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Effect of Metallurgical Parameters on Hydrogen Absorption and Delayed Fracture in Martensitic Press Hardened Steels

Excerpt

Ultra high strength steels components for automotive applications are increasingly produced by hot stamping leading to low residual stresses and homogeneous microstructures. However as yield strength in these components increases beyond 1100MPa, a risk of hydrogen embrittlement fracture may occur before the painting operation or while the vehicle is in use. In this work the impact of annealing parameters and chemical composition on hydrogen absorption and delayed fracture resistance has been studied for model thin gauge bare martensitic steels obtained by tailored austenitizing and quenching treatments simulating the hot stamping process. A clear effect of chemical composition on hydrogen absorption at high temperature is highlighted. Moreover delayed fracture resistance is improved with the decreasing of Mn and P content.

Introduction
Materials and Experimental Methods
Results and Discussion
Conclusions
Acknowledgements
References

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