Fatigue resistance of press hardened 22MnB5 steels

Parareda, Sergi; Casellas, Daniel; Frómeta, David; Martínez, Marc; Lara, A.; Barrero, Anna; Pujante, Jaume

doi:10.1016/j.ijfatigue.2019.105262

Cited by 17 publications

(11 citation statements)

References 13 publications

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“…The highest use of hot-formed steels is in the Volvo XC (2nd generation since 2014) where 38% of the body mass of all the steels used are hot formed [1]. The hot stamping process enables the production of these lighter parts with excellent ultimate tensile strength (UTS), up to around 1500 MPa [6]. Press hardening was initially developed for boron steels.…”

Section: Introductionmentioning

confidence: 99%

Study of Transition Areas in Press-Hardened Steels in a Combined Tool for Hot and Cold Forming

et al. 2023

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Press-hardening, also known as hot stamping, is a manufacturing process for producing car body parts that must meet the high demands of their mechanical properties and safety parameters. Moreover, these components often require different mechanical properties in different parts of the component. This work presents the press-hardening process in a special combined tool where one half of the tool is heated and the other half is cooled. The cooled part has been 3D printed due to the complexity of the internal cooling channels. The aim of this work is to investigate the variation of the microstructures in the sheet metal and the mechanical properties in relation to the cooling process in the tool and to determine the transition area where these properties cross over. Two steels were chosen for the experiment. The most commonly used steel 22MnB5, and an experimental high-strength steel with 0.2% C alloyed with manganese and aluminium. A temperature of 425 °C was set in the heated part of the tool, and different holding times in the tool were tested. In the heated part of the tool, a bainitic structure with a fraction of ferrite and retained austenite was formed, while in the quenched part of the tool, a martensitic transformation was promoted due to rapid cooling. In addition to microscopic analyses, mechanical tests and hardness measurements were also performed.

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Section: Introductionmentioning

confidence: 99%

Study of Transition Areas in Press-Hardened Steels in a Combined Tool for Hot and Cold Forming

et al. 2023

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“…Articles [18][19][20] show that stress behavior in PHS is subject to surface irregularities, such as crack defects in the coating and shear edge defects, which act as the sites of initiation and growth of fatigue cracks. These effects can be reduced by conducting lead-piercing or sandblasting operations that smooth the surface and eliminate internal stresses, as noted in articles [21][22][23] that of uncoated PHS and AHSS. However, the stress resistance of PHS may also depend on the microstructure of both the coating [24][25][26][27] and the bulk material [28], which is strongly dependent on the heat treatment conditions during the pressure hardening process [29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behaviour of Tempered and Isothermal Heat Treated Aisi 5160 Leaf Spring Steel

2023

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The oil quench and temper technique have a lot of benefits for heavy duty spring manufacture since it may expose the best balance of toughness and ductility, as well as increase fatigue life. The current study looked at the fatigue behavior of tempered AISI 5160 leaf spring steel samples at tempering temperatures of 400, 450, 500, 550, and 600 °C, as well as isothermally heat- treated steel samples at 830 °C. All leaf spring steel samples that had undergone thermal tempering and isothermal heat treatment were then tested up to fracture utilizing rotational fatigue test equipment under the effect of various stress levels. All steel samples subjected to tempering heat treatments of 400°C to 600°C showed a decrease in hardness ratings. The Rockwell hardness ratings of the steel samples that treated to isothermal heat treatment increased significantly. Experimental fatigue testing revealed that the values of fatigue resistance for steel samples tempered at (400 and 450) °C temperatures dropped by a small amount. The fatigue resistance values for steel specimens tempered at 500 °C to 600 °C temperatures decreased more than the values for steel samples tempered at 500 to 600 °C temperatures. A fatigue resistance of steel samples that were treated to isothermal heat treatments, on the other hand, increased. Steel samples that were isothermally heat-treated at 830 °C and then chilled in a salt brine solution, on the other hand, showed an increase in fatigue resistance

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“…Components made by the press hardening process and achieving an ultimate tensile strength of 1400-1500 MPa are nowadays widely used in critical body-in-white parts especially when crashworthiness and weight reduction are key design requirements. However, in the case of agricultural and commercial vehicle applications, the involved structures have to endure long and extremely varied dynamic service loads so that fatigue emerges as the prevalent failure mechanism [3,4]. The employed component wall gages are considerably thicker than in the case of light vehicle body-in-white (BIW) components, mainly due to stiffness requirements.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance of Laser Welds in Heavy-Gage Press Hardening Steels

Almeida

Bianchi

Souza

et al. 2022

Metals

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This work investigates and compares the fatigue performance of laser-welded joints of two press hardening steels: a standard 22MnB5 and a variant modified by a combination of niobium and molybdenum (NbMo) alloying. The results indicate that joint geometry aspects, superposed to an intrusion-generated damage mechanism, were prevalent in causing a poor fatigue life in the case of peak stress values greater than 11% of the base metal's ultimate strength being around 1450 MPa. As identical process procedures were employed, the tests allowed investigating the influence of the alloy design on fatigue performance. The results of geometrical analysis and fatigue tests indicated that the NbMo modified alloy performed better than the standard 22MnB5 steel. The results also suggest that, if extremely tight quality limits are used in the manufacturing procedures, laser-welded joints of press hardened steels could offer a very favorable fatigue performance being considerably better than that of conventional and high strength structural steels.

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Fatigue resistance of press hardened 22MnB5 steels

Cited by 17 publications

References 13 publications

Study of Transition Areas in Press-Hardened Steels in a Combined Tool for Hot and Cold Forming

Study of Transition Areas in Press-Hardened Steels in a Combined Tool for Hot and Cold Forming

Fatigue Behaviour of Tempered and Isothermal Heat Treated Aisi 5160 Leaf Spring Steel

Fatigue Performance of Laser Welds in Heavy-Gage Press Hardening Steels

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