回火温度对2.25Cr-1Mo-0.25V钢粒状贝氏体显微组织和力学性能的影响

发布时间：2018-05-03 12:16

  本文选题：.Cr-Mo-.V钢 + 粒状贝氏体　； 参考：《金属学报》2015年08期

【摘要】：利用纳米压痕仪,OM,SEM,TEM,XRD,EPMA等设备研究了加氢反应器用2.25Cr-1Mo-0.25V钢正火态粒状贝氏体组织及力学性能随回火温度的变化.结果表明,2.25Cr-1Mo-0.25V钢正火后得到由贝氏体铁素体、马氏体和残余奥氏体岛(M-A岛)组成的粒状贝氏体组织.纳米压痕测量结果表明,由于M-A岛中富集C,其硬度显著高于贝氏体铁素体.在回火过程中,M-A岛分解和贝氏体铁素体软化的综合作用导致了2.25Cr-1Mo-0.25V钢在-18℃的冲击功随着回火温度的升高先增加后减少.除了铁素体基体回复再结晶软化效应外,粒状贝氏体组织中硬相M-A岛回火转变程度以及析出碳化物形貌、尺寸和分布是影响2.25Cr-1Mo-0.25V钢冲击韧性的关键因素.
[Abstract]:The effect of tempering temperature on the microstructure and mechanical properties of normalizing granular bainite of 2.25Cr-1Mo-0.25V steel used in hydrogenation reactor was studied by means of nano-indentation apparatus. The results show that the granular bainite structure composed of bainite ferrite, martensite and residual austenite island is obtained after normalizing 2.25Cr-1Mo-0.25V steel. The results of nano-indentation measurement show that the hardness of M-A island is significantly higher than that of bainitic ferrite due to the rich C in M-A island. The combined effect of decomposition of M-A island and bainitic ferrite softening during tempering resulted in the increase of impact energy of 2.25Cr-1Mo-0.25V steel at -18 鈩，

本文编号：1838449