650℃持久对HR3C耐热钢析出相的影响  

Effect of creeping at 650 ℃ on precipitates of HR3C heat-resistant steel

作　　者：杨亚红[1] 朱丽慧[1] 姜筠[1] 王起江[2] 朱长春 

机构地区：[1]上海大学上海市现代冶金及材料制备重点实验室,上海200072 [2]宝山钢铁股份有限公司,上海201900 [3]宝钢特种材料有限公司,上海200940

出　　处：《材料热处理学报》2013年第S2期106-110,共5页Transactions of Materials and Heat Treatment

基　　金："十二五"国家科技支撑计划(2011BAK06B04);国家自然科学基金(51171097)

摘　　要：采用扫描电镜和透射电镜观察了HR3C钢在650℃持久试验前后的微观组织,并探讨了持久过程中析出相变化对硬度的影响。结果表明:供应态HR3C钢的基体为奥氏体,存在大量孪晶及少量一次NbCrN和MX相。持久过程中析出二次触须状NbCrN和M23C6。持久初期,触须状NbCrN和M23C6的析出使得HR3C钢的硬度快速上升。持久1608 h后,不断增加的触须状NbCrN是硬度继续上升的主要原因。4203 h后,M23C6的粗化使得硬度开始下降。Microstructure of HR3C steel before and after creeping at 650 ℃ was investigated by SEM and TEM,and the effect of the precipitates on hardness of the steel was discussed. The results show that the microstructure of HR3C steel is austenite,and there are some precipitates and a large number of twins in the austenite matrix. The main precipitation particles in the as-supplied HR3C steel are primary NbCrN and MX. A large amount of secondary whisker-like NbCrN and M23C6 precipitates during creeping. The precipitation of whisker-like NbCrN and M23C6 plays an important role in the significant increasing of the hardness at the beginning of creeping. After creeping for 1608 h,the increasing of fine whisker-like NbCrN ensures the continuous increase of hardness. When the creeping time prolongs to 4203 h,the hardness begins to decline due to the coarsening of M23C6.

关 键 词：HR3C耐热钢 高温持久 组织 力学性能 强化机理 

分 类 号：TG142.73[一般工业技术—材料科学与工程]