感应回火对含钒900 MPa级高强钢组织与性能的影响  

Effects of Induction Tempering on Microstructure and Properties of 900 MPa Grade High Strength Steel Containing Vanadium

作　　者：张楠 田志凌[1] 张书彦 潘辉 ZHANG Nan;TIAN Zhiling;ZHANG Shuyan;PAN Hui(Institute of Welding,Central Iron and Steel Research Institute,Beijing 100081,China;Centre of Excellence for Advanced Materials,Dongguan 523808,China;User Technology Institute,Shougang Research Institute of Technology,Beijing 100041,China)

机构地区：[1]钢铁研究总院焊接研究所,北京100081 [2]广东(东莞)材料基因高等理工研究院,广东东莞523808 [3]首钢技术研究院用户技术研究所,北京100041

出　　处：《热加工工艺》2024年第10期83-87,共5页Hot Working Technology

基　　金：广东省“珠江人才计划”引进创新创业团队资助项目(2016ZT06G025);广东省自然科学基金资助项目(2017B030306014)。

摘　　要：对含钒Q960E高强钢进行热轧和900℃淬火,并对其分别在450、550和600℃下进行感应回火处理。通过扫描电子显微镜(SEM)与投射电子显微镜(TEM)研究了Q960E高强钢不同感应回火温度下的组织特征。结果表明:淬火后Q960E钢板组织由马氏体+贝氏体复相组织组成,并通过提高终轧和卷曲温度保证了感应回火前的板形质量。高温回火后组织为回火索氏体。通过V的添加,在感应回火过程中均匀弥散析出尺寸小于100 nm的析出相,保证了感应高温回火后的板材强度,并随回火温度的升高,部分回火马氏体消失,形成回火索氏体组织。在900℃/15 min淬火,(550~600℃)/15 min高频感应回火可以获得Q960E的最佳力学性能,通卷横向强度波动小于10 MPa,通卷纵向强度波动范围小于30 MPa,通卷横、纵向伸长率稳定在12%以上。The high strength steel containing vanadium Q960E was hot-rolled and quenched at 900℃,and it was subjected to induction tempering at 450,550 and 600℃,respectively.By means of scanning electron microscope(SEM)and projection electron microscope(TEM),the microstructure characteristics of Q960E steel at different temperature of induction tempering were studied.The results show that the microstructure of Q960E steel plate after quenching is martensite+bainite complex structure,and the shape quality before induction tempering is ensured by increasing the final rolling and crimping temperature.After high temperature tempering,the microstructure is tempered sorbite.By the addition of V,the precipitate phase of<100 nm is uniformly dispersed during the induction tempering process.The plate strength after induction high temperature tempering is guaranteed.And with the increase of tempering temperature,the partial tempering martensite disappears and the tempering sorbite structure is formed.The best mechanical properties of Q960E can be obtained by high frequency induction tempering at 900℃/15 min,(550-600℃)/15 min,the transverse strength fluctuation of the pass coil is<10 MPa,and the longitudinal strength fluctuation range of the pass coil is<30 MPa.Transverse and longitudinal elongation are stable at more than 12%.

关 键 词：感应回火 高强钢 析出相 钒 

分 类 号：TG156.5[金属学及工艺—热处理]