Abstract
In this article, the fracture behavior of different AlSi coating micro-structures is investigated. By changing the heating temperature, different AlSi coating micro-structures are obtained, due to varying diffusivity of iron. To study the fracture behavior of different coating micro-structures, uniaxial tensile tests are conducted at 700 °C. The hot tensile test involves heating the as-coated press hardening steel in a furnace to heating temperatures of 750, 920 and 1000 °C for 6 minutes of dwell time, after which the sample is cooled to the deformation stage at 700 °C. In this stage, the samples are uniaxially deformed for a fixed 20% macroscopic strain followed by cooling to room temperature. After the test, the coating micro-structure and fracture pattern are inspected under the microscope. For samples heated to 750 and 920 °C, coating fracture is observed; however, for samples heated to 1000 °C, no coating fracture is observed during the tensile deformation at 700 °C. The AlSi coating micro-structure, after heating at 1000 °C becomes sufficiently ductile to withstand 20% strain at 700 °C. The same micro-structure, however, fractures during uniaxial tensile deformation at 600 °C.
Highlights
Hot stamping is a process which combines the heat treatment and deformation at elevated temperatures
During deformation at high temperatures, it has been reported that the aluminum with wt.% silicon (AlSi) coating layer fractures, resulting in tool wear and an oxidized substrate [4, 5]
Objective of this study The goal of this study is to experimentally investigate the fracture behavior of different AlSi coating micro-structures under uniaxial tension at 700 ◦C
Summary
Hot stamping is a process which combines the heat treatment and deformation at elevated temperatures. During this process, steels are susceptible to decarburization and oxidation, both of which hamper its quality and strength. Steel sheets are generally coated prior to hot stamping. For press hardening steels (PHS), aluminum with 10 wt.% silicon (AlSi) coating is generally used for the hot stamping operation. By generating a dense alumina scale on the surface, an oxidation-resistant coating layer is obtained [1, 2]. During deformation at high temperatures, it has been reported that the AlSi coating layer fractures, resulting in tool wear and an oxidized substrate [4, 5]
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