Open AccessEffect of heating temperatures on AlSi coating microstructure and fracture during hot-tensile tests
Author(s) -
Shakil Bin Zaman,
Javad Hazrati,
M.B. de Rooij,
A.H. van den Boogaard
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1157/1/012018
Subject(s) - materials science , coating , composite material , ultimate tensile strength , microstructure , tensile testing , deformation (meteorology) , strain hardening exponent , fracture (geology) , hardening (computing) , metallurgy , layer (electronics)
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.