长时服役后HR3C钢析出相变化及对硬度的影响  

Precipitates change and effect on hardness of HR3C steel after long-term service

作　　者：周江 项国东 徐昶 张显程[2] 夏咸喜 朱保印 赵彦芬[3] 金晓 Zhou Jiang;Xiang Guodong;Xu Chang;Zhang Xiancheng;Xia Xianxi;Zhu Baoyin;Zhao Yanfen;Jin Xiao(Beilun No.3 Power Plant Co.,Ltd.,Ningbo Zhejiang 315824,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Suzhou Nuclear Power Research Institute,Suzhou Jiangsu 215004,China)

机构地区：[1]国电浙江北仑第三发电有限公司,浙江宁波315824 [2]华东理工大学机械与动力工程学院,上海200237 [3]苏州热工研究院有限公司,江苏苏州215004

出　　处：《金属热处理》2023年第9期203-207,共5页Heat Treatment of Metals

基　　金：广东省基础与应用基础研究重大项目(2019B030302011);国家自然科学基金(U21B2076)。

摘　　要：采用扫描电镜(SEM)、透射电镜等(TEM)和电子背散射衍射(EBSD)等技术对未服役样品和服役时长分别为15 501、35 564、67 705 h的HR3C钢样品进行微观组织结构观察,同时对相应条件下的HR3C钢的硬度进行了测量与分析讨论。结果表明,HR3C钢晶界上出现连续分布且尺寸相近的M_(23)C_(6)相,随着服役时间的增加发展成不均匀的粗化链状结构;同时在晶粒内部出现纳米级的二次NbCrN相和M_(23)C_(6)相,这种纳米级析出相产生的析出强化效应是HR3C钢硬度值增加的主要原因。Scanning electron microscope(SEM),transmission electron microscope(TEM) and electron backscattered diffraction(EBSD) techniques were used to examine the microstructure of the un-serviced HR3C steel specimens and these with service durations of 15 501 h,35 564 h,and 67 705 h,respectively,and hardness of the HR3C steel was measured and analyzed under the corresponding conditions.The results show that the appearance of continuously distributed and similarly sized M_(23)C_(6) phases on the grain boundaries of the HR3C steel developes into an inhomogeneous coarsening chain structure as service time increasing,whereas the appearance of nanoscale secondary NbCrN and M_(23)C_(6) phases in the grain and their resulting precipitation strengthening effects are the main reasons for the significant increase in hardness values of the HR3C steel.

关 键 词：HR3C钢 服役 析出相 硬度 强化机理 

分 类 号：TH142[一般工业技术—材料科学与工程]