不同组织Ti6321钛合金在低温高应变速率下的变形和断裂行为

李严星;王琳;闫志维;安瑞;周哲;宁子轩;程焕武;程兴旺

兵工学报 ›› 2022, Vol. 43 ›› Issue (12) : 3221-3227.

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  • 主管：中国科学技术协会

    主编：许毅达

    ISSN 1000-1093

    　

  • 主办：中国兵工学会

    出版：《兵工学报》 编辑部

    CN 11-2176/TJ

《兵工学报》是我国国防科技领域最具影响力的学术期刊之一，创刊于1979年，目前被国内所有重要数据库收录，其综合评价指标近年来一直名列兵工技术类科技期刊的首位；《兵工学报》目前还被国际上著名的检索机构美国......
兵工学报 ›› 2022, Vol. 43 ›› Issue (12) : 3221-3227. DOI: 10.12382/bgxb.2021.0720
论文

不同组织Ti6321钛合金在低温高应变速率下的变形和断裂行为

  • 李严星1， 王琳1，2，3， 闫志维1， 安瑞1， 周哲1， 宁子轩1， 程焕武1，2， 程兴旺1，2
作者信息 +

Deformation and Fracture Behaviors of Ti6321 Titanium Alloy with Different Microstructures at Low Temperature and HighStrain Rate Conditions

  • LI Yanxing1, WANG Lin1,2,3, YAN Zhiwei1, AN Rui1, ZHOU Zhe1, NING Zixuan1, CHENG Huanwu1,2, CHENG Xingwang1,2
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文章历史 +

摘要

针对目前关于船用钛合金在低温和高应变率速率下的研究不足的问题，通过热处理获得3种组织的Ti6321钛合金，研究不同组织在温度-80~25 ℃、应变速率2 500 s-1及3 500 s-1左右的变形和断裂行为。采用低温分离式霍普金森压杆实验装置进行加载，通过光学显微镜和扫描电子显微镜等表征方法，对其微观组织演化进行观察分析。研究结果表明：随着温度的降低，Ti6321钛合金强度增加，塑性减小；在室温下，双态组织具有较好的强塑性匹配；随着温度的降低，等轴组织具有较高的强度和较好的低温塑性变形能力，表现出良好的低温动态压缩性能。断裂机制研究表明等轴组织和双态组织表现出典型的韧性断裂特征；魏氏组织断口出现高低不平的解理面，表现出明显的脆性断裂倾向。

Abstract

To close the research gap on marine titanium alloys at low temperatures and high strain rate rates, Ti6321 titanium alloys with three structures are prepared through heat treatment. The deformation and fracture behaviors of the three alloy samples within the temperature range of -80-25 ℃ and strain rate range of 2 500-3 500 s-1 are studied. A low-temperature split Hopkinson pressure bar is used for loading. The evolution of the microstructure is observed and analyzed by an optical microscope and scanning electron microscope. The results show that the strength of Ti6321 titanium alloy increases and the plasticity decreases as the temperature declines. The bimodal structure has good strength and plasticity matching at room temperature. With the decrease of temperature, the equiaxed structure has higher strength and better low-temperature plastic deformation capability, and shows good low-temperature dynamic compression properties. The study of the alloy's fracture mechanism shows that the equiaxed and bimodal structures exhibit typical ductile fracture characteristics. The fracture of Widmanstatten structure is an uneven cleavage surface, which has an evident tendency to brittle fracture.

关键词

Ti6321钛合金 / 低温 / 高应变速率 / 微观组织 / 断裂行为

Key words

Ti6321titaniumalloy / lowtemperature / highstrainrate / microstructure / fracturebehavior

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李严星， 王琳， 闫志维， 安瑞， 周哲， 宁子轩， 程焕武， 程兴旺. 不同组织Ti6321钛合金在低温高应变速率下的变形和断裂行为. 兵工学报. 2022, 43(12): 3221-3227 https://doi.org/10.12382/bgxb.2021.0720
LI Yanxing, WANG Lin, YAN Zhiwei, AN Rui, ZHOU Zhe, NING Zixuan, CHENG Huanwu, CHENG Xingwang. Deformation and Fracture Behaviors of Ti6321 Titanium Alloy with Different Microstructures at Low Temperature and HighStrain Rate Conditions. Acta Armamentarii. 2022, 43(12): 3221-3227 https://doi.org/10.12382/bgxb.2021.0720

基金

爆炸科学与技术国家重点实验室基金项目(YBKT-17-06)

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