Influence of cold rolling on the fatigue crack growth behavior of tungsten

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:805

Article

Pillmeier, Simon¹  Zak, Stanislav²  Pippan, Reinhard²  Hohenwarter, Anton¹ 

[1] Univ Leoben, Dept Mat Sci, Chair Mat Phys, Jahnstr 12, A-8700 Leoben, Austria

[2] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

关键词: Fatigue crack growth;    Tungsten;    Ultrafine-grained materials;    Severe plastic deformation;    Cold rolling;    Anisotropy;   

DOI  :  10.1016/j.msea.2021.140791

来源: Elsevier

【 摘 要 】

The influence of cold rolling on the fatigue crack growth (FCG) behavior of pure tungsten was investigated. For that tungsten sheets with three different thicknesses (2 mm, 1 mm and 100 mu m) corresponding to different degrees of deformation were selected to prepare compact-tension (CT) and single edge notched tension (SENT) specimens. To account for orientation influences the crack propagation direction parallel, perpendicular and under 45 degrees to the rolling direction was investigated. It could be shown that a pronounced cyclic R-curve behavior evolves, leading to relatively high thresholds of stress intensity factor range Delta Kth, even at high load ratios. Furthermore, for the smallest grain size a pronounced anisotropy of the FCG behavior was observed where the crack growth direction perpendicular to the rolling direction exhibits the highest Delta Kth and the lowest crack growth-rates. Especially the tungsten foils with 100 mu m thickness showed stable crack growth with a pronounced Paris-regime. As a consequence, cold rolled tungsten qualifies as a fatigue resistant laminate material applicable for future structural applications in harsh environments.

【 授权许可】

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