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本文对双相钢的断裂特征和精细结构进行了研究。采用反复腐蚀抛光法制样,用扫描电镜观察了双相钢的解理断裂的开裂相和裂纹扩展途径,并得出了双相钢的断裂模式。用双喷射加离子清洗减薄制膜,在透射电镜下观察了马氏体岛和铁素体的精细结构。结果指出:马氏体岛的精细结构与临界间退火温度有关,较低的临界间退火温度,马氏体岛的亚结构以孪晶马氏体为主,不过这种孪晶马氏体的组态在同样含碳量的淬火钢中比较少见。临界间退火温度升高,板条马氏体量增多;在铁素体中有马氏体相变诱发的高密度位错,有时还形成胞状结构。
In this paper, the fracture characteristics and fine structure of duplex steel have been studied. Using repeated corrosion polishing method, the cracking phase and crack propagation path of cleavage fracture of dual phase steel were observed by SEM, and the fracture mode of dual phase steel was obtained. The films were thinned with double jet and ion cleaning, and the fine structure of martensite and ferrite was observed under transmission electron microscope. The results show that the fine structure of martensite island is related to the intercritical annealing temperature. The lower intercritical annealing temperature, the sub-structure of martensite island is twin martensite, but the twin martensite Configuration in the same carbon content of hardened steel is relatively rare. The intercritical annealing temperature increases and the amount of lath martensite increases. High-density dislocations induced by martensitic transformation in ferrite sometimes form a cellular structure.