2019
DOI: 10.2351/1.5052147
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Local laser softening of high-strength steel with an adapted intensity

Abstract: Today, manufacturers in the automotive industry have to find a compromise between ensuring maximum safety for passengers, which is achieved by the use of high stiffness materials, and a minimum CO2 footprint. These aims are achieved primarily by the usage of lightweight designs. With respect to the car body, high-strength steels—such as the manganese boron steel MBW® 1500 (22MnB5)—fulfil these requirements. Workpieces made of 22MnB5 have a high tensile strength of about 1500 MPa, respectively, enabling reducti… Show more

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Cited by 12 publications
(6 citation statements)
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“…We have used these algorithms to design freeform optics that generate application-adapted intensity distributions for laser hardening [9] and laser softening [10]. The optics have been fabricated, integrated, and validated in experimental setups and advantages such as an increase in processing quality and efficiency have been demonstrated.…”
Section: Freeform Opticsmentioning
confidence: 99%
See 1 more Smart Citation
“…We have used these algorithms to design freeform optics that generate application-adapted intensity distributions for laser hardening [9] and laser softening [10]. The optics have been fabricated, integrated, and validated in experimental setups and advantages such as an increase in processing quality and efficiency have been demonstrated.…”
Section: Freeform Opticsmentioning
confidence: 99%
“…To this end, we defined the situation as an inverse heat conduction problem which is solved numerically by using the conjugate gradient method with adjoint problem. The method has been validated for laser hardening [9], laser softening [10], and laser-assisted tape-placement [11]. Additionally, we have suggested methods for realizing the resulting, very complex intensity distributions using cutting-edge optical elements such as freeform optics [9][10], VCSELs [11], and diffractive neural networks [12].…”
Section: Introductionmentioning
confidence: 99%
“…The specified width of the treatment zone cannot be obtained by known methods of local heating other than laser irradiation, since these do not possess a high power density [89]. In [90,91], the authors demonstrate the possibility of the implementation of processes of alloy recrystallization at the high temperatures and short exposure times that occur in the case of laser heating. Herewith, a slow heat removal is realized when the thickness of the processed material is comparable to the size of the heat-affected zone.…”
Section: Local Laser Annealing Of Metallic Sheet Materialsmentioning
confidence: 99%
“…In laser materials processing, application-adapted intensity distributions gain importance, as they enable an increase in productivity and/or the quality of the processing result [1][2][3][4][5]. Such intensity distributions can range from simple homogeneous distributions (so-called top-hat distributions) [6] or donut shapes [7] to process-specific distributions, which are derived by solving the inverse heat-conduction problem [8].…”
Section: Introductionmentioning
confidence: 99%