Knowledge Management System of Institue of Mechanics, CAS
| Measurement Of Fracture Toughness And Interfacial Shear Strength Of Hard And Brittle Cr Coating On Ductile Steel Substrate | |
Yang BQ(杨班权); Zhang K(张坤) ; Chen GN(陈光南); Luo GX(罗耕星); Xiao JH(肖京华); Yang, BQ (reprint author), Armored Force Engn Inst, Dept Mech Engn, Div Engn Mech, 21 Jia Kan, Beijing 100072, Peoples R China.
| |
| Source Publication | Surface Engineering
 |
| 2008 | |
| Pages | 332-336 |
| ISSN | 0267-0844 |
| Abstract | The fracture toughness and interfacial adhesion properties of a coating on its substrate are considered to be crucial intrinsic parameters determining performance and reliability of coating-substrate system. In this work, the fracture toughness and interfacial shear strength of a hard and brittle Cr coating on a normal medium carbon steel substrate were investigated by means of a tensile test. The normal medium carbon steel substrate electroplated with a hard and brittle Cr coating was quasi-statically stretched to induce an array of parallel cracks in the coating. An optical microscope was used to observe the cracking of the coating and the interfacial decohesion between the coating and the substrate during the loading. It was found that the cracking of the coating initiated at critical strain, and then the number of the cracks of the coating per unit axial distance increased with the increase in the tensile strain. At another critical strain, the number of the cracks of the coating became saturated, i.e. the number of cracks per unit axial distance became a constant after this critical strain. Based on the experiment result, the fracture toughness of the brittle coating can be determined using a mechanical model. Interestingly, even when the whole specimen fractured completely under an extreme strain of the substrate, the interfacial decohesion or buckling of the coating on its substrate was completely absent. The test result is different from that appeared in the literature though the identical test method and the brittle coating/ductile metal substrate system are taken. It was found that this difference can be attributed to an important mechanism that the Cr coating on the steel substrate has a good adhesion, and the ultimate interfacial shear strength between the Cr coating and the steel substrate has exceeded the maximum shear flow strength level of the steel substrate. This result also indicates that the maximum shear flow strength level of the ductile steel substrate can be only taken as a lower bound estimate on the ultimate shear strength of the interface. This estimation of the ultimate interfacial shear strength is consistent with the theoretical analysis and prediction presented in the literature. |
| Keyword | Hard And Brittle Coating Fracture Toughness Ductile Steel Substrate Interfacial Shear Strength Tensile Test Thermal Barrier Coatings Thin-films Adhesion Cracking Decohesion Behavior Indentation Chromium Erosion Tensile |
| DOI | 10.1179/174329408X282587 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000259639000004 |
| WOS Keyword | THERMAL BARRIER COATINGS ; THIN-FILMS ; ADHESION ; CRACKING ; DECOHESION ; BEHAVIOR ; INDENTATION ; CHROMIUM ; EROSION ; TENSILE |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Coatings & Films |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/25894 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Yang, BQ (reprint author), Armored Force Engn Inst, Dept Mech Engn, Div Engn Mech, 21 Jia Kan, Beijing 100072, Peoples R China. |
| Recommended Citation GB/T 7714 | Yang BQ,Zhang K,Chen GN,et al. Measurement Of Fracture Toughness And Interfacial Shear Strength Of Hard And Brittle Cr Coating On Ductile Steel Substrate[J]. Surface Engineering,2008:332-336. |
| APA | 杨班权,张坤,陈光南,罗耕星,肖京华,&Yang, BQ .(2008).Measurement Of Fracture Toughness And Interfacial Shear Strength Of Hard And Brittle Cr Coating On Ductile Steel Substrate.Surface Engineering,332-336. |
| MLA | 杨班权,et al."Measurement Of Fracture Toughness And Interfacial Shear Strength Of Hard And Brittle Cr Coating On Ductile Steel Substrate".Surface Engineering (2008):332-336. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp157.pdf（309KB） | 开放获取 | -- | View Download | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment