Local laser heat treatment in dual-phase steels


Autoria(s): Asadi, Mehdi; Frommeyer, Georg; Aghajani, Ali; Timokhina, Ilana; Palkowski, Heinz
Data(s)

01/04/2012

Resumo

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.<br />

Identificador

http://hdl.handle.net/10536/DRO/DU:30044085

Idioma(s)

eng

Publicador

Springer New York LLC

Relação

http://dro.deakin.edu.au/eserv/DU:30044085/timokhina-locallaser-2011.pdf

http://hdl.handle.net/10.1007/s11661-011-0943-1

Direitos

2011, The Minerals, Metals & Materials Society and ASM International

Palavras-Chave #dual-phase steels #local laser heat treatment #light optical microscopy #scanning electron microscopy #transmission electron microscopy
Tipo

Journal Article