李旭敏,方峰,蒋建清,周雪峰,候宇鑫.形变影响TC4钛合金组织演变的温度依赖特性研究[J].稀有金属材料与工程,2019,48(10):3379~3386.[Li Xumin,Fang Feng,Jiang Jianqing,Zhou Xuefeng,Hou Yuxin.Temperature-dependent effect of deformation on microstructure and properties of TC4 titanium alloy[J].Rare Metal Materials and Engineering,2019,48(10):3379~3386.]
形变影响TC4钛合金组织演变的温度依赖特性研究
投稿时间:2018-06-14  修订日期:2018-07-20
中文关键词:  TC4钛合金  变形温度  组织演变  相变  性能
基金项目:国家自然科学基金资助(项目号51301038),镇江市重点研发计划资助(项目号GZ2017011)
中文摘要:
      本文采用等应变速率高温拉伸变形试验,研究了TC4钛合金在不同形变温度下微观组织和性能的演变行为,着重探讨了形变对钛合金组织演化、相变的影响作用及其随温度的变化规律。结果表明,α+β两相区变形,随形变温度升高,峰值应力及所需应变降低。形变对微观组织演化的影响作用随形变温度变化而改变:两相区中低温段(900℃以下),形变促进初生α相再结晶,细化初生α相尺寸;两相区高温段(900℃以上),形变促进次生α相球化,其作用随温度升高先增强后减弱。形变影响β→α相变进程,提高次生α相形核率,尤以两相区中低温段变形更为显著,从而使得片层状次生α相数量增加、间距明显细化。随形变温度升高,组织中α相总量先下降后上升,导致硬度先降低后升高,耐蚀性先升高后下降。其中900℃变形时,TC4钛合金α相总量最少(约57%),硬度略有降低而耐蚀性达到最优。
Temperature-dependent effect of deformation on microstructure and properties of TC4 titanium alloy
英文关键词:TC4 titanium alloy  Deformation temperature  Microstructural evolution  Transformation  Properties
英文摘要:
      In this paper, the effect of deformation temperature on the evolution of microstructure and properties of TC4 alloy has been studied by a constant-strain rate tensile test at high temperature. The results show that both the peak stress and required strain of peak stress decrease with increasing temperature in a α+β dual-phase field. The deformed microstructure exhibits a strong temperature-dependent evolution with temperature. Deformation leads to an accelarated recrystallization and refinement of primary α phase at a lower temperature of α+β phase field (below 900 °C), whereas results in a significant spheroidization of secondary α phase at a higher temperature (above 900 °C). Additionally, deformation also affects the nucleation and growth process of β→α transformation, resulting in a larger amount of secondary α phase. With increasing deformation temperature, the volume fraction of α phase firstly decreases and then increases, which shows a good consistence with hardness. However, the corrosion resistance displays a reverse evolution with the amount of α phase. TC4 alloy exhibits a lowest volume fraction of α phase of 57% at a deformation temperature of 900 °C, which corresponds to a lowest hardness and a best corrosion resistance in a NaCl solution.
作者单位E-mail
李旭敏 江苏省先进金属材料高技术研究重点实验室东南大学材料科学与工程学院 xuminli_seu@163.com 
方峰 江苏省先进金属材料高技术研究重点实验室东南大学材料科学与工程学院  
蒋建清 江苏省先进金属材料高技术研究重点实验室东南大学材料科学与工程学院  
周雪峰 江苏省先进金属材料高技术研究重点实验室东南大学材料科学与工程学院 xuefengzhou@seu.edu.cn 
候宇鑫 江苏天工科技股份有限公司  
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