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作 者:郑万[1,2] 寇锦荣 李烈军[3] 王冠 万翔 刘辰生 ZHENG Wan;KOU Jin-rong;LI Lie-jun;WANG Guan;WAN Xiang;LIU Chen-sheng(The State Key Laboratory of Refractories and Metallurgy,W uhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,wuhan University of Science and Technology,wuhan 430081,Hubei,China;National Engineering Research Center for Near Net Forming of Metal Materials,South China University of Technology,Guangzhou 510000,Guangdong,China;Guangdong Shaogang Songshan Co.,Ltd.,Shaoguan 512000,Guangdong,China)
机构地区:[1]武汉科技大学耐火材料与冶金国家重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081 [3]华南理工大学国家金属材料近净成形工程技术研究中心,广东广州510000 [4]广东韶钢松山股份有限公司,广东韶关512000
出 处:《钢铁》2022年第8期94-102,共9页Iron and Steel
基 金:国家自然科学基金资助项目(52174323)。
摘 要:降低含铌低合金钢铸坯的裂纹敏感性,是实现热装热送工艺的必要条件,采用超高温激光共聚焦显微镜(HT-CLSM)、透射电镜(TEM)等手段研究了钛含量不同的含铌低合金钢(Q390、Q390GJD)高温铸坯的晶粒度及析出物特征,旨在揭示微钛固氮降低含铌钢皮下裂纹敏感性的机理。热力学计算与TEM检测结果表明,增加钢中钛质量分数(由0.010%上升到0.023%)提高了氮化钛粒子的析出温度(大于1400℃),高温析出细小弥散的氮化钛粒子可钉扎奥氏体晶界,细化高温铸坯的晶粒度(由4级变成6.5级),晶粒尺寸降低了约44%,使高温铸坯的裂纹敏感性明显降低;氮化钛粒子优先析出固氮降低了铌碳氮化物、氮化铝的开始析出温度,并作为异质形核核心,抑制了铌、铝析出物在晶界析出概率,降低了析出物脆化晶界的危害。通过微钛固氮调控氮化物的析出温度、析出位置及细化晶粒的作用,有效降低了含铌钢第三脆性温度槽的宽度和深度,同时,高温抗拉强度提高了21.3%~27.5%,铸坯皮下裂纹发生率降低了80%以上。为了避免析出物的晶界链状析出导致含铌钢铸坯热装轧制裂纹,应将其钛质量分数控制在0.015%~0.020%的合理范围。Reducing the crack sensitivity of Nb containing low alloy steel slabs is a necessary condition of the advanced process of hot delivery and hot charging of steel slabs with lower fuel consumption and emission reduction.The grain size number and precipitate characteristics of Nb bearing low alloy steel slab with different titanium content were comparative studied by ultra-high temperature confocal laser scanning microscope(HT-CLSM)and transmission electron microscope(TEM),in order to reveal the mechanism of reducing the crack sensitivity of Nb containing low alloy steel by nitrogen fixation with titanium alloying.Thermodynamic calculations and TEM results of precipitates in Nb containing low alloy steel slabs show that increasing the titanium content(from 0.010%to 0.023%)enhances the precipitation temperature of titanium nitride particles(more than 1400℃),which reduces the grain size of the steel by about 44%(from grade 4 to grade 6.5)by pinning the austenite grain boundaries,resulting in a significant reduction in the crack susceptibility of the high-temperature cast billets.The preferential precipitation titanium nitride particles can fixing nitrogen element to reduce the precipitation temperature of niobium-carbon nitride and aluminum nitride,and act as a heterogeneous nucleation core of nitride precipitates of niobium and aluminum to inhibit their precipitation at the grain boundary,which reduces the risk of grain boundary embrittlement of the Nb bearing low alloy steel.Modulation of nitride precipitate behavior by nitrogen fixation with titanium microalloying and grain refinement of the Nb bearing low alloy steel effectively reduced the width and depth of the third embrittlement temperature groove and increased the high temperature tensile strength by 21.3%-27.5%of niobium-containing steels,resulting in reduction of the incidence of subcutaneous cracking in cast billets by more than 80%.Controlling the titanium content in the range of 0.015%to 0.020%niobium-containing low-alloy steels can effectively avoid g
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