Effect of cast iron surface treatment on interfacial adhesion of Al/Fe compound cast structure
| dc.contributor.author | Heshmati, Nader | |
| dc.contributor.department | Chalmers tekniska högskola / Institutionen för industri- och materialvetenskap | sv |
| dc.contributor.examiner | Nyborg, Lars | |
| dc.contributor.supervisor | Tricoire, Aurélien | |
| dc.date.accessioned | 2020-09-24T08:44:04Z | |
| dc.date.available | 2020-09-24T08:44:04Z | |
| dc.date.issued | 2020 | sv |
| dc.date.submitted | 2020 | |
| dc.description.abstract | Development of the light weight material is necessary for cost optimization and reducing environmental pollution in the automotive industry. However, the aluminum solely does not provide the desired mechanical properties such as wear-resistance and stiffness and it is needed to be combined with ferrous inserts. Compound casting is used as the joining method of Al/Fe components due to its cost-efficiency in which molten aluminum is solidified around a solid ferrous insert to form a metallurgical bonding at the Al/Fe interface. This Metallurgical bonding provides the integrity of the component, and therefore requires to be strong enough to withstand all stresses during the casting process as well as the consumption stage. The formation of a compact reaction layer is restricted by the wetting behaviour of the aluminum and oxide formation on the insert and the aluminum. In this study, the effect of different cast iron insert surface treatments on the bond formation of the interface between cast iron and AlSi7Mg were investigated. As-cast condition, cleaning, etching, sandblasting, hot-dip galvanizing, acidic zinc plating, hot-dip aluminizing, and thermal spraying samples were pre-heated, followed by gravity casting in a pre-heated mold. The Al/Fe interface was studied by optical and scanning electron microscope (SEM) with a focus on the formation of the oxide and diffusion reaction layer. The results indicated that the diffusion layer formation was suppressed due to the presence of an oxide layer that was formed during the preheating stage. The shear strength of the Al/Fe interface was assessed by the pushout test and the result was compared with microstructural changes at the interface. The correlation between the surface roughness of the inserts, their microstructure, and mechanical properties was also discussed. Based on the obtained result, a new cast experiment has been designed by blasting+aluminizing of the cast iron insert, removing the pre-heating, and instant casting after the aluminizing process to ensure the formation of the metallurgical bonding during the compound casting. | sv |
| dc.identifier.coursecode | IMSX30 | sv |
| dc.identifier.uri | https://hdl.handle.net/20.500.12380/301767 | |
| dc.language.iso | eng | sv |
| dc.setspec.uppsok | Technology | |
| dc.subject | Cast iron inserts | sv |
| dc.subject | Interface reaction layer | sv |
| dc.subject | Interface shear strength | sv |
| dc.subject | Al/Fe Compound casting | sv |
| dc.title | Effect of cast iron surface treatment on interfacial adhesion of Al/Fe compound cast structure | sv |
| dc.type.degree | Examensarbete för masterexamen | sv |
| dc.type.uppsok | H |