Advanced Dilatometry and Calorimetry for the Validation of Materials Mechanical and Transformation Models

Reich, Michael; Milkereit, Benjamin; Krawutschke, Matthias; Kalich, Jan; Schick, Christoph; Keßler, Olaf

doi:10.1007/978-3-319-48194-4_28

Cited by 1 publication

(6 citation statements)

References 7 publications

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“…Thereby the sensitivity of the DSC but also dilatometric measurements could be increased significantly. 15 However, those new methods must be applied for the low carbon press hardened steel 22MnB5. Necessary heating rates were estimated from typical short-time tempering temperatures of up to 700uC and typical clinching process durations of a few seconds.…”

Section: Methodsmentioning

confidence: 99%

“…For the evaluation of characteristic temperatures, the first significant negative difference between normalised and press hardened state as well as peak temperature are determined. 15 Generally, the heating tests in the dilatometer are characterised by a very good repeatability. As a further step to qualify the necessary heat treatment parameters for clinching of press hardened steel 22MnB5, its mechanical behaviour is important to be known.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Therefore measurements of inert reference materials have proven to be suitable for DSC 12 and were established for dilatometry recently. 15 For the measurement of press hardened steel 22MnB5, normalised samples have been produced as inert reference material. Normalising of steel 22MnB5 was performed at 920°C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Short-time heat treatment of press hardened steel for laser assisted clinching

Reich

Osten

Milkereit

et al. 2014

Materials Science and Technology

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Clinching of high strength steels is currently difficult due to their relative low ductility. Hence a new method has been developed to clinch these steel grades. This could be achieved by heating the sheets locally at the joint by a laser during the clinching process. The short-time tempering behaviour of the press hardened steel 22MnB5 has been investigated by dilatometry respectively calorimetry experiments. Different stages of the tempering process have been identified depending on heating rates up to 1000 K s−1. Characteristic tempering reactions were shifted to higher temperatures with increasing heating rate. Based on these results, suitable short-time heat treatment parameters have been selected and transferred to the clinching process. Thereby the press hardened steel 22MnB5 has been successfully clinched with laser assistance for the very first time. The laser assisted clinched joint has been characterised by metallographic analysis and hardness testing. It could be shown, that in the clinching joint only a slight strength loss occurs due to the introduced laser heat.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations