连续退火工艺对440 MPa级含La高强IF钢组织和性能的影响  

Effect of continuous annealing on microstructure and properties of 440 MPa grade high strength IF steel containing lanthanum

作　　者：任志恒 任慧平 金自力[2] 李玮[2] Ren Zhiheng;Ren Huiping;Jin Zili;Li Wei(Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource,Baotou Inner Mongolia 014010,China;School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China)

机构地区：[1]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《金属热处理》2020年第2期76-81,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(50761005);内蒙古自治区科技重大专项(0902061701)。

摘　　要：通过用热模拟试验机对440 MPa级含La高强IF钢经过不同连续退火工艺下的组织、析出物和性能进行研究,分析了连续退火工艺对组织和性能的影响。结果表明:440 MPa级含La高强IF钢在连续退火过程中,在800℃,120 m/min的退火工艺下能发生完全再结晶,并且提升退火板带的运行速度能有效的细化晶粒,减少Fe Ti P的析出并优化织构,从而提升板材的硬度和深冲性能,得到合格产品。Microstructure,precipitates and properties of 440 MPa grade high strength IF steel containing lanthanum under different continuous annealing conditions were studied by thermal simulation tester. The influence of continuous annealing process on the microstructure and properties of the tested steel was analyzed. The results show that,under the continuous annealing process of 800 ℃ -120 m/min,complete recrystallization occurs,the grain size is refined effectively by increasing the running speed of the strip,the precipitation of Fe Ti P is reduced,and the texture is optimized,thereby improving the hardness and deep drawing properties of the sheet then obtaining qualified products.

关 键 词：高强IF钢 LA 连续退火 织构 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]