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Forming-Induced Residual Stress and Material Properties of Roll-Formed High-Strength Steels

Automotive Innovation 2020年第3期3卷 210-220页

作者： Yong Sun VladimirLuzin Yixin Duan Rameshkumar Varma Lei Shi Matthias Weiss Institute for Frontier Materials(IFM) Deakin UniversityGeelongVIC3216Australia School of Mechanical and Mining Engineering The University of QueenslandSt LuciaBrisbaneQLD 4072Australia Australian Nuclear Science and Technology Organization(ANSTO) Lucas HeightsNSW2234Australia School of Engineering The University of NewcastleCallaghanNSW2308Australia Research Institute Baoshan Iron&SteelCo.Ltd.Shanghai 201900China

Martensitic steels are widely used in the automotive lightweight application but less understood in aspects of post-forming material *** steels show good ductility in roll forming but occasionally experience delayed(hydrogen)fracture issues,which are believed to be due to the formation of localized residual stress and a reduced product of strength and *** characterize the effect of roll forming process on the formation of residual stress and material properties variation of martensitic steel components,this paper investigates the forming-induced longitudinal residual stress and material property variation in a roll-formed high-strength MS1180 automotive rocker *** finite element analysis results for residual stress are validated by neutron diffraction *** numerical model is used to analyze the full evolution of residual stress during the roll forming process and the effect on material properties with major focus on the product of strength and *** is found that the flower design,in particular the overbending stages,play a significant role in the formation of residual stress and the change in material *** product of strength and elongation is significantly reduced across the profile,in particular in the *** achieved understanding will assist researchers comprehend the material properties of roll-formed component and therefore assist future studies aimed at preventing the occurrence of hydrogen fracture.

关键词： Roll forming advancedhigh-strengthsteels Martensiticsteels Forming-inducedresidualstress Neutrondiffractionmethod Productofstrengthandelongation

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