共查询到18条相似文献,搜索用时 156 毫秒
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利用Gleeble-1500热模拟试验机对热成型钢的高温塑性变形抗力进行研究。将试样在变形温度800~1100℃下,分别以0.1、1、10和25 s-1应变速率进行单向拉伸试验,分析变形温度、变形速率和变形程度与变形抗力的关系。结果证明,热成型钢是应变速率和温度的敏感材料,变形抗力随应变速率的增加而增加,变形速率在10s-1时的变形抗力是变形速率为1 s-1的2倍以上;变形抗力随变形温度的升高而降低。通过线性回归分析,建立了热成型钢高温塑性本构数学模型,并把理论计算与试验数据进行对比,证明了该模型具有良好的曲线拟合特性。 相似文献
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采用Gleeble?1500热模拟机,在变形温度为1 100~1 350℃、变形速率为0.01~5 s?1、变形量为60%的实验条件下,对纯钼板坯的高温塑性变形行为进行研究。结果表明:流变应力随变形温度的升高而减小,随应变速率的增大而增大;不同变形温度下流变应力之间的差值随着应变速率的增加逐渐减小;同一应变速率下,峰值应力随变形温度的升高向应变小的方向推移。采用包含Zene-Hollomon参数的双曲正弦模型,建立了纯钼板高温塑性流变应力与变形温度和应变速率之间的本构方程。依据本构方程计算出的纯钼板坯流变应力理论值与实际值的平均相对误差仅为3.68%,表明该本构方程可为纯钼热成形加工工艺的制定提供理论依据。 相似文献
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钼作为一种难熔金属,因其良好的高温强度、抗蠕变性能、导热性能、耐蚀性能和低溅射率等特性,是满足新一代核能技术发展的重要候选材料。离子辐照会改变钼金属的微观结构,使其产生位错环、空洞、气泡等多种缺陷,导致钼的性质发生改变,服役性能大大降低,最终使得钼金属不能长期有效应用于核反应堆中。本文综述了近年来国内外学者基于辐照对钼损伤行为方面的研究,分析了不同离子辐照下钼的微观结构、表面形貌、力学性能及光学特性等方面的影响,并在现有研究基础上对未来离子辐照对钼金属的损伤行为的研究方向进行了展望,以期望对钼金属的研发和核反应堆方面的应用提供参考。 相似文献
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形变对CuZnAl合金在3.5%NaCl溶液中腐蚀性能的影响 总被引:1,自引:0,他引:1
通过对不同状态下的CuZnAl合金在3.5%NaCl溶液中腐蚀速率的测定,分析形变对该合金腐蚀性能的影响。结果表明:形变能降低合金的腐蚀性能,形变后经再结晶退火,能使变形态合金的腐蚀性能有所提高,但仍低于未变形退火态。 相似文献
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钼铼合金具有优良的力学性能和机加工性能,是电子、核工业等领域关键的结构材料。在钼铼合金中加入氧化锆,形成弥散强化作用,并结合形变强化来提高材料的力学性能。研究发现,合金粉粒度随着ZrO2含量的增加而减小,在含量为0.7%时晶粒尺寸最细小均匀;ZrO2颗粒在合金的变形和断裂过程中表现出钉扎效应,显著提升合金的抗拉强度、屈服强度和断后延伸率等力学性能;ZrO2强化钼铼合金的抗拉强度和断后延伸率在ZrO2含量为0.7%时达到最高值,随后减少;ZrO2基本弥散分布在晶界处并与钼基体形成良好结合界面,可以抑制晶界的迁移,提高钼合金的变形抗力。 相似文献
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《稀有金属(英文版)》2017,(10)
The deformation resistance of Fe-Mn-V-N alloy under different deformation conditions was investigated by hot compression method on thermal simulator.Effects of deformation degree, deformation temperature,and strain rate on deformation resistance were analyzed.The results show that when other conditions are constant,the deformation resistance increases with the increase in deformation degree and strain rate and decreases with the increase in deformation temperature. At the same time, the mathematical model of deformation resistance for Fe-MnV-N alloy was established by 1 stOpt software using the Levenberg-Marquardt optimization algorithm carried out on the fitting of regression coefficients, which has higher fitting precision. 相似文献
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Molybdenum is a refractory metal which is recommended for advanced engineering applications requiring high mechanical strength and corrosion resistance at extremely high temperatures. However, Molybdenum-based alloys are generally difficult to machine, due to their superior physical and mechanical properties, usually requiring effective refrigeration. In this work, the feasibility of dry machining of sintered Molybdenum using commercial tools in finish longitudinal turning was investigated. A list of suitable tools was selected and cutting tests were performed in order to evaluate their performance and assess the machinability of sintered Molybdenum. Specifically, chip formation and chip control, surface roughness and cutting forces were considered. It turned out that most of the tools were inadequate for this application, therefore tool life tests were carried out on the remaining tools. Nevertheless, the analysis of experimental data confirmed that good surface quality and satisfactory tool life can be achieved in dry conditions at relatively high cutting speeds by using commercial tools. 相似文献