马氏体不锈钢/Q235复合板显微组织及性能研究

Study on Microstructure and Properties of Martensite Stainless Steel/Q235 Composite Plate

采用熔化极活性气体保护焊(MAG)工艺制备了马氏体不锈钢/Q235复合板,通过添加ER80-G过渡层提高复合板的冲击韧性。采用光学显微镜、显微硬度仪、扫描电镜对复合板的微观组织、显微硬度和冲击断口进行分析。结果表明,试验制备的复合板界面具有良好的冶金结合。高强层由板条马氏体组成,硬度为380~420 HV;过渡层由针状铁素体和细晶铁素体组成,硬度为240 HV。添加过渡层的复合板室温冲击功为61.6 J,未添加过渡层的复合板冲击功为38.2 J,与未添加的复合板相比,添加过渡层的复合板冲击功提高了61%。

Martensitic stainless steel/Q235 composite plates were prepared by melting electrode active gas shielded arc welding(MAG)process.The impact toughness of composite plate was improved by adding ER80-G transition layer.The microstructure,microhardness and impact fracture of the composite plate were analyzed by optical microscope,microhardness instrument and scanning electron microscope(SEM).The results show that,the interface of the composite plate prepared by the experiment has good metallurgical bonding.The high strength layer consists of lath martensite with a hardness of 380-420 HV.The transition layer consists of acicular ferrite and fine grained ferrite with a hardness of 240 HV.The impact energy of composite plate with transition layer is 61.6 J at room temperature and 38.2 J for composite plate without transition layer.Compared with that of the composite plate without transition layer,the impact energy of the composite plate with transition layer increases by 61%.