Influence of coating thickness on the impact damage mode in Fe-based amorphous coatings
Influence of coating thickness on the impact damage mode in Fe-based amorphous coatings
复制标题
涂层厚度对铁基非晶涂层冲击损伤模式的影响
DOI：
10.1016/j.surfcoat.2020.125650
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发表时间：
2020-05
影响因子：
5.4
通讯作者：
Wang J. Q.
中科院分区：
文献类型：
--
作者：
Guo H.;Wu N. C.;Zhang Y. L.;Zhang S. D.;Sun W. H.;Wang J. Q.
利用三维X射线层析成像技术对不同厚度的铁基非晶涂层的冲击行为进行了系统研究。结果表明，冲击损伤主要表现为涂层开裂、基体塑性变形和涂层/基体界面分层。结果表明，界面脱层的大小是归一化涂层厚度stc/a（即涂层厚度（tc）与接触半径（a）之比）的非线性函数。在涂层厚度范围内，材料的损伤模式主要表现在三个区域：薄涂层区（tc/a ≤ 0.33）、中厚度区（0.33 <tc/a ≤ 0.54）和厚涂层区（tc/a> 0.54）。Fortc/a ≤ 0.33时，涂层/基体界面无分层。随着tc/a = 0.33~tc/a = 0.54的增大，界面分层程度迅速增大，并达到最大值。当c/a> 0.54时，分层程度随c/a的增大而减小。此外，还发现残余应力随涂层厚度的增加而减小，这表明残余应力不是冲击损伤的主要因素。此外，在界面损伤的情况下，Hertz冲击理论和有限元模型也能很好地吻合：当最大剪切应力发生在涂层/基体界面附近时，在600 μ m涂层中观察到明显的分层。这一发现可用于辅助设计涂层组件的承载应用。
The impact behavior of Fe-based amorphous coatings with various thicknesses fabricated by high-velocity-air-fuel thermal spraying was systematically investigated via 3D X-ray tomography. The results showed that the impact damage occurred principally by cracking in the coating, plastic deformation in the substrate, and delamination at the coating/substrate interface. It was found that the size of the interfacial delamination was a nonlinear function of the normalized coating thicknesstc/a(i.e. the ratio of coating thickness (tc) to the contact radius (a)). Three thickness regions of distinctive damage modes were identified: thin coating region (tc/a≤ 0.33), intermediate-thickness region (0.33 <tc/a≤ 0.54), and thick coating region (tc/a> 0.54). Fortc/a≤ 0.33, no delamination appeared in the coating/substrate interface. With an increase fromtc/a= 0.33 totc/a= 0.54, the extent of interfacial delamination increased quickly and reached a maximum. Finally, whentc/a> 0.54, the extent of delamination decreased whentc/aincreased. In addition, it was indicated that the residual stress was found to decrease with the coating thickness, reflecting that the residual stress was excluded as a predominant factor of impact damage. Furthermore, a good agreement with the Hertz impact theory and finite element modeling was identified in the case of interfacial damage: significant delamination was observed in the 600 μm coating when the maximum shear stress occurred close to the coating/substrate interface. This finding can be used to assist the design of coated components in load-bearing applications.
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影响因子：
3.1
作者：
S. Kuroda;Y. Tashiro;H. Yumoto;Susumu Taira;H. Fukanuma;S. Tobe
通讯作者：
S. Kuroda;Y. Tashiro;H. Yumoto;Susumu Taira;H. Fukanuma;S. Tobe
深入了解干湿循环条件下铁基非晶涂层的腐蚀演化
影响因子：
6.6
作者：
Wu J;Cui J P;Zheng Q J;Zhang S D;Sun W H;Yang B J;Wang J Q
通讯作者：
Wang J Q
影响因子：
5.4
作者：
E. Sadeghimeresht;N. Markocsan;P. Nylén
通讯作者：
E. Sadeghimeresht;N. Markocsan;P. Nylén
影响因子：
4.6
作者：
Wang W;Zhang C;Zhang ZW;Li YC;Yasir M;Wang HT;Liu L
通讯作者：
Liu L
影响因子：
64.8
作者：
D. Tabor
通讯作者：
D. Tabor