Local laser heat treatment in dual-phase steels

Asadi, Mehdi, Frommeyer, Georg, Aghajani, Ali, Timokhina, Ilana and Palkowski, Heinz 2012, Local laser heat treatment in dual-phase steels, Metallurgical and materials transactions A, vol. 43, no. 4, pp. 1244-1258.

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Title Local laser heat treatment in dual-phase steels
Author(s) Asadi, Mehdi
Frommeyer, Georg
Aghajani, Ali
Timokhina, Ilana
Palkowski, Heinz
Journal name Metallurgical and materials transactions A
Volume number 43
Issue number 4
Start page 1244
End page 1258
Total pages 15
Publisher Springer New York LLC
Place of publication New York, N. Y.
Publication date 2012-04
ISSN 1073-5623
Keyword(s) dual-phase steels
local laser heat treatment
light optical microscopy
scanning electron microscopy
transmission electron microscopy
Summary This research deals with processes leading to local strengthening effects in hot-rolled dual-phase (DP) steels. For this purpose, a method was investigated to achieve local strengthening, namely, local laser heat treatment (LHT). DP sheet steels were globally and homogenously deformed with different degrees of prestrains by cold rolling and subsequently locally heat treated by laser. Following this treatment with selected parameters, the microstructure of the surface and cross section of the heat-treated area as well as the mechanical properties were evaluated by light optical microscopy (LOM), scanning electron microscopy (SEM), as well as transmission electron microscopy (TEM), hardness measurement, and tensile testing. It can be stated that with partial heat treatment, local high strengthening can be produced. At lower heat treating temperatures, this effect could be attributed to bake hardening (BH). Increasing the prestrain as well as temperature results in improving the local properties. With increased heat treating temperature, the initial microstructure near the surface is affected. Partial strengthening of DP steels by laser can open up new fields of application for locally using the strengthening effect to only influence relevant areas of interest, thus providing the potential for saving energy and designed the component's behavior.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, The Minerals, Metals & Materials Society and ASM International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044085

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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