Fracture toughness assessment of surface cracks in slender ultra-high-strength steel plates

Hultgren, Gustav; Boåsen, Magnus; Narström, Torbjörn; Barsoum, Zuheir

doi:10.1016/j.engfracmech.2023.109458

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…So, many efforts are made to make automobiles lightweight [6][7][8]. During the past few decades, vehicle components, including A-pillars, B-pillars, roof rails, and so on, have been made with ultra-high-strength steels as an ideal material [9][10][11][12]. In this context, ultra-high-strength hot stamping steels have been investigated and used to make vehicle parts [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Study of Hardness Evolution during the Tempering Process of 38MnB5Nb Ultra-High-Strength Hot Stamping Steel: Experimental Analysis and Constitutive Models

Luo,

Li,

Zhang

et al. 2023

Metals

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To elucidate the hardness evolution behaviors for 38MnB5Nb ultra-high-strength hot stamping steel, a series of tempering processes with varying tempering temperatures and times were carried out with a dilatometer. Meanwhile, the hardness of each sample was measured after dilatometer experiments. The results indicated that the tempering process parameters (including the tempering temperature and time) play an important role in the hardness of the studied steel. The hardness of 38MnB5Nb ultra-high-strength hot stamping steel at the quenched state is about 580 Hv, while it is 240 Hv for the quasi-annealed state. As the tempering time extends, the hardness is decreased sharply at the initial stage; then, the hardness is decreased in a quasi-linear trend with a slight slope; finally, the hardness almost keeps a constant value, which depends on the tempering temperature. In addition, the tempering process has a big effect on the mechanical properties of 38MnB5Nb ultra-high-strength hot stamping steel by increasing the product of the strength and elongation by about 40%.

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