Thermal Simulation Analysis of localized heating of martensitic steel in a continuous line
2023 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE credits
Student thesis
Abstract [en]
Advanced high strength low alloy steels are mainly used in the automotive industry where low weight and high strength are two of the main criteria, shortly followed by formability. These materials are under constant development to be stronger and perform better. These steels consist of a martensite structure and have high yield and tensile strength with limited ductility and formability.
To increase the formability of these martensitic steel types, it is necessary to apply tempering treatment, however, if done incorrectly, it might also deteriorate the properties of the material.
Earlier investigations have suggested that with the pre-known bending positions in roll forming operations of coiled steel, efforts can be made to preheat the pre-known areas, enabling better formability.
This report's main goal has been to investigate whether localized heating/tempering in pre-known specific locations is possible or not. The main criteria for the localized tempering task have been to apply the desired temperature which can be achieved at the rate at which the movement of the continuous annealing line at SSAB Borlänge.
This investigation will be made using FEA simulation software, to accurately depict localized heating scenarios considering different variables. The results of this investigation show that it is possible to apply the desired temperature with some local laser heating devices into the continuous annealing line, accommodating the rate of heating as well.
Place, publisher, year, edition, pages
2023.
Keywords [en]
local heating simulation, ANSYS, moving heat flux, moving heat ACL, continuous annealing line, local softening, martensitic low alloy carbon steels, numerical analysis, tempering
National Category
Mechanical Engineering Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:du-46020OAI: oai:DiVA.org:du-46020DiVA, id: diva2:1756491
External cooperation
SSAB
Subject / course
Mechanical Engineering
2023-05-122023-05-122023-05-12Bibliographically approved