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国家重点基础研究发展计划(2005CCA06400)

作品数:6 被引量:8H指数:2
相关作者:赵永庆魏建锋陈永楠郭萍郑晶更多>>
相关机构:西北有色金属研究院西安交通大学长安大学更多>>
发文基金:国家重点基础研究发展计划更多>>
相关领域:金属学及工艺一般工业技术更多>>

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Effect of deformation processing parameter on microscopic structure of Ti14 alloy under semi-solid被引量:1
2007年
Hot compressive deformation test of Ti-Al-Cu-Si alloy was performed on Gleeble-3500 hot-Simulator over the range of deformation temperature from 1 000 to 1 300 ℃,strain rate from 0.005 s-1 to 5 s-1,deformation degree from 40% to 70%,and samples of d 8 mm×15 mm were used. Change rules of microstructure were mainly studied. The results show that deformation temperature directly influences the nucleation growth and globurizing of grain,and with the temperature rising,the diameter of grain increases,the grain boundary widens. The effect of deformation degree on microstructure varies with deformation temperature. Equivalent diameter of grains shows a trend of falling before elevation with strain rate increasing and temperature rising.
郭萍赵永庆吴玮璐
关键词:微观结构
Microstructure evolution and grain growth behavior of Ti14 alloy during semi-solid isothermal process被引量:6
2011年
Microstructure evolution of Ti14 (α+Ti2Cu) alloy during semi-solid isothermal process at different temperatures was investigated. The results reveal that both the temperature and holding time have effect on the grain growth behavior. The grains grow obviously and the degree of globularity increases with the increase of holding time. According to the statistic analysis of experimental data, the grain growth indices are 0.88 and 0.97 at 1 000 ℃ and 1 050 ℃, respectively, which indicates that increasing isothermal temperature would accelerate microstructural evolution.
陈永楠魏建锋赵永庆郑晶
关键词:SEMI-SOLID
Ti14合金半固态微观组织演变特征(英文)
2012年
采用热模拟系统研究半固态变形参数对合金微观组织演变和元素分布的影响,并讨论变形过程中的Ti2Cu析出行为。结果表明:微观组织,特别是Ti2Cu析出过程受变形参数影响较大;温度的增加,应变速率和变形量的降低将促进Ti2Cu在晶界的偏析,最终形成了网状晶界结构。分析认为:半固态晶界的析出过程主要受控于包晶反应,升温或降低其他变形参数将有利于液相在晶界的析出,形成晶界Cu元素富集区。液相的偏析和Cu元素的富集增加了该区域的包晶反应,最终在冷却过程中形成了粗大的网状晶界结构。
陈永楠魏建锋赵永庆马雪丹郝建民
关键词:钛合金半固态微观组织演变
变形工艺参数对半固态Ti14合金显微组织的影响被引量:2
2008年
采用φ8mm×15mm的试样在Gleeble-3500热模拟实验机上进行半固态Ti14合金的高温压缩变形实验,研究不同变形温度(1000—1200℃)、不同变形量(40%-70%)和不同应变速率(0.005—5/s)对显微组织的影响,分析了晶界的变化规律。结果表明:变形温度直接影响晶粒的形核长大及球化,随着温度升高,晶粒直径明显增大,晶界宽化;变形程度对微观组织的影响随变形温度的不同而不同;晶粒等效直径随着应变速率增大和温度的升高呈现出先降后升的趋势。
郭萍赵永庆吴玮璐
关键词:半固态变形显微组织
Tensile properties and microstructure of Ti14 alloy after semi-solid forging被引量:1
2011年
Tensile properties of a new α+Ti2Cu alloy after solid forging at 950 °C and semi-solid forging at 1 000 °C and 1 050 °C were investigated over the temperature range of 20-600 °C. The results reveal that high strength and low ductility are obtained in all semi-solid forged alloys. Tensile properties decrease as the semi-solid forging temperature increases, and cleavage fractures are observed after semi-solid forging at 1 050 °C. The variations in tensile properties are attributed to the coarse microstructures obtained in the semi-solid alloys. It is found that the elevated semi-solid temperatures lead to more liquid precipitates along the prior grain boundaries, which increases the peritectic precipitation and formation of Ti2Cu precipitation zones during re-solidification. Recrystallization heat treatment leads to fine microstructure of semi-solid forged alloys, resulting in improvement of tensile properties.
陈永楠魏建锋赵永庆张学敏
关键词:MICROSTRUCTURE
一种典型钛合金Ti-Al-Cu-Si的半固态变形
2007年
采用Gleeble-3500热模拟实验机对Ti-Al-Cu-Si钛合金在温度为1000 ̄1200℃之间,应变速率为0.005 ̄5/s之间,变形程度为40% ̄70%的条件下进行了高温热压缩实验研究。分析了实验合金高温变形时流变应力与应变速率、变形温度及变形程度之间的关系以及组织变化,为优化变形加工条件提供依据。实验结果表明:在恒应变速率的条件下,合金的真应力水平随着温度的升高而降低,合金的稳态流变应力随应变速率的增大而减小,随变形程度的增大真应力减小。
郭萍赵永庆
关键词:半固态变形
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