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首页> 外文学位 >Simulation of hot strip rolling by compression testing: Effect of the variation of strain-rate on the constitutive behaviour of a niobium-vanadium microalloyed steel.
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Simulation of hot strip rolling by compression testing: Effect of the variation of strain-rate on the constitutive behaviour of a niobium-vanadium microalloyed steel.

机译：压缩试验模拟带钢热轧：应变速率变化对铌钒钒微合金钢本构行为的影响。

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The major objective of this investigation was to test experimentally the relative validity of simulating hot strip rolling by compression testing at constant true strain rates under axisymmetric conditions.;Isothermal, single- and multi-stage compression tests were carried out on a microprocessor-controlled servohydraulic testing system by using a niobium-vanadium microalloyed steel. Cylindrical specimens were subjected to deformation at rates of strain either constant or varying as during a rolling pass/passes. True stress-true strain flow curves were obtained by correcting the measured stress-strain data for the effect of friction at the specimen/die interface. The constant friction shear factor was determined quantitatively by hot ring tests. Optical microscopy was used to observe the prior austenite microstructures.;Based on the results of single-stage, constant true strain-rate tests, the dependence of the flow strength as a function of strain, rate of strain and temperature was modelled by using an Arrhenius-type equation.;The comparison of the responses of the material to the two types of compression revealed no significant differences between flow curves except at the very end of the tests. This observation agreed with the predictions of the model, which was developed based on the constant strain-rate flow curves, indicating that the material follows a mechanical equation of state in hot rolling processes.;For the purpose of the simulation, the material's flow through the roll gap was theoretically modelled.;The flow curves and the average flow strengths were compared between the constant and varying strain-rate, four-stage tests. Differences were also found negligible. The variation of the average flow strength during multistage testing was dependent of the length of the interpass time and the average strain rate in a significant manner.;It was found that the microstructures developed from single- as well as multi-stage compression tests were independent of the variation of the strain rate during deformation.;This study showed that the constant true strain-rate compression testing is a very useful technique in simulating hot flat strip rolling processes.
机译：这项研究的主要目的是通过在轴对称条件下以恒定的真实应变率通过压缩试验来模拟模拟热轧带钢的相对有效性。；在微处理器控制的伺服液压系统上进行了等温，单级和多级压缩试验铌钒微合金化钢测试系统。圆柱试样在一个或多个轧制道次中以恒定或变化的应变速率变形。通过校正测得的应力-应变数据以获取试样/模具界面处的摩擦效果，可以获得真实的应力-真实应变流曲线。通过热环试验定量测定了恒定的摩擦剪切系数。使用光学显微镜观察先前的奥氏体组织。;基于单阶段，恒定的真实应变率测试的结果，通过使用有限元模型模拟了流动强度与应变，应变率和温度的关系。 Arrhenius型方程。;材料对两种压缩类型的响应的比较表明，除了试验刚结束时，流动曲线之间没有显着差异。该观察结果与基于恒定应变率流动曲线开发的模型预测相吻合，表明该材料在热轧过程中遵循机械状态方程。对辊缝进行了理论建模。;比较了恒定应变率和变化应变率的四阶段试验的流动曲线和平均流动强度。还发现差异可以忽略不计。多阶段试验中平均流动强度的变化在很大程度上取决于通过时间的长短和平均应变率。；发现单阶段和多阶段压缩试验产生的微观结构是独立的研究表明，恒定的真实应变率压缩试验是模拟扁平带钢热轧过程的一项非常有用的技术。

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  • 作者

    Wang, Fengyin.;

  • 作者单位

    University of New Brunswick (Canada).;

  • 授予单位 University of New Brunswick (Canada).;
  • 学科 Engineering Mechanical.;Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 1989
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  • 原文格式 PDF
  • 正文语种 eng
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