钢魏氏组织对其力学性能的影响[J].物理测试,2002,20(3):1-2.
[8]罗兆伟.无缝钢管开裂原因及预防措施研究[D].保定:河北农业大学,2014.
[9]张迎晖,赖泓州,赵鸿金.钢中带状组织的研究现状[J].轧钢,2014,31(3):45-48.
[10]罗昌森,罗宏,徐晓东,等.ER55-B6焊丝焊接12Cr1Mo V耐热钢的组织与断口形貌[J].热加工工艺,2011,40(21):124-126.
[11]王秉新,徐旭东,刘相华,等.奥氏体变形对22Cr SH齿轮钢连续冷却相变的影响[J].材料科学与工艺,2005,13(6):572-575.
[12]孙建春,任正德,陈登明.HRB335钢热轧开裂原因的研究[J].热加工工艺,2011,40(6):193-195.
[13]胡进.45钢魏氏组织高温实时形成研究及工艺控制[J].特钢技术,2012,18(4):29-32.
[14]曾松盛,梁武,成小军,等.Q235B钢热轧板带孔洞及边裂缺陷成因分析[J].理化检验(物理分册),2012,48(4):275-278.
[15]陈红,陈伟,吴光耀,等.Q235热轧板带孔洞缺陷成因分析及控制[J].四川冶金,2013,35(1):46-51.