Energetic evaluation of press hardening processes

Meza-García, Enrique; Rautenstrauch, Anja; Bräunig, Michael; Kräusel, Verena; Landgrebe, Dirk

doi:10.1016/j.promfg.2019.04.045

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…Consequently, this allows a more robust process control and, in addition, a significantly lower austenitization temperature. In comparison to manganese boron steels, the austenitization temperature of medium manganese steels can be lowered by 100-200 °C [15], which is associated with considerably reduced energy consumption [16]. Furthermore, the lower austenitization temperature leads to a comparatively finer microstructure, which positively influences both the strength and the ductility of the material, respectively [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application

Blankart

Wesselmecking

Krupp

2021

Metals

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It has been proven that through targeted quenching and partitioning (Q & P), medium manganese steels can exhibit excellent mechanical properties combining very high strength and ductility. In order to apply the potential of these steels in industrial press hardening and to avoid high scrap rates, it is of utmost importance to determine a robust process window for Q & P. Hence, an intensive study of dilatometry experiments was carried out to identify the influence of quenching temperature (TQ) and partitioning time (tp) on phase transformations, phase stabilities, and the mechanical properties of a lean medium manganese steel. For this purpose, additional scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and energy dispersive X-ray spectroscopy (EDX) examinations as well as tensile testing were performed. Based on the dilatometry data, an adjustment of the Koistinen–Marburger (K-M) equation for medium manganese steel was developed. The results show that a retained austenite content of 12–21% in combination with a low-phase fraction of untempered secondary martensite (max. 20%) leads to excellent mechanical properties with a tensile strength higher than 1500 MPa and a total elongation of 18%, whereas an exceeding secondary martensite phase fraction results in brittle failure. The optimum retained austenite content was adjusted for TQ between 130 °C and 150 °C by means of an adapted partitioning.

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Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application

Blankart

Wesselmecking

Krupp

2021

Metals

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“…To demonstrate the advantages of the carburized complex phase steel, the holding time is increased to 6 min. Considering the additional time for the heating process, the overall heat treatment process is slightly longer than conventional austenitization procedures at 900 °C with around 6 min [ 57 ] in total. However, minor incidents in the production cycle could result in a prolongation of the furnace lead time.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Horn

Merklein

2021

Materials

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Prior carburization of semi-finished steel sheets is a new process variant in hot stamping to manufacture parts with tailored properties. Compared to conventional hot stamping processes, a complex phase typed steel alloy is used instead of 22MnB5. Yet recent investigations focused on final mechanical properties rather than microstructural mechanisms cause an increase in strength. Thus, the influence of additional carburization on the microstructural evolution during hot stamping of a complex phase steel CP-W®800 is investigated within this work. The phase transformation behavior, as well as the grain growth during austenitization, is evaluated by in-situ measurements employing a laser-ultrasound sensor. The results are correlated with additional hardness measurements in as-quenched condition and supplementary micrographs. The experiments reveal that the carburization process significantly improves the hardenability of the CP-W®800. However, even at quenching rates of 70 K/s no fully martensitic microstructure was achievable. Still, the resulting hardness of the carburized samples might exceed the fully martensitic hardness of 22MnB5 derived from literature. Furthermore, the carburization process has no adverse effect on the fine grain stability of the complex phase steel. This makes it more robust in terms of grain size than the conventional hot stamping steel 22MnB5.

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“…Nevertheless, press hardening process is significantly more energy demanding than conventional stamping or deep drawing processes. In best-case scenario, more than 69% of the energy related to forming is consumed during the heating and related operations in press hardening [3].…”

Section: Introductionmentioning

confidence: 99%

Heat assisted V-bending characteristics of high strength S700MC steel

Görtan

2023

Materials Research Proceedings

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Abstract. Increasingly stringent regulations force automotive manufacturers to reduce their product weights without compromising passenger safety. To overcome this problem, high strength steels are used that enable a higher payload capacity whilst reducing the plate thickness and overall weight. However, high strength steels are generally associated with lower formability and significantly greater springback compared to mild steels. In the current study, bendability characteristics of high strength S700MC steel in mild temperatures are investigated using V-bending tests. A temperature range between 25°C and 650°C is analysed. Springback characteristics as well as hardness distribution along the thickness direction in the bent area is investigated for several bent samples.

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Energetic evaluation of press hardening processes

Cited by 7 publications

References 3 publications

Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application

Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Heat assisted V-bending characteristics of high strength S700MC steel

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