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三级钢筋钒合金化的实践与研究刘玉伟1(1.河北省承德市承钢公司炼钢厂)摘 要:承钢冶炼三级钢试验了钒铁,氮化钒和氮化钒铁3种不同的钒合金,钢筋性能均满足用户要求.通过对比分析其成分控制,认为对于钒吸收率,氮化钒铁最高,氮化钒次之,钒铁最低.对比其钢筋性能,在碳当量相同时,认为加氮化钒的钢筋其屈服强度和抗拉强度最高,氮化钒铁次之,钒铁最低,对低成本冶炼三级钢具有指导意义.关键词:三级钢筋； 氮化钒铁； 吸收率； 性能......
棒线材热连轧过程综合数值模拟系统的开发及应用姚俊1,唐广波1,刘正东1,马宝国2(1.北京市钢铁研究总院结构材料研究所2.宝山钢铁股份有限公司)摘 要:为方便考察生产线布置,轧制工艺参数等对棒线材在热连轧生产过程中变形,温度和组织演变的影响,采用Fortran语言编写核心计算模块,SQL Server 2000开发数据库及数据库管理模块,VB语言编写人机交互界面,开发了棒线材热连轧过程综合数值模拟系统.利用开发的系统针对宝山钢铁股份有限公司特殊钢分公司棒材生产线生产GCr15轴承钢棒材的实际工艺参数进行了计算,......
flexible steel cables were adopted to capture the payload with large capture allowance. Ball screw transmission mechanism and plane shape-constraint four bar linkage mechanism were utilized to connect...; high stiffness connection; end-effector; flexible steel cable; ball screw; four bar linkage 1 Introduction The international space station (ISS) proposed by US president Reagan has made great success......
含稀土高强度耐腐蚀钢筋的研究郭湛1,完卫国1,孙维1,王向东2(1.安徽省马鞍山市马鞍山钢铁股份有限公司技术中心2.钢铁研究总院 结构所,北京 100081)摘 要:对20MnSiNbRe,20MnSiVNRe两种牌号的含稀土高强度耐腐蚀钢筋进行了研究,介绍了耐腐蚀钢筋的常规力学性能和金相组织,重点论述了实验室盐雾加速腐蚀,周浸加速腐蚀试验以及海洋实物挂片试验,探讨了稀土对提高钢耐腐蚀性能的作用.结果表明:含稀土耐腐蚀钢筋能满足GB 1499.2-2007对HRB400热轧带肋钢筋的常规力学性能要求;与普通钢筋......
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City University, Yiyang 413049, China)Abstract:Acoustic emission tests were performed using a split hopkinson pressure bar system (SHPB) on 50-mm-diameter bars of granite, limestone, sandstone and skarn... with similar frequency characteristics and greater correlation with the waveform obtained from the elastic input bar of the split Hopkinson pressure bar system compared with the waveforms of the other hits......
bar (SHPB) was simulated using commercially available finite element code Abaqus/Explicit. Validation of numerical simulation was carried out using available experimental and numerical results. Full... fly ash foam is sensitive to strain rate. Key words: high strain rate; metal foam; strain rate sensitivity; numerical simulation; split Hopkinson pressure bar 1 Introduction Metal foams had shown many......
and bar 3.2 增长力臂L4对棒料的起裂力和挠度的影响 确定夹持力臂L3为18 mm,补偿器的厚度H为2 mm,此时,增长力臂L4成为影响棒料V型槽尖端应力场的主要因素,要使棒料在最佳的加载力下起裂,并且得到最为稳定的起裂质量,必须确定L4. 由材料力学可知,当L4较大时,较小的加载力F也能在V型槽尖端处产生较大的应力,因此,适当加大L4,保证裂纹在Ⅰ型裂纹形式的扩展[20],有利于实现... between cracking force F and bar deflection of right end of equivalent bar and L4 从图6可以看出:在L3和厚度H恒定的情况下,增长力臂L4与F负相关,起裂力变化率达到42.3%,但L4到达20 mm后,起裂力的变化趋势趋于平缓；当L4=28 mm时,起裂力为1 586.8 N,起裂力变化率仅为3.56%.可见:补偿器对短......
; Abstract: Split Hopkinson Pressure Bar(SHPB) test was simulated to investigate the distribution of the first principal stress and damage zone of specimen subjected to dynamic compressive..., the damage zones run through the specimen in the direction of applied loading and split the specimen into pieces. Key words: Split Hopkinson Pressure Bar(SHPB) test; failure mechanism; dynamic......
: The dynamic compression experiments of TC4-DT Ti alloy were performed at a range of strain rate from 1000 s-1 to 8000 s-1 by high split Hopkinson pressure bar for investigating its dynamic mechanical... of the plastic flow stress. Key words: TC4-DT Ti alloy; dynamic mechanical property; split Hopkinson pressure bar test; Johnson-Cook constitutive model 钛合金以其密度小,比强度高,耐腐蚀与耐热性能优异及低温变形性能好等优点,广泛应用于航空航天,船舶......
