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采用金相显微镜和QUANTA-400环境扫描电子显微镜观察了9Cr2Mo钢和GCr15钢贝氏体组织形貌,探讨了贝氏体碳化物的形成机理。结果表明,9Cr2Mo钢和GCr15钢上贝氏体碳化物呈长短不一的薄片状或短棒状,分布在铁素体亚片条或亚单元之间,排列与贝氏体铁素体片条轴向大体上平行分布;下贝氏体碳化物呈细片状或纤维状等形状,分布在铁素体片中间,大多数与片条的主轴方向交角排列,但角度不等。贝氏体碳化物在γ/α相界面上形核,向奥氏体中和铁素体亚单元间长大,是以原子热激活跃迁方式进行的扩散型相变。
The morphology of bainite in 9Cr2Mo steel and GCr15 steel was observed by metallographic microscope and QUANTA-400 environmental scanning electron microscope, and the formation mechanism of bainite carbides was discussed. The results show that the bainite carbides in 9Cr2Mo steel and GCr15 steel are flake or short rod with different lengths distributed between the ferrite sublayers or subunits and aligned with the bainitic ferrite lamellar axis Lower bainite carbide was in the shape of fine or fibrous, distributed in the middle of the ferrite sheet, most of which were arranged at an angle to the major axis of the sheet but with different angles. The bainitic carbides nucleate at the γ / α phase interface and grow up to the austenite neutralization ferrite subunits, which are diffusion-type transformations by atomic thermal activation transition.