摘要
为探究提升钛合金力学性能的新途径,开发了脉冲电流处理装置,其可在数秒内使试样温度达到900℃,该技术具有速度快、节能的优势,并开展了不同占空比下脉冲电流处理对TC4钛合金力学性能和微观组织快速改性的研究。与常规固溶处理相比,经不同占空比脉冲电流处理后的试样强度均有不同程度的提升,屈服强度和抗拉强度的最大增幅分别为20.87%和10.86%。采用扫描电子显微镜(SEM)和电子背散射衍射(EBSD)等表征手段发现,脉冲电流的热效应和非热效应相互协同作用促进了TC4钛合金中位错的移动,引发元素扩散、相变以及晶粒尺寸变化。研究结果与分析表明,适当的电脉冲参数能够通过相变和快速晶粒细化,达到改善TC4钛合金的力学性能的目的。
To explore new approaches to enhance the mechanical properties of titanium alloy,a pulsed current treatment device was developed,which can raise the temperature of the specimen to 900℃within a few seconds.This technology has the advantages of high speed and energy conservation.A study was carried out on the rapid modification of the mechanical properties and microstructure of TC4 titanium alloy through pulsed current treatment with different duty cycles.Compared with conventional solid solution treatment,the strength of specimens treated by pulsed current with different duty cycles is improved to varying degrees.The maximum increase amplitude in yield strength and tensile strength are 20.87%and 10.86%,respectively.Characterization methods such as scanning electron microscopy(SEM)and electron backscatter diffraction(EBSD)reveale that the synergistic effect of the thermal and non-thermal effects of pulsed current promotes the movement of dislocations in TC4 titanium alloy,triggering elemental diffusion,phase transformation and changes of grain size.The research results and analysis indicate that appropriate electrical pulse parameters can improve the mechanical properties of TC4 titanium alloy through phase transformation and rapid grain refinement.
作者
彭文飞
康健
邵熠羽
郑雪梅
PENG Wen-fei;KANG Jian;SHAO Yi-yu;ZHENG Xue-mei(Faculty of Mechanical Engineering and Intelligent Manufacturing,Ningbo University,Ningbo 315211,China;Ministry of Education Key Laboratory of Impact and Safety Engineering,Ningbo University,Ningbo 315211,China)
出处
《塑性工程学报》
北大核心
2026年第3期77-86,共10页
Journal of Plasticity Engineering
基金
浙江省自然科学基金资助项目(LMS25E050015)
鄞州区企业“卡脖子”技术研发(HX2024000842)
宁波市科技创新2025重大专项(2021Z099)。
关键词
脉冲电流
钛合金
占空比
力学性能
微观组织
pulsed current
titanium alloy
duty cycle
mechanical properties
microstructure
