雾化喷射角度对热轧钢板冷却影响的模拟分析

利用有限元耦合场数值模拟计算方法对热轧钢板雾化冷却进行模拟,在固定喷嘴到热轧钢板距离H的情况下,得出喷嘴喷射角度对热轧钢板雾化冷却的影响,并对在有重力作用下的雾化冷却影响进行了分析研究.     

雾化冲击射流冷却热轧钢板的研究

利用有限元耦合场数值模拟计算方法对热轧钢板雾化冲击射流冷却进行模拟计算,结果表明,在其它条件相同的情况下,单喷嘴喷射时,在上喷和下喷的喷嘴附近冷却能力相同;多喷嘴喷射时,横向存在二次冷却,钢板表面横向温度分布总体上呈现逐渐降低的趋势。     

两相雾化除尘参数对热轧机组除尘效率的影响

为了提高热轧机组除尘效率,降低热轧现场粉尘污染,研究了两相雾化除尘技术的气压、液压对雾场参数的影响.首先,在理论分析的基础上进行雾场的数值模拟;其次,搭建试验平台进行喷雾试验,验证了所建模型的准确性.分析了不同气、液两相的压力组合对雾场参数的影响,着重分析了对雾滴粒径的影响.结果 表明,随着气相压力和液相压力的增大,喷...     

喷雾冷却中射流出口高度和高温钢板表面温度对换热系数的影响

利用有限元耦合场数值模拟计算方法进行了高温钢板纯水喷雾冷却的模拟,研究了射流出口高度和钢板表面温度对换热系数的影响.模拟结果表明:在其他参数不变的情况下,随喷射距离(在200~500mm范围内)的减小,换热系数总体呈增加趋势;随钢板表面温度(在1050~200K范围内)的增加,换热系数总体呈减小趋势.     

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In order to solve the problems of time-consuming and intense vibration during the calculation process of inverse heat conducting problem (IHCP) with conjugate gradient method (CGM), a non-iterative model was developed based on finite element method (FEM) and related program code was compiled with Fortran. This non-iterative method was then applied to IHCP of laminar cooling process of hot rolled steel plate to calculate the convective heat transfer coefficient in the boundary. Through comparison of the convective heat transfer coefficient obtained by both CGM and the non-iterative method, the results were shown to be consistent with each method. Furthermore, the computing result of the non-iterative method were more stable, and had an obviously faster speed, which eventually cut down the whole computing by 76%. The new method could retain high sparsity of the matrix, which is more concise than the exiting non-iterative method. Besides, the new non-iterative method could also be an efficient way to calculate the heat flux and wall temperature at the same time, which made it possible for real-time output of boundary conditions during laminar cooling process of hot rolled steel plate.     

09CuPCrNi-A热轧钢板剪切后开裂原因分析

通过扫描电镜、能谱分析、金相检验等手段,分析了造成09CuPCrNi-A钢板剪切后横断面上出现中心开裂及钢板冲击韧性波动的原因。确认钢板剪切后中心开裂是由P及S偏析所致,这也是导致钢板冲击韧性波动的原因。     

08AlPL热轧板的研制

介绍了０８ＡｌＰＬ热轧板轧制的工艺与性能，试验证明，０８ＡｌＰＬ热轧板是抗拉强度≥３９０ＭＰａ的，具有优良成形性的汽车用钢，在２３３Ｋ（－４０℃）条件下应用，不会因含磷而引起脆断，而且耐疲劳性能良好。     

Effect of Controlled Cooling After Hot Rolling on Mechanical Properties of Hot Rolled TRIP Steel

A three-step cooling pattern on the runout table（ROT）was conducted for the hot rolled TRIP steel.Microstructural evolution during thermomechanical controlled processing（TMCP）was investigated.Processing condition of controlled cooling on a ROT in the laboratory rolling mill was discussed.The results indicated that the microstructure containing polygonal ferrite,granular bainite and a significant amount of the stable retained austenite can be obtained through three-step cooling on the ROT after hot rolling.TMCP led to ferrite grain refinement.Controlled cooling after hot rolling resulted in the stability of the remaining austenite and a satisfactory TRIP effect.Excellent mechanical properties were obtained through TMCP for the hot rolled TRIP steel.     

热轧带钢层流冷却温度控制模型的应用分析

 工业大学金属材料与加工重点实验室, 安徽 马鞍山 243002) 摘要：在带钢热轧后的冷却过程中，热轧带钢卷取温度的数学模型是至关重要的。介绍了某热轧带钢厂的卷取温度控制数学模型，针对传统的热轧带钢层流冷却卷曲温度控制中数学模型的固有缺陷，分别采用了差分方程和有限元数值模拟的方法，建立带钢厚度方向上的温度场。对测得的数据进行了分析，结果表明：在考虑带钢与介质的热交换的同时再考虑带钢内部的热传导大大提高模型的预报精度，为定量地描述计算值与实测值之间的偏差提供了依据。     

Ti在热轧钢板中沉淀强化行为的试验研究

研究了低C-低Mn—Ti钢中Ti的沉淀相在加热过程中的变化规律。在传统的加热温度区间内,Ti在奥氏体中的最大固溶度约为0．14％,而TiN、Ti2S回溶量很小。在580℃卷取时,Ti的析出相尺度在5nm以下,有很好的强化作用,Ti的析出相尺度及形态变化,对强化作用有较大影响。     

Constraint Cooling of Hot Rolled Coil

The layer thermal conductivity during constraint cooling of hot rolled coil was dcscribed by using equivalent thermal conductivity model and finite element method. Two radial stress concentration zones in constraint cooled coil were shown by numerical analysis, and the tension stress was assumed to be the main factor to induce stress corrosion. The experimental results show that the longer the water cooling time is, the smaller the grain size and the more uniform the grains are.     

热轧钢卷冷却过程温度演变的模拟和分析

 采用有限元方法对热轧钢卷冷却中的温度场进行解析,求解过程中考虑了钢卷径向各层之间接触对传热的影响以及卷心热辐射的自持作用,得到了钢卷不同部位的温度分布和在50 h冷却过程的温降曲线。在钢卷表面取代表点,现场实测了冷却50 h后的钢卷温度变化过程,并与有限元计算值进行了对比,表明计算值与实测值吻合较好。同时模拟研究了钢卷强制冷却条件下的温度演变,指出钢卷强制冷却可以大大加快成品库的周转。