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冷却方式对低铬白口铸铁热变形后的组织与性能的影响 总被引:3,自引:0,他引:3
对低铬白口铸铁经过40%热变形后,用不同冷却方式下得到的组织与力学性能进行了研究。结果表明:变莆后的冷却方式能显著影响低铬白口铸铁的组织与力学性能,其中风冷的综合力学性能最好。 相似文献
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研究了低铬耐磨铸铁经40%热变形及不同方式冷却后的组织与耐磨性的关系。结果表明:该铸铁经热变形后的组织与耐磨性有良好的对应关系,其耐磨性随硬度的增加而增大,同时也与组织中碳化物的形状、大小及分布有关。 相似文献
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对经不同热变形量的低铬白口铸铁的组织与性能进行了观察、测试及分析,结果表明:40%-50%热变形量的低铬白口铸铁力学性能最好。 相似文献
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通过冲击磨损试验,测试了变形低铬半钢耐磨性,并对其磨损面特征进行了分析。结果表明:该钢变形后经适当的余热热处理可获得较高的耐磨性能。 相似文献
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研究了低铬耐磨铸铁经40%热变形及不同方式冷却后的组织与耐磨性的关系。结果表明:该铸铁经热变形后的组织与耐磨性有良好的对应关系,其耐磨性随硬度的增加而增大,同时也与组织中碳化物的形状、大小及分布有关。 相似文献
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热轧TRIP钢具有优异的力学性能,热轧生产后经过酸洗处理可以直接用于汽车制造。采用Gleeble3500型热模拟试验机研究了C-Si-Mn-Nb系热轧TRIP钢形变奥氏体在不同连续冷却条件下的组织变化情况,绘制了动态CCT曲线。通过研究不同冷速下试样组织发现,冷却速率越大,组织中未转变奥氏体含量越低。最后,依据对动态CCT曲线的分析在Gleeble3500型热模拟试验机上模拟热轧了TRIP钢。结果表明:实验钢轧后以15℃/s的低冷却速率冷却至贝氏体区等温后,残留奥氏体的含量和稳定性更高,TRIP钢力学性能优异,抗拉强度和伸长率分别达到952 MPa和30%,强塑积高达28560 MPa·%。 相似文献
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采用Gleeble1500热模拟机测定低碳铌钢的奥氏体连续冷却转变曲线,对钢板热变形后的冷却过程进行了非稳态导热分析,并据此预测钢板以不同方式冷却后的组织。上海五钢集团现场热轧控冷试验表明,预测结果与实验结果吻合得很好,实物台架实验表明,细小多边形铁素体组织的钢板具有更高的疲劳性能。 相似文献
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高碳非调质钢连续冷却时的珠光体型相变及力学性能 总被引:5,自引:1,他引:4
对3种不同含碳量(0.64%、0.70%、0.76%)的高碳非调质钢在连续冷却条件下,过冷奥氏体发生珠江体型相变的规律及力学性能进行了试验研究。得出了为了保证工件稳定、可靠地获得要求的珠江体型转变产物和力学性能,必须使冷却速度控制在1.0℃/s≤V8/5≤10℃/s范围。本文对影响珠光体产物力学性能的因素及工件控制冷却的原理进行了讨论。 相似文献
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In order to establish the rolling process parameters of grade-2 commercially pure titanium(CP-Ti),it is necessary to understand the transformation mechanism and mechanical properties of this material.The β→α transformation kinetics of the grade-2 CP-Ti during continuous cooling was measured and its hot compression behavior was investigated using Gleeble-1500 thermal mechanical simulator.Dynamic CCT diagram confirms that cooling rate has an obvious effect on the start and finishing transformation and microstructures at room temperature.The critical cooling rate for β-phase transforms to α phase is about 15 °C/s.When the cooling rate is higher than 15 °C/s,some β phases with fine granular shape remain residually into plate-like structure.The plate-like α phase forms at cooling rate lower than 2 °C/s,serrate α phase forms at medium cooling rates,about 5-15 °C/s.The flow stress behavior of grade-2 CP-Ti was investigated in a temperature range of 700-900 °C and strain rate of 3.6-40 mm/min.The results show that dynamic recrystallization,dynamic recovery and work-hardening obviously occur during hot deformation.Constitutive equation of grade-2 CP-Ti was established by analyzing the relationship of the deformation temperature,strain rate,deformation degree and deformation resistance. 相似文献
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Ligang Liu Qiang Li Bo Liao Yukui Gao Yuhui Wang Xuejun Ren Qingxiang Yang 《Journal of Materials Engineering and Performance》2010,19(7):921-927
It is important but difficult to study the constitutive equations describing the mechanical properties of steels. In this
work, a thermal/mechanical simulator was used in conjunction with the Anand model to obtain the stress-strain curves for a
high chromium steel associated with different temperature/strain rate pairs. The finite element software, ANSYS, was used
to simulate the stress-strain behavior of a high chromium steel during casting at the strain rates of 1, 0.1, and 0.01 1/s,
and to validate the Anand model. The results show that the high-temperature deformation is mainly plastic and the von Mises
stresses are small, the stresses introduced at elevated temperatures have little effect on the residual stress fields, and
the simulation of the mechanical behavior of steels using an elastic-plastic model at low temperatures during cooling is acceptable. 相似文献
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研究了TA15钛合金β区热变形时,变形温度、变形量、变形速率、冷却方式等工艺参量对片状组织特征参数β晶粒尺寸D、α集束尺寸d、α片厚b的影响,以及片状组织特征参数与力学性能的关系.利用多元回归分析得到了强度、塑性与3个特征参数D、d、b的定量关系式,通过这种定量关系可以预测力学性能. 相似文献