Evaluation of the mechanical properties and corrosion behaviour of ultra-clean steels

Experimental investigation on possible dependence of plastic zone size on specimen geometry

“…The estimated 2% yield strength, ultimate tensile strength and percentage of elongation of the investigated steels as indicated in Tab. 2 are in close agreement with some earlier reported results [15,16] for IF steel. The true stress (σ) -true strain (ε) curve for the investigated material up to a maximum load is shown in Fig.2, which is used for elastic-plastic FE analysis.…”

Mechanical Properties of Ultra Clean Low C/Cr Stabilized Annealed Sheets

“…The coils annealed at 800 o C have a higher average Lankford value than the coils batch annealed a 670 ºC, and than the coils that were annealed continuously at 700 ºC and 750 ºC. The average Lankford value of the Ti stabilized steel annealed at 800 ºC is also smaller [18]. Regarding the batch annealed coils, their properties and ( r ) values are comparable to the values for the Ti/stabilized steel, but inferior than the Cr-stabilized steel annealed continuously at 800 o C. Takechi [4] pointed out that cold-rolled sheet steels are classified in four quality grades depending on their average Lankford value ( r ) and total elongation.…”

“…In all cases two stages are observed. For ULC steels stabilized with Ti [18] the annealing process also proceeds in two defined stages. The first stage corresponds to the early stages of the annealing process.…”

“…The mechanical properties of the Cr stabilized steel in the anneal condition are summarized in Table 1, including the target properties and the properties of an ULC Ti-stabilized steel [18]. From the tensile test results of the samples that were measured at 0 o , 45 o and 90 o from the rolling direction, the average Lankford value ( r ) was determined.…”

Analysis of the sensitivity of FEM predictions to numerical parameters in deep drawing simulations

“…The ODFTAY procedure is a little less accurate for the computation of the Lankford coefficients. As the Lankford coefficient is an important factor in deep drawing processes (as explained by Mendoza et al, 2000;Chung et al, 1996), the ODFLAM procedure should be preferred here. The superiority of the ODFLAM procedure is also shown in different applications in Duchêne (2003).…”