2.25Cr-1Mo-0.25V低合金耐热钢中贝氏体的形成机制研究  

Bainite Formation Mechanism of 2.25Cr-1Mo-0.25V Low-alloyed Heat Resistant Steel

作　　者：张永涛[1] 胡朝备[2] 陈映川[1] 黄丽琴[1] 李建新[1] 尚海龙[1] 

机构地区：[1]上海电机学院机械工程学院,上海200245 [2]燕山大学机械工程学院,秦皇岛066004

出　　处：《材料导报》2013年第20期106-109,共4页Materials Reports

基　　金：上海市教委科研创新项目(12YZ181);上海高校青年教师培养资助计划项目(shdj003);上海电机学院科研启动项目(11C419);上海电机学院校重点学科资助(09XKJ02);上海高校知识服务平台(ZF1225)

摘　　要：采用真空冶炼炉和可逆式轧机制备出试验材料,将其在940℃奥氏体化后分别水淬到550℃、650℃和750℃,再空冷至室温,然后采用扫描电镜和透射电镜观察材料的显微组织,发现分别主要为下贝氏体、上贝氏体和粒状贝氏体。上贝氏体组织和下贝氏体组织均以扩散机制形成,而区域冷却速率的差异是造成粒状贝氏体组织基体形貌差异的主要原因。The experimental material was prepared by using vacuum melt furnace and reversing mill. After aus- tenization at 940 ~C, the hot-rolled samples were quenched to 550 ℃, 650 ℃ and 750 ℃ respectively and then air cooled to room temperature. Using SEM and TEM, the microstructures of specimen were determined to be lower bai- nite, upper bainite and granular bainite, respectively. The upper bainite and the lower bainite both formed as diffusion mechanisms and specially, the different cooling rate of regions was the main reason for the morphological differences o~ granular bainite matri~

关 键 词：2 25Cr-1Mo-0 25V钢 加速冷却 贝氏体 形成机制 

分 类 号：TG142.2[一般工业技术—材料科学与工程]