期刊文献+

双峰结构纯钛的低周疲劳性能研究:试验和模拟

Study on Low-cycle Fatigue Performance of Pure Titanium with Bimodal Structure:Experiment and Simulation
原文传递
导出
摘要 通过低温轧制和退火热处理在纯钛的微观组织中引入了双峰晶粒分布,对双峰结构纯钛(BM-Ti)的拉伸性能和低周疲劳性能进行了系统地研究,结果表明,相比于原始粗晶纯钛(CG-Ti)和超细晶纯钛(UFG-Ti),双峰结构纯钛表现出高屈服强度(634.4 MPa)和高均匀伸长率(7.2%)的优异强韧匹配性能。然而,双峰结构并不能有效提高纯钛的低周疲劳寿命。循环过程中,双峰结构纯钛的粗晶粒区域承担了大部分的塑性变形,大量位错在粗晶粒内部进行堆积,并逐渐分割晶粒导致粗晶粒细化。通过晶体塑性有限元法模拟了双峰结构纯钛的低周疲劳行为,引入了累积塑性应变以评估疲劳过程中的损伤,发现双峰结构纯钛的异质界面处由于应变不相容性更容易导致疲劳裂纹的萌生。 The bimodal-grained distribution was introduced into the microstructure of pure titanium through cryo-rolling combined with annealing heat treatment.The tensile properties and low-cycle fatigue properties of bimodal pure titanium(BM-Ti)were systematically studied.Compared to the original coarse-grained pure titanium(CG-Ti)and ultra-fine grained pure titanium(UFG-Ti),BM-Ti exhibited excellent strength-ductility matching properties with high yield strength(634.4 MPa)and high uniform elongation(7.2%).The results of low-cycle fatigue experiments indicate that the bimodal structure cannot effectively improve the fatigue life of pure titanium.During the cycling process,the coarse-grained area of BM-Ti bore most of the plastic deformation,and a large number of dislocations accumulated within coarse grains,gradually dividing the grains and leading to the refinement of coarse grains.The low-cycle fatigue behavior of BM-Ti was simulated by crystal plasticity finite element method,and accumulated plastic strain was introduced to evaluate the damage during the fatigue process.It was found that the heterogeneous interface of BM-Ti is more prone to fatigue crack initiation due to strain incompatibility.
作者 唐沛 张勇 贾云飞 李晓 汪永纪 TANG Pei;ZHANG Yong;JIA Yunfei;LI Xiao;WANG Yongji(Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237;School of Engineering,Huzhou University,Huzhou 313000)
出处 《机械工程学报》 EI CAS CSCD 北大核心 2024年第12期228-239,共12页 Journal of Mechanical Engineering
基金 国家自然科学基金(52222505,51975211) 上海市自然科学基金(23ZR1415500)资助项目。
关键词 双峰结构 强度-韧性权衡 低周疲劳 裂纹萌生 bimodal structure strength-ductility trade-off low-cycle fatigue fatigue crack initiation
  • 相关文献

参考文献3

二级参考文献7

共引文献66

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部