全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
材料工程  2004 

含氢的Ti-2Al-2.5Zr合金的静态和动态断裂行为研究

, PP. 19-22

Keywords: ,钛合金,疲劳,延迟断裂,裂纹扩展速率

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用紧凑拉伸(CT)试样,研究了含氢110μg/g的Ti-2Al-2.5Zr钛合金在室温的静载延迟裂纹扩展(da/dt)和疲劳加载裂纹扩展(da/dN)行为,用扫描电镜观察了断口形貌。结果表明,Ti-2Al-2.5Zr合金含氢110μg/g即足以引起材料的静载氢致延迟断裂,氢在裂纹尖端扩散聚集并析出氢化物,导致材料变脆,是氢致延迟断裂的微观机制;而相同含氢量时对疲劳断裂过程的影响微弱,疲劳断裂受通常的裂纹萌生、稳态扩展和瞬断机制控制。

References

[1]  SHIH D S, ROBERTSON I M. Hydrogen embrittlement of alpha titanium[J]. Acta Metall,1988,36:111-124.
[2]  HALL I W, HAMMOND C. In situ electron microscopy observations of strain-induced hydrides in α titanium alloy[J]. Metal Science, 1978, 7: 339-342.
[3]  PETIT J,HENAFF G,SARRAZIN-BAUDOUX C. Mechanism and modeling of near-threshold fatigue crack propagation[A]. Fatigue Crack Growth Thresholds, Endurance, Limits and Design[C]. Conshocken PA: ASTM Special Technical Pubication, No.1372, 2000. 3-30.
[4]  PAO P S, FENG C R,GILL S G.Hydrogen-assisted fatigue crack growth in β-annealed Ti-6Al-4V[J]. Scripta Materilia,1998,40(11), 19-26.
[5]  GAO S, et al. Fatigue crack growth for Ti-6Al-4V alloy in water[J].Acta Metallurgica Sinica, 1986,22(6): A195-A200.
[6]  PARIS P C, GOMEZ M P,ANDERSON W P. A rational analytic theory of fatigue[J].The Trend in Engineering, 1961,13: 9-14.
[7]  SURESH S. Fatigue of materials[M].London: Cambridge University Press, 1991. 193-274.
[8]  MOODY N R,COSTA J E,KIM Y W,BOYER R P. Review of microstructure effects on hydrogen-induced sustained load cracking in structural titanium alloys[A]. Proceedings of the Symposium on Microstucture /Property Relationships in Titanium Aluminides and Alloys[C]. 1991. 587-604.
[9]  SASTRY S M L,et al. Subcritical crack-growth under sustained load in Ti-6Al-6V-2Sn[J]. Metall Trans A, 1981,12A:83-94.
[10]  ISHIYAMA S,FUKAYA K,ETO M,MIYA N.Metal-hydride characterization and mechanical properties of Ti-6Al-4V alloy[J]. Journal of Nuclear Science and Technology, 2000, (37)2: 144-152.
[11]  YEH M S, et al. Hydrogen-induced subcritical crack growth in Ti-6Al-4V alloy[J]. Mat Sci and Eng A, 1998, 242: 96.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133