Effects of the Surface Defects on the Fatigue Crack Propagation Behavior of ZTC4 Titanium Alloy

Feng Xin; Qiu Jianke; Ma Yingjie; Liu Jinhu; Ding Xianfei; Guo Guangping; Lei Jiafeng; Nan Hai

doi:10.15980/j.tzzz.2019.05.002

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Effects of the Surface Defects on the Fatigue Crack Propagation Behavior of ZTC4 Titanium Alloy
Vol. 39, Issue 5, Pages: 469-471(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.05.002

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[1]冯新,邱建科,马英杰,刘金虎,丁贤飞,郭广平,雷家峰,南海.ZTC4钛合金铸件表面缺陷对疲劳裂纹扩展行为的影响[J].特种铸造及有色合金,2019,39(05):469-471.

Feng Xin, Qiu Jianke, Ma Yingjie, et al. Effects of the Surface Defects on the Fatigue Crack Propagation Behavior of ZTC4 Titanium Alloy. [J]. Special Casting & Nonferrous Alloys 39(5):469-471(2019)
[1]冯新,邱建科,马英杰,刘金虎,丁贤飞,郭广平,雷家峰,南海.ZTC4钛合金铸件表面缺陷对疲劳裂纹扩展行为的影响[J].特种铸造及有色合金,2019,39(05):469-471. DOI： 10.15980/j.tzzz.2019.05.002.

Feng Xin, Qiu Jianke, Ma Yingjie, et al. Effects of the Surface Defects on the Fatigue Crack Propagation Behavior of ZTC4 Titanium Alloy. [J]. Special Casting & Nonferrous Alloys 39(5):469-471(2019) DOI： 10.15980/j.tzzz.2019.05.002.

摘要

研究了铸造ZTC4钛合金表面缺陷对恒ΔK下疲劳裂纹扩展路径、速率、塑性应变的影响。采用高分辨透射X射线三维成像法、扫描电镜、网格法对疲劳裂纹扩展路径、形貌和塑性区进行表征。结果表明

疲劳裂纹扩展路径向缺陷位置偏转

缺陷附近裂纹扩展速率明显增加

表面缺陷与疲劳裂纹相交位置塑性变形量相对较大。

Abstract

Influence of surface defects on the fatigue crack path

propagating rate and plastic strain under constant ΔK was investigated.The fatigue crack paths

appearance and plastic region were characterized by 3D X-ray tomography

SEM and grid method.The results reveal that the fatigue crack can be deflected towards the surface defects.The fatigue crack rate is increased obviously near the defects

and the plastic deformation is relatively bigger at the intersection location of surface cracks and fatigue cracks.

关键词

ZTC4钛合金铸造缺陷疲劳裂纹塑性应变

Keywords

ZTC4 Titanium AlloyCast DefectsFatigue CracksPlastic Strain

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Fatigue Behavior of As-extruded AZ31 Magnesium Alloy