曾玉金,万明攀,温鑫,黄朝文,雷旻,赵飞

• 1:贵州大学材料与冶金学院
• 2:贵州省材料结构与强度重点实验室

摘要(Abstract)：

研究了缺口对具有全片层组织的TC21钛合金的拉伸性能的影响,采用扫描电镜(SEM)观察分析了其显微组织和断口形貌特征,计算出了不同退火状态下TC21合金的缺口敏感性系数,并建立TC21钛合金显微组织-缺口拉伸性能的定量关系。结果表明:缺口半径对全片层组织的TC21钛合金的拉伸强度和塑性有显著的影响;随缺口半径的增大,合金拉伸强度逐渐下降,塑性也降低,没有出现"缺口强化"效应;随退火温度增加,全片层组织的TC21钛合金的缺口敏感性减小;缺口对TC21合金的微观断裂机制影响不大,主要为准解理和延性断裂两种混合断裂机制,但随着缺口半径增加,合金断口的宏观特征脆性倾向越明显。

关键词(KeyWords)： TC21钛合金;显微组织;缺口半径;缺口敏感性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51401058);; 贵州省科学技术基金(20171023);; 贵州省科技创新人才团队项目(20175656);; 贵州省科技支撑计划([2017]2313);; 贵州省科技成果转化项目([2019]4106号)

作者(Author): 曾玉金,万明攀,温鑫,黄朝文,雷旻,赵飞

DOI: 10.13289/j.issn.1009-6264.2019-0079

参考文献(References)：

• [1] Boyer R R.An overview on the use of titanium in the aerospace industry[J].Materials Science and Engineering A,1996,213(1/2):103-114.
• [2] Zhao Y L,Li B L,Zhu Z S,et al.The high temperature deformation behavior and microstructure of TC21 titanium alloy[J].Materials Science and Engineering A,2010,527(21/22):5360-5367.
• [3] 虞忠良,赵永庆,周廉,等.缺口对TC21合金高周和低周疲劳的影响[J].稀有金属材料与工程,2007,36(9):1523-1526.YU Zhong-liang,ZHAO Yong-qing,ZHOU Lian,et al.Effect of notch on the high and low cycles fatigue of TC21 alloy[J].Rare Metal Materials and Engineering,2007,36(9):1523-1526.
• [4] Haritos G K,Nicholas T,Lanning D B.Notch size effects in HCF behavior of Ti-6Al-4V[J].International Journal of Fatigue,1999,21(7):643-652.
• [5] Pilchak A L,Szczepanski C J,Shaffer J A,et al.Characterization of microstructure,texture,and micro-texture in near-alpha titanium mill products[J].Metallurgical and Materials Transactions A,2013,44(11):4881-4890.
• [6] Huang R T,Huang W L,Huang R H,et al.Effects of microstructures on the notch tensile fracture feature of heat-treated Ti-6Al-6V-2Sn alloy[J].Materials Science and Engineering A,2014,595(2):297-305.
• [7] 田伟,伏宇,钟燕,等.缺口对TC17钛合金拉伸性能和低周疲劳性能的影响[J].材料热处理学报,2016,37(11):68-72.TIAN Wei,FU Yu,ZHONG Yan,et al.Effects of notches on tensile properties and low cycle fatigue properties of TC17 titanium alloy[J].Transactions of Materials and Heat Treatment,2016,37(11):68-72.
• [8] 虞忠良,赵永庆,周廉.TC21钛合金缺口疲劳试样的应力分布计算[J].稀有金属材料与工程,2007,36(12):2084-2088.YU Zhong-liang,ZHAO Yong-qing,ZHOU Lian,et al.Stress distribution calculation of notched fatigue specimens of TC21 alloy[J].Rare Metal Materials and Engineering,2007,36(12):2084-2088.
• [9] 刘海军,曹睿,何洪,等.K418合金缺口敏感性研究[J].稀有金属,2010,34(5):699-704.LIU Hai-jun,CAO Rui,HE Hong,et al.Notch sensitivity of K418 alloy[J].Chinese Journal of Rare Metal,2010,34(5):699-704.
• [10] 张文泉,王俊英,张学昆.金属材料拉伸试验的缺口效应[J].理化检验:物理分册,2008,44(10):533-535.ZHANG Wen-quan,WANG Jun-ying,ZHANG Xue-kun.Notch effect to fmetallic material during tensiletesting[J].Physicai testing,2008,44(10):533-535.
• [11] 郭萍,赵永庆,曾卫东.TC4-DT钛合金片层组织疲劳裂纹扩展速率[J].稀有金属材料与工程,2016,45(11):2937-2941.GUO Ping,ZHAO Yong-qing,ZENG Wei-dong.Fatigue crack propagation rate of lamellar microstructure for TC4-DT titanium alloy[J].Rare Metal Materials and Engineering,2016,45(11):2937-2941.
• [12] 余永宁.金属学原理[M].冶金工业出版社,2013.
• [13] 钱友荣,田永江,唐林.高强度钢静拉伸的缺口效应[J].北京航空航天大学学报,1985(3):158-165.QIAN You-rong,TIAN Yong-jiang,TANG Lin.The notch sensitivity of high strength steel under tensile loading[J].Journal of Beijing University of Aeronautics and Astronautics,1985(3):158-165.
• [14] 束德林.工程材料力学性能[M].北京:机械工业出版社,2004.
• [15] 石晓辉,曾卫东,孙宇,等.Ti-6Al-4V合金网篮组织与拉伸性能定量关系研究[J].稀有金属材料与工程,2016,45(9):2327-2331.SHI Xiao-hui,ZENG Wei-dong,SUN Yu,et al.Quantitative analysis on microstructure-tensile property relationship for Ti-6Al-4V alloy with basket weave structure[J].Rare Metal Materials and Engineering,2016,45(9):2327-2331.

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