共查询到19条相似文献,搜索用时 109 毫秒
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采用YNS-1000型试验机对轧后余热处理热轧带肋钢筋用恒温加载试验方法进行了高温力学性能研究,分析得出:轧后余热处理热轧带肋钢筋在400℃之前屈服强度、抗拉强度、断后伸长率和断面收缩率变化较小;在200~400℃范围内,有"蓝脆"现象,超过400℃材料高温热强度随温度升高而降低;具有良好的热塑性,断后伸长率和断面收缩率表现出相似的变化规律,800℃后断后伸长率和断面收缩率开始急速下降。 相似文献
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热轧带肋钢筋是工程结构最主要材料之一,主要用于建筑、铁道、桥梁、公路及水电等行业。论述了22mm规格HRB400热轧带肋钢筋的加热、轧制和冷却等工艺,对微氮合金生产的HRB400热轧带肋钢筋屈服强度不合格样品了进行分析,检验了其化学成分及物理性能。结合金相组织以及析出相扫描电镜分析,找出了屈服强度不合格的主要影响因素是终轧温度过高、化学成分控制不精确以及析出物不均匀等原因。 相似文献
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介绍了轧制强锚杆带肋钢筋万向轴离合器的结构,对在轧制强锚杆带肋钢筋过程中快速调试离合器的方法进行了说明。 相似文献
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介绍了冷轧带肋钢筋的生产及应用情况,并根据其供货特点,结合实际论述了工程上使用的矫直剪断设备的情况,并提出了一些使用上应注意的问题. 相似文献
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M.F. Frolish J.C. Walker C. Jiao W.M. Rainforth J.H. Beynon 《Tribology International》2006,38(11-12):1050
As a basis for extended studies into the evolution, structure and corrosion properties of the subsurface layers in hot rolled aluminium alloys, the evolution of the subsurface layers in industrially rolled AA3104 transfer bar has been simulated in a laboratory mill. Test samples taken from the centre of industrially rolled AA3104 transfer bar were highly polished, reheated and homogenised under carefully determined conditions and rolled in the two-high Robertson mill at the University of Sheffield. The stock surfaces and subsurface layers in industrially rolled and laboratory rolled material were then characterised using a combination of optical microscopy, quantification of stock surface morphology, glow discharge optical emission spectrometry (GDOES), focussed ion beam (FIB) microscopy and filiform corrosion testing. The results from the experimental programme have demonstrated that the near-surface metallic element distributions, the microstructures and depths of the subsurface layers and the filiform corrosion susceptibility of the rolled surfaces in the industrially rolled and laboratory rolled materials were all very similar. 相似文献
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高精度矫直辊辊型设计及工艺参数控制是二辊矫直机的核心技术。为了满足高精度棒材矫直要求,在辊型设计过程中依据矫直辊磨损状态、弹塑性理论、塑性变形硬化系数求解模型及中性层偏移理论,提出“凹三凸二”分段辊型的矫直辊组合形式及辊型设计方法。在此基础上,根据棒材与矫直辊的局部线接触状态,建立棒材二辊矫直倾角及辊缝估算模型,进而探讨二辊矫直工艺参数(倾角、辊缝、矫直速度和导板间距)的变化规律和控制策略,并给出具体设计实例和有限元模拟分析。从矫直力、塑性变形深度、直线度及残余应力等角度,证明该辊型设计方法和工艺控制策略的有效性,且现场试验矫后的棒材直线度小于1 mm/m,完全满足棒材高精度矫直标准。 相似文献
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K.H. Jung 《International Journal of Mechanical Sciences》2010,52(9):1136-1144
In this study, a mathematical model has been developed to predict austenite grain size (AGS) of hot rolled steel. Using the compression test, the static (SRX) and metadynamic (MDRX) recrystallization characteristics of medium carbon steel were studied. Compression tests were carried out at various temperatures in the range 900-1100 °C with strain rates ranging from 0.1 to 10 s−1. The time required for 50% recrystallization for the SRX and MDRX was determined by carrying out double compression tests, respectively. Grain growth equation after full recrystallization was also derived by compression tests with various interpass times. The currently determined microstructure model has been integrated with a three-dimensional non-isothermal finite element program. The predicted results based on the model proposed in the present investigation for hot bar rolling processes were compared with the experimental data available in the literature. It was found that the proposed model was beneficial to understand the effect of recrystallization behavior and control the microstructure evolution during the hot bar rolling. 相似文献