Abstract Hydrogen embrittlement (HE) of advanced high-strength steels is a crucial problem in the automotive industry, which may cause time-delayed failure car body components. Practical approaches for evaluating HE risk are often partially and contradictive nature, because hydrogen desorption during testing inhomogenous distributions in, e.g., notched samples. Therefore, present work aims to p...

Dual-phase (DP) steels are widely used in sheet metal stamping. However, they typically characterized by low hole expansion ratios. Since flanging is very often applied to parts, solutions for improving flangeability needed. In this study, high-speed punch rotation of DP 1000 generate frictional heat and increase formability. The flanges were formed using a rotating at 8000 rev/min varying axia...

effect of small al additions, from 0.14% to 0.31% ai, on the hot deformation behavior of low carbon steels containing 1%cu-1.2%mn was investigated in the temperature range of 750-800•c over the strain rate range of 1o.3.1o.1s•1 by a hot compression testing machine. the flow curves obtained, exhibited typical characteristics of dynamic recovery type of softening mechanism, and the critical strai...

A previous constitutive modeling for single-phase steels is extended using the mixing law to predict behavior of hot deformation in dual phase ferritic-austenitic intercritical zone Fe-C-Mn-Si alloys. Mixing considers two phases instead one, so one formula was modified. The constant’s values used represents average same conditions austenitic and ferritic model. amount each determined as functio...

To clarify the contribution of martensite increase to work-hardening during transformation-induced plasticity (TRIP), changes in local strain distribution with tensile deformation were investigated for dual-phase steels different volume fractions ferrite using precise marker method. Particular attention was paid and stress bearing by deformation. The method is especially useful analysis multiph...