锆含量对高强韧Ti-Zr微合金化钢奥氏体组织的影响  

Effect of Zr content on austenite microstructure of high-strength and high-toughness Ti-Zr microalloyed steel

作　　者：王俊彩 曹建春[1] 曾敏 罗瀚宇 汪创伟 叶晓瑜 WANG Jun-cai;CAO Jian-chun;ZENG Min;LUO Han-yu;WANG Chuang-wei;YE Xiao-yu(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Panzhihua Iron and Steel Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,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]攀钢集团攀枝花钢铁研究院有限公司,四川攀枝花617000

出　　处：《钢铁》2023年第1期133-140,共8页Iron and Steel

基　　金：国家自然科学基金资助项目(51761019)。

摘　　要：为了满足各行业对钢铁材料提出的更高强度、更好韧性的要求,在钢中加入适量的微合金化元素并结合合理的控扎控冷工艺,有利于在高温轧制阶段获得细小均匀的奥氏体再结晶晶粒,这是提高钢材强度及韧性的有效途径之一。通过Gleeble-3800型热模拟试验机,对两种不同锆含量的低碳微合金Ti-Zr钢进行多道次压缩变形试验,模拟实际轧制情况,研究试验钢在不同锆含量和不同变形方式(等温变形和变温变形)下的热变形行为,并结合组织观察分析讨论了锆含量和变形条件对试验钢奥氏体组织细化行为和析出行为的影响。结果表明,变形温度的升高可以降低高锆钢各道次的流变应力。变温变形条件下,锆含量的升高会提高试验钢各道次的流变应力;奥氏体再结晶晶粒会随着锆含量的升高和变形温度的降低而发生细化,采用变温变形方式比等温变形方式更有利于得到细小的奥氏体晶粒,高锆钢在1050℃→125℃→1000℃变温变形后得到了最小的奥氏体平均晶粒尺寸(为8.2μm);锆含量升高会提高试验钢中析出相的数量,变形方式对析出相数量的影响不大,变形温度的升高会使析出相发生粗化。锆含量增加所导致的形变诱导析出相的增多,以及变温变形过程中温度的降低,起到了抑制奥氏体晶粒长大的作用,细化了奥氏体再结晶晶粒,对提高钢材的强度及韧性起到了有利作用。In order to meet the requirements of various industries for steel materials with higher strength and better toughness,adding the right amount of micro-alloying elements in the steel and combining with a reasonable control of tying and cooling process is conducive to obtaining fine and uniform austenite recrystallization grains in the high temperature rolling stage,which is one of the effective ways to improve the strength and toughness of steel.This paper simulates the actual rolling of two Ti-Zr microalloyed low carbon steels with different Zr contents by multiple passes of compression deformation on a Gleeble-3800 thermal simulation experimental machine,the thermal deformation behavior of the test steels under different Zr contents and different deformation methods(isothermal deformation and variable temperature deformation)was studied,as well as the effects of Zr contents and deformation conditions on the austenite organization hyperfine behavior and precipitation behavior of the test steels.The results show that the increase of deformation temperature can reduce the rheological stress of high Zr steel in all passes.Under variable temperature deformation conditions,the increase in Zr content raises the rheological stress in each pass of the test steel;austenite grains will be refined with the increase of Zr content and the decrease of deformation temperature,the use of variable temperature deformation method is more favorable than isothermal deformation method to obtain fine austenite grains,high Zr steel at 1050℃→125℃→1000℃variable temperature deformation obtained the smallest average austenite grain size(for 8.2μm);the increase in Zr content increases the number of precipitation in the test steel.the deformation method has little effect on the number of precipitations,and the increase in deformation temperature causes the precipitation to grow.The increase of deformation-induced precipitation caused by the increase of Zr content and the decrease of temperature in the process of deformation of vari

关 键 词：微合金钢 ZR含量 奥氏体 析出相 晶粒尺寸 

分 类 号：TG142.1[一般工业技术—材料科学与工程]