高强抗震钢筋原位拉伸的微观组织变形机理  

Microstructure deformation mechanism of SEM in-situ tension in high-strength anti-seismic rebars

作　　者：周煌 刘铖霖 曹建春[1] 陈伟 张正云 ZHOU Huang1, LIU Cheng-lin1, CAO Jian-chun1, CHEN Wei2, ZHANG Zheng-yun1(1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; 2. Technology Center, Kunming Iron and Steel Group Co Kunming 650302, Yunnan, China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明钢铁股份有限公司技术中心,云南昆明650302

出　　处：《钢铁研究学报》2018年第10期822-829,共8页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51261009)

摘　　要：为研究不同组织对高强度抗震钢筋性能的影响,得到其微观组织变形行为的规律,针对3种不同组织特征的500MPa级高强度抗震钢筋,其组织分别为铁素体和珠光体、铁素体和珠光体以及少量贝氏体、铁素体和少量珠光体以及大量贝氏体为主,利用原位拉伸仪观察、研究多相微观组织变形行为以及多相组织协调变形机理以及断裂机制。结果表明,铁素体和珠光体为主的试验钢,铁素体和珠光体变形明显,其中铁素体优先变形,但由于贝氏体硬质相对珠光体的阻碍作用,变形不明显,随着变形量的增加,最后导致珠光体的断裂。以铁素体和珠光体以及少量贝氏体为主的试验钢,贝氏体在初期基本不变形,而后对铁素体和珠光体的变形产生阻碍运动,仅发生一定程度的改变。以铁素体和少量珠光体以及大量贝氏体为主的试验钢,变形初期以铁素体变形为主,珠光体因其含量非常低,变形不明显。随变形量的增加,贝氏体的变形越发明显,到一定程度后促使珠光体开始变形,并最后断裂。To study the effect of different tissues on the performance of high-strength anti-seismic rebars, the law of its microstructure deformation behavior was obtained. The microstructures of three kinds of 500 MPa high-strength anti-seismic rebars with different structural features were analyzed, which is mainly pearlite and ferrite, pearlite, ferrite and a small amount of bainite, as well as pearlite, ferrite and a large amount of bainite, respectively. The in-situ tension tests were used to investigate and study the polyphase microstructure deformation, polyphase microstructure coordination deformation mechanism and fracture mechanism. The results indicate that the ferrite and pearlite are deformed obviously in the test steels mainly with ferrite and pearlite. The ferrite is firstly deformed, however, the reason for unobvious deformation in pearlite may be attributed to the hindered effect caused by hard phase bainite. As the amount of deformation increases, the pearlite breaks finally. In the test steels which mainly composed of ferrite, pearlite and a small amount of bainite, the bainite does not substantially deform at the initial stage, while it impedes the deformation of ferrite and pearlite with only a certain degree of deformation. In the test steels which mainly composed of ferrite, a small amount of pearlite and a large amount of bainite, the initial deformation mainly begins in ferrite deformation, while the pearlite deformation is not obvious because of its low content. With the increase in deformation, the deformation of bainite becomes more and more obvious. When it reaches a certain extent, pearlite begins to deform and finally gets fracture.

关 键 词：500 MP级高强抗震钢筋 SEM原位拉伸 贝氏体 铁素体 珠光体 微观组织变形 

分 类 号：TG142.1[一般工业技术—材料科学与工程]