摘要
为了研究TP347H钢在固溶过程中的微观组织演变规律,采用激光共聚焦显微镜对其在1 100、1 150和1 200℃下固溶处理时的组织演变过程进行了原位观察,结合扫描、金相和Thermo-Calc热力学计算软件对其中的析出相进行观察与分析。结果表明,TP347H钢中的含铌析出相以Nb（C,N）的形式析出,随着温度升高,Nb（C,N）析出相摩尔分数会减少;原位观察发现,在固溶处理过程中试验钢中存在小尺寸二次Nb（C,N）析出相的析出-溶解行为,并且原始态存在的一次Nb（C,N）析出相不会发生溶解;随着固溶温度的升高,二次Nb（C,N）析出相大量回溶,导致晶粒尺寸长大速度加快。晶粒以晶粒合并和晶界迁移两种形式长大。
To investigate the microstructure evolution regularity of the TP347 H stainless steel in the process of solid solution,the isothermal microstructure evolution of TP347 H stainless steel at 1 100,1 150 and 1 200 ℃ was observed in situ using confocal scanning laser microscope（CSLM）. The characteristic of precipitates in TP347 H was analyzed by SEM and OM,calculated by Thermo-Calc thermodynamic calculation software. The results showed that Nb（C,N）phase precipitated in the TP347 H stainless steel during the heat treatment and the mole fraction of Nb（C,N）phase decreased with the increasing of solid solution temperature. The smaller secondary Nb（C,N）could dissolve and precipitate in the process of solid solution treatment,while the primary Nb（C,N）phase would not change. As solid solution temperature increased,the grain size increased quickly,which owed to the re-dissolution of secondary Nb（C,N）. The main way of grain growth were the merging of grains and the grain boundary migration.
作者
张志锋
白银
吕知清
包汉生
ZHANG Zhi-feng1,2, BAI Yin2, LV Zhi-qing1, BAO Han-sheng2(1. Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, Chin)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第3期57-65,共9页
Iron and Steel
基金
国家重点研发计划资助项目(2017YFB0305203)
