DataVXJournal of Laser ApplicationsPaper
journal article·2020-11-01

Local laser softening of cold forming steels

S. Vogt, A. Weisheit, J. H. Schleifenbaum

Journal of Laser Applications· Volume 32· Issue 4
Publisher page
Source abstract

Abstract

The use of as-rolled cold forming steels opens new potential for lightweight construction in the automotive industry. Cold-rolled grades with a tensile strength up to 1100 MPa are on the market. However, the high strength limits the cold forming performance. A local softening in areas of high degree of deformation can be a solution to this conflict. In this work, basic studies on softening of a sheet metal were conducted. A fiber-coupled diode laser with a maximum laser power of 12 kW and a rectangular laser spot were used for laser heat treatment of the steel grade ZE 1100. It is shown that a local softening can be achieved even with short term heating. The softening is due to partly or full recrystallization of the microstructure. The tensile strength and the yield point can be reduced by about half, and the elongation at break can be increased by a factor of seven.
Source: crossref · Quality: baseline

Research context

Metals & alloysMaterials processing

OpenAlex topics: Laser and Thermal Forming Techniques · Microstructure and Mechanical Properties of Steels · High Entropy Alloys Studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Industry Management, TRUMPF Laser- und Systemtechnik GmbH 1 , Johann-Maus-Straße 2, 71254 Ditzingen, Baden-Württemberg, Germany

Cladding and Heat Treatment, Fraunhofer Institute for Laser Technology 2 , Steinbachstraße 15, 52074 Aachen, Nordrhein-Westfalen, Germany

Additive Manufacturing and Functional Layers, Fraunhofer Institute for Laser Technology 3 , Steinbachstraße 15, 52074 Aachen, Nordrhein-Westfalen, Germany

Chair for Digital Additive Production, RWTH Aachen University 4 , Campus-Boulevard 73, 52074 Aachen, Nordrhein-Westfalen, Germany

Funding

Bundesministerium für Bildung und Forschung

References (10)

Show source-provided references
1. Simulationsbasierte Regelung der Laserhärtung von Stahl10.3139/105.100370 ↗
2. 1998 · 510.1007/978-3-642-58726-9_2 ↗
3. 2009
4. Local heat treatment of high strength steels with zoom-optics and 10kW-diode laser10.1117/12.908384 ↗
5. G. Bergweiler, “Lokale Wärmebehandlung mit Laserstrahlung zur Verbesserung der Umform- und Funktionseigenschaften von hochfesten Stählen,” Ph.D. thesis, RWTH Aachen University, 2013.
6. Laser softening of press hardened steel for novel automotive parts10.1142/9789813277984_0079 ↗
7. S. Vogt, “Lokale Laserentfestigung von Halbzeugen und Bauteilen aus hochfesten Stählen,” Ph.D. thesis, RWTH Aachen University, 2019.
8. Local laser softening of press-hardened steel at high feed rates10.2351/1.5039857 ↗
9. 2012 · 82
10. International Iron & Steel Institute