磁性测量的高温蠕变状态参数化表征  

Magnetic characterization of creep at elevated temperature

作　　者：辛甜[1] 刘新宝[1] 朱麟[1] 潘成飞 

机构地区：[1]西北大学化工学院,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2016年第6期852-856,共5页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51371142)

摘　　要：为了对服役构件的蠕变损伤进行快速准确评估,利用磁滞回线检测技术,对9Cr-1Mo钢在620℃、145MPa条件下的不同蠕变损伤状态进行参数化表征,探讨了磁性参数矫顽力(HC)和剩磁(Mr)随蠕变时间的变化规律。在此基础上,对蠕变损伤试样进行金相观察,研究了不同蠕变状态下9Cr-1Mo钢的微观组织演化过程。结果表明:矫顽力和剩磁与9Cr-1Mo钢蠕变损伤过程中的位错,碳氮化物与析出相的演化有密切的关系,从而进一步说明磁滞回线检测技术在9Cr-1Mo钢蠕变状态及寿命预测研究中具有重要意义。In order to evaluate the creep damage of in-service components, the hysteresis loop measurement technology was used to characterize the creep behavior of 9Cr-1Mo steel under the condition of 620℃ under 145MPa. The relation of coercivity （ Hc ） and remanence （Mr） versus creep time was studied in deail. Based on these results, the microstructure evolution of 9Cr-lMo steel under different creep conditions was observed by optical microscope. The results showed that the coercivity and remanence correlated significantly with the microstructure evolution during creep damage, such as dislocations, carbides and precipitated phases, which further indicated the hysteresis loop measurement technology can provide a potential method to predict the creep states and creep rupture time of 9Cr-lMo steel.

关 键 词：9CR-1MO钢 磁滞回线 矫顽力 剩磁 内部组织演化 蠕变寿命 

分 类 号：TG144[一般工业技术—材料科学与工程]