Study on Tensile Stress Corrosion Behavior of Titanium Alloy at Slow Strain Rate
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摘要: 对TA31和TC4ELI两合金分别在干燥空气、3.5% NaCl环境下进行慢应变速率拉伸试验。结合应力-应变曲线以及断口宏观、微观组织分析两种材料的应力腐蚀敏感性。结果表明:在35℃、3.5%(w,下同) NaCl溶液、应变速率为10-6/s条件下,TC4ELI合金应力腐蚀敏感性较高,在5×10-7/s和5×10-6/s的应变速率下应力腐蚀敏感性较低;TA31合金在上述3种应变速率下应力腐蚀敏感性均较低;在3.5% NaCl环境中,TA31合金断口形貌较空气中试验的断口形貌无明显的变化,TC4ELI则出现较明显的解理面。Abstract: The tensile stress corrosion tests of TA31 and TC4ELI alloys at slow strain rates are carried out in dry air and 3.5% NaCl solution, respectively. Combined with the stress-strain curve, the macro and micro structures of the fractured surfaces, the stress corrosion sensitivity of the two alloys are analyzed. The results show that TC4ELI alloy has high stress corrosion sensitivity in 3.5% (w)NaCl solution at 35℃ and the strain rate of 10-6/s, when the strain rates are 5×10-7/s and 5×10-6/s, the stress corrosion sensitivity is low. TA31 alloy has low stress corrosion sensitivity at the above three strain rates. In 3.5% NaCl solution environment, the fracture morphology of TA31 alloy has no obvious change compared with that of air test, while TC4ELI has obvious cleavage surface.
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Keywords:
- TA31 alloy /
- TC4ELI alloy /
- slow drawing /
- strain rate
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[1] 赵永庆,马朝利,常辉,等.1200MPa级新型高强韧钛合金[J].中国材料进展, 2016, 35(12):914-918. [2] 杨胜利,孙二举,刘向前,等.热处理工艺对不同组织类型的Ti6321合金板坯组织与性能的影响[J].稀有金属材料与工程, 2020, 49(3):1002-1008. [3] 杨胜利,宋德军,高福洋,等.板坯组织类型及热处理对Ti6321合金板材力学性能各向异性的影响[J].中国有色金属学报, 2020, 30(6):1358-1367. [4] FU B G, WANG H W, ZOU C M, et al.The effects of Nb content on microstructure and fracture behavior of near α titanium alloys[J].Materials&Design (1980-2015), 2015, 66:267-273.
[5] 杨文涛,隆小庆.飞机上钛合金的特殊腐蚀形式[J].全面腐蚀控制, 2008, 22(2):42-45. [6] 郭亮,梁成浩,隋洪艳.模拟体液中纯钛及Ti6-Al4V合金的腐蚀行为[J].中国有色金属学报, 2001, 11(1):107-110. [7] 陶春虎,刘庆瑔,刘昌奎,等著.航空用钛合金的失效及其预防(第2版)[M].北京:国防工业出版社, 2013. [8] 樊亚军,曹继敏,杨华斌,等.Fe含量对Ti-6Al-4V钛合金力学性能的影响[J].金属热处理, 2013, 38(3):21-23. [9] 王海杰,王佳,彭欣,等.钛合金在3.5% NaCl溶液中的腐蚀行为[J].中国腐蚀与防护学报, 2015, 35(1):75-80. [10] 张睿.钛及钛合金在海水中的应力腐蚀及氢脆敏感性研究[D].呼和浩特:内蒙古工业大学, 2013. [11] PILCHAK A L,YOUNG A H,WILLIAMS J C.Stress corrosion cracking facet crystallography of Ti-8Al-1Mo-1V[J].Corrosion Science, 2010, 52:3287-3296.
[12] 段薇薇,淡振华,常辉,等.应变速率对TC4-0.55% Fe合金在模拟海水中应力腐蚀行为的影响[J].腐蚀与防护, 2018, 39(9):689-693. [13] 仝宏韬,张慧霞,胡鹏飞,等.深海环境下典型钛合金材料的应力腐蚀研究[C].2018年全国腐蚀电化学及测试方法学术交流会,北京, 2018年7月. [14] 郝文魁,刘智勇,杜翠薇,等.35CrMo钢在酸性H2S环境中的应力腐蚀行为与机理[J].机械工程学报, 2014, 50(4):39-46. [15] 孙敏,李晓刚,李劲.新型超高强度钢Cr12-Ni4Mo2Co14在酸性环境中的应力腐蚀行为[J].金属学报, 2016, 52(11):1372-1378. [16] 马宏驰,杜翠薇,刘智勇,等.E690高强钢在SO2污染海洋大气环境中的应力腐蚀行为研究[J].金属学报, 2016, 52(3):331-340.
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