衣海龙,龙雷周,刘振宇,王国栋

• 1:东北大学轧制技术及连轧自动化国家重点实验室

摘要(Abstract)：

对一种Mo-Ti微合金钢进行了热轧实验,研究了不同工艺条件下的组织特征、析出行为及低温冲击性能。结果表明,随着终轧温度及终冷温度的降低,实验钢的屈服强度和抗拉强度均有所升高;当终轧温度较高时,细小的析出物主要在冷却及模拟卷取过程中产生,当终轧温度较低时,细小的析出物主要由应变诱导析出及冷却、模拟卷取过程的析出物组成;实验钢的组织以铁素体为主,随着终轧温度及终冷温度的降低,晶粒尺寸明显细化,同时,组织中渗碳体及钛的碳化物等岛状物的尺寸也变小,大角度晶界比例增加,低温冲击裂纹由脆性断裂变为韧性断裂;当终轧温度为800~810℃,终冷温度分别为615℃和500℃时,实验钢的屈服强度分别为738 MPa及768 MPa,抗拉强度分别为857 MPa和872 MPa,伸长率为18%~19%,其韧脆转变温度低于-70℃,实验钢具有良好的强度及韧性指标。

关键词(KeyWords)： Mo-Ti微合金钢;铁素体;析出物;韧脆转变温度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51104046);; 中央高校基本科研业务费资助(N120407001)

作者(Author): 衣海龙,龙雷周,刘振宇,王国栋

DOI: 10.13289/j.issn.1009-6264.2015.12.025

参考文献(References)：

• [1]刘爽,唐广波,李激光,等.超高强度钢中复合MC型颗粒的沉淀析出及强化机制[J].钢铁,2014,49(3):68-73.LIU Shuang,TANG Guang-bo,LI Ji-guang,et al.Strengthening mechanism and precipitation of complex MC particles in ultra-high strength steel[J].Iron and Steel,2014,49(3):68-73.
• [2]孙超凡,蔡庆伍,武会宾,等.轧制工艺对铁素体基Ti-Mo微合金钢纳米尺度碳氮化物析出行为的影响[J].金属学报,2012,48(12):1415-1421.SUN Chao-fan,CAI Qing-wu,WU Hui-bin,et al.Effect of controlled rolling processing on nanometer-sized carbonitride of Ti-Mo ferrite matrix microalloyed steel[J].Acta Metallurgica Sinica,2012,48(12):1415-1421.
• [3]衣海龙,龙雷周,刘振宇,等.Ti-Mo微合金钢铁素体中的析出物[J].材料热处理学报,2015,36(3):56-61.YI Hai-long,LONG Lei-zhou,LIU Zhen-yu,et al.Precipitation in ferrite of Ti-Mo microalloyed steel[J].Transactions of Meterials and Heat Treatment,2015,36(3):56-61.
• [4]衣海龙,杜林秀,王国栋,等.一种新型含钛高强度钢[J].机械工程学报,2008,44(8):50-54.YI Hai-long,DU Lin-xiu,WANG Guo-dong,et al.New Ti-bearing high strength steel[J].Journal of Mechanical Engineering,2008,44(8):50-54.
• [5]Pereloma E V,Timokhina I B,Russell K F,et al.Characterization of clusters and ultrafine precipitates in Nb-containing C-Mn-Si steels[J].Scripta Materialia,2006,54:471-476.
• [6]Jung J G,Park J S,Kim J Y,et al.Carbide precipitation kinetics in austenite of a Nb-Ti-V microalloyed steel[J].Materials Science and Engineering A,2011,528:5529-5525.
• [7]Chen C Y,Chen H W,Kao F H,et al.Precipitation hardening of high strength low alloy steels by nanometers-sized carbides[J].Materials Science and Engieering A,2009,499:162-166.
• [8]Jang J H,Lee C H,Heo Y U,et al.Stability of(Ti,M)C(M=Nb,V,Mo and W)carbide in steels using first principles calculations[J].Acta Materialia,2012,60:208-217.
• [9]Funakawa Y,Shiozaki T,Tomita K,et al.Development of high strength hot rolled sheet steel consisting of ferrite and nanometer sized carbides[J].ISIJ International,2004,44(11):1945-1951.
• [10]HAN Y,SHI J,XU L,et al.Effect of hot rolling temperature on grain size and precipitation hardening in a Ti-microalloyed low carbon martensitic steel[J].Materials Science and Engineering A,2012,553:192-199.

文章评论(Comment)：