H级高强防腐抽油杆用钢的过冷奥氏体连续冷却转变  

Continuous cooling transformation of undercooled austenite of steel for H-grade high-strength anti-corrosive sucker rod

作　　者：孙晓冉 郑文跃 孙岩 白丽娟 丁辉 Sun Xiaoran;Zheng Wenyue;Sun Yan;Bai Lijuan;Ding Hui(National Center for Materials Sevice Safely,University of Science and Technology Beijing,Beijjing 100083,China;HBIS Group Technology Research Institute,hijiazhuang Hebei 050000,China;HBIS Group Shi Steel Company,Shijazhuang Hebei 050000,China)

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083 [2]河钢集团钢研总院,河北石家庄050000 [3]河钢集团石钢公司,河北石家庄050000

出　　处：《金属热处理》2021年第3期121-124,共4页Heat Treatment of Metals

摘　　要：采用DIL805L淬火膨胀仪,研究了H级高强防腐抽油杆用钢过冷奥氏体连续冷却转变过程中,冷速对显微组织和硬度的影响。结果表明:该试验钢在连续冷却过程中,CCT曲线呈现明显的整体右移现象,珠光体转变非常少,铁素体-珠光体转变区与贝氏体-马氏体转变区分离。硬度随冷速变化呈现两个阶段:包括低冷速下的快速增长和高冷速下的趋于稳定,这与微观组织的变化趋势有关。冷速<1.5℃/s时,组织中才能存在贝氏体,该试验钢想要获取优良的贝氏体组织,可选择的冷速区间范围非常小,该试验研究可为抽油杆用钢的组织控制、工艺制定提供有效的技术支撑。Effect of cooling rate on microstructure and hardness of steel for H-grade high-strength anti-corrosiue sucker rod during undercooled austenite continuous cooling transformation was studied by means of a DIL805L quenching dilatometer.The results show that the CCT curves show an obvious overall rightward shift and with very little pearlite transformation,and the ferrite-pearlite transformation zone is completely separated from the bainite-martensite transformation zone during the continuous cooling process of the tested steel.The hardness change with the cooling rate is divided into two stages,including rapid increasing at low cooling rate and tending to be stable at high cooling rate,which is related to the changing trend of microstructure.Bainite starts to form when the cooling rate is less than 1.5℃/s.In order to obtain excellent bainite structure,the selectable cooling rate range is very small.The experimental research can provide effective technical support for the microstructure control and process formulation of sucker rod steel.

关 键 词：H级高强防腐抽油杆钢 CCT曲线 硬度 微观组织 

分 类 号：TG142.41[一般工业技术—材料科学与工程]