【摘要】 本文探讨了层状碳化物的形态,晶体学特征,析出原因及动力学,以及对HK40合金高温性能的影响。试验结果表明,层状碳化物为板条状M₂₃C₆,与基体的位向关系是, {001}M₂₃C₆∥{001}γ,<001>M₂₃C₆∥<001>γ。层状M₂₃C₆析出的含氮量极限为0.065～0.075%.层状M₂₃C₆胞晶平均生长速度G主要受碳的扩散控制。高温持久实验表明,层状M₂₃C₆的析出对合金的高温持久强度是有害的。更多还原

【Abstract】 In this paper, the morphology of lamellar carbide, crystallogical charcteristics, the dynamics of lamellar precipitation and the high temperature properties of HK40 alloy were studied. It was shown that the lamellar precipitates are lath carbides M₂₃C₆ and the orientation relationship between the austenitic matrix and the lamellar M₂₃C₆ are:{001}M₂₃C₆∥{001}γ, <001>M₂₃C₆∥<001>γ, The limit content of nitrogen during lamellar M₂₃C₆ precipitated is 0.065 to 0.075% in HK40 alloy and the average migration rate G of the lamellar M₂₃C₆ carbide cell is mainly controlled by the volume diffusion of carbon. Based upon the data of high temperature endurance test, precipitation of lamellar M₂₃C₆ is harmful to the high temperature endurance strength.更多还原