Heat Treatment and Material Characterization of WAAM Manufactured Tool Steel
Balog, Daniela (2022)
2022
Master's Programme in Materials Science and Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2022-12-22
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202212209423
https://urn.fi/URN:NBN:fi:tuni-202212209423
Tiivistelmä
This thesis comes to bring a bit more insight into the post-process of tool steels that are produced using a specific type of additive manufacturing. The goal was to test various heat treatments on a type of tool steel, manufactured by wire arc additive manufacturing, and to find which heat treatment offers the highest hardness value.
Four samples were used for the experimental part of this thesis. All these samples were cut from the same wall, manufactured by wire arc additive manufacturing. Three were heat treated and one sample was used as a reference. Subsequently, these samples were analysed and tested to find their hardness values as well as their microstructural characteristics.
While all the samples presented a more homogeneous microstructure, compared to the reference one, the hardness values of all three heat-treated samples were lower than the hardness value of the reference sample. The highest hardness of the three samples was obtained after a double tempering at temperatures above 600⁰C. The other two samples, that were hardened and quenched before double tempering had significantly lower hardness.
Four samples were used for the experimental part of this thesis. All these samples were cut from the same wall, manufactured by wire arc additive manufacturing. Three were heat treated and one sample was used as a reference. Subsequently, these samples were analysed and tested to find their hardness values as well as their microstructural characteristics.
While all the samples presented a more homogeneous microstructure, compared to the reference one, the hardness values of all three heat-treated samples were lower than the hardness value of the reference sample. The highest hardness of the three samples was obtained after a double tempering at temperatures above 600⁰C. The other two samples, that were hardened and quenched before double tempering had significantly lower hardness.