王点,李仲洋,彭武贤,陈逸晖,刘国怀,王昭东.累积叠轧TC4合金制备超细晶组织的研究[J].稀有金属材料与工程,2018,47(10):3104~3111.[wangdian,lizhongyang,pengwuxian,chenyihui,liuguohuai,wangzhaodong.Study on Ultra-Fine Grains Processing for TC4 Titanium Alloy by Accumulative Roll Bonding[J].Rare Metal Materials and Engineering,2018,47(10):3104~3111.]
累积叠轧TC4合金制备超细晶组织的研究
投稿时间:2017-01-17  修订日期:2018-09-27
中文关键词:  TC4合金  累积叠轧  超细晶  界面结合
基金项目:十三五国家重点研发计划(2016YFB0301201和2016YFB0300603),国家自然科学项目51504060,辽宁省科学技术计划项目博士启动基金201501150
中文摘要:
      通过累积叠轧技术进行TC4合金超细晶组织的制备,考察了TC4合金的热变形特点以及叠轧工艺窗口,研究了叠轧工艺参数和热处理制度对叠轧板材界面结合和微观组织的影响。结果表明:TC4合金的应力-应变曲线表现为动态回复特征,热模拟条件下在加热温度(≥700℃)和变形速率(≤0.1s-1)下能够实现强烈塑性变形。最终TC4合金进行叠轧界面的防氧化处理后,并在加热温度为720℃、轧制速度小于0.5m/s时,获得良好的界面结合和板材质量。累积叠轧变形过程是α/β协同变形和剪切变形综合作用的结果,组织中存在拉长的条带组织以及大量的剪切带。随着叠轧层数的增加,条带组织的间距逐渐变小同时剪切带组织逐渐增加,在叠轧16层(变形量为92.3%)后条带间距为200nm~500nm之间。热处理过程中随着加热温度的增加,溶质扩散和再结晶过程促进了界面结合并最终与基体保持一致,同时叠轧16层的TC4板材在加热温度700℃、保温时间60min的热处理过程中能够实现完全再结晶,获得晶粒尺寸为300nm~600nm的超细晶组织。
Study on Ultra-Fine Grains Processing for TC4 Titanium Alloy by Accumulative Roll Bonding
英文关键词:TC4 alloys  accumulative rolling bonding  ultra-fine grain  interfacial bonding
英文摘要:
      The effect of processing parameters on deformation behavior and microstructures of TC4 titanium alloy were investigated by using simulated compression tests. Select the best hot-work parameters and ultra-fine grained TC4 sheets with high strength were manufactured by accumulative roll-bonding in this work. The results showed that the flow stress of TC4 alloys increased quickly to a peak and then decreased to a steady value with strain increasing. The steady and peak stress obviously decreased as deformation temperatures increased and strain rates decreased. The accumulative rolling were finally conducted at about 700℃ with rolling speed less than 0.5m/s to prepare sheets without cracking and interface oxidizing. As the accumulative layers increased to 16, the grain sizes were refined to 500nm and high-quality interfaces were obtained. The ultra-fine grain structure of TC4 alloy was fabricated by accumulative rolling bonding process, during which the hot deformation process and the ARB processed window were studied, and the effect of the ARB parameters and the heat treatment process on the interface bonding and the microstructure was investigated. The stress-strain curve takes on the dynamic recovery process, and the high temperature (≥700℃) and deformation rates (≤0.1s-1) can promote the fine grains and the sheet quality. Finally the excellent interface bonding and the sheet quality can be obtained at the temperature of 720℃ and the low rolling rate (≤0.5m/s) with the anti-oxidation treatment of the contact interface. The deformation during ARB process is composed with the cooperation deformation of α/β grains and the shear deformation, and the elongated band structure and the shear bands are observed in the ARB processed TC4 alloy. The band structure spacing decrease gradually with the increase of the ARB layers, and the bands spacing of 200nm~500nm can be obtained after the 16 layers ARB process. Simultinately the increasing heating temperature during the heat treatment can promote the solutes diffusion and the recrystallization process, which can be consisted with the matrix structure. Finally the ultra-fine grain with 300nm~600nm can be obtained with the heating temperature of 700℃ and the holding time of 60min for the ARB processed TC4 alloy.
作者单位E-mail
王点 轧制技术及连轧自动化国家重点实验室 915344780@qq.com 
李仲洋 轧制技术及连轧自动化国家重点实验室  
彭武贤 轧制技术及连轧自动化国家重点实验室  
陈逸晖 轧制技术及连轧自动化国家重点实验室  
刘国怀 轧制技术及连轧自动化国家重点实验室 liugh@ral.neu.edu.cn 
王昭东 轧制技术及连轧自动化国家重点实验室  
摘要点击次数: 21
全文下载次数: 20
查看全文  查看/发表评论  下载PDF阅读器
关闭