Microstructure, plastic flow and fracture behavior of ferrite-austenite duplex low density medium Mn steel

The Influence of Microstructure on the Mechanical Properties and Fracture Behavior of Medium Mn Steels at Different Strain Rates

“…Void nucleation sites at the interface of γ(α )/α resulted from the strain gradients. The propagation of cracks was observed both within the δ-ferrite and along the δ/α+γ interface parallel to the rolling direction (RD), which is consistent with the analysis by Tonizzo et al [24]. Although Sun et al [25] reported the same void nucleation sites, cracks propagated preferentially into the brittle δ-ferrite perpendicular to the RD in both hot and cold rolled 3Si samples.…”

“…Apparently, the TRIP effects and mechanical properties are not yet clear. Second, although fracture behavior has been studied by some researchers [23][24][25], the influence of strain rate on fracture behavior in medium Mn steels has not been mentioned. However, the influence of strain rate on fracture behavior has been investigated in TRIP and dual phase (DP) steels [28,29].…”

Optimization of Anticorrosive Zinc Coatings: Tuning the Adhesion of Zinc/Silica Contact by Interfacial Ternary Oxide Formation

“…Routinely, before applying the zinc coating, coldrolled steel strips undergo a recrystallisation annealing to remove stresses and residual iron oxides 1,2 . Since the novel, advanced high strength steels (AHSS) are purposely enriched in strengthening elements, such as Al, Si and Mn [3][4][5][6][7][8][9] , the annealing results in a selective oxidation of the electropositive alloyed elements. Segregation of the corresponding oxides at the steel surface reduces dramatically the adhesion of the anti-corrosive zinc protection 2,5 .…”

“…For example, the improvement of adhesion between large gap oxides (such as silica or alumina) and late transition metals (such as zinc) appears nowadays as a key challenge for the optimization of anticorrosive zinc coatings of modern steel grades, which are of crucial importance in the steel-making and automotive industries. Routinely, before applying the zinc coating, cold-rolled steel strips undergo a recrystallization annealing to remove stresses and residual iron oxides. , Since the novel advanced high strength steels (AHSS) are purposely enriched in strengthening elements, such as Al, Si, and Mn, − the annealing results in a selective oxidation of the electropositive alloyed elements. Segregation of the corresponding oxides at the steel surface dramatically reduces the adhesion of the anticorrosive zinc protection. , …”

Effects of surface hydroxylation on adhesion at zinc/silica interfaces

“…Galvanic zinc protection of iron-based materials has long proved its efficiency since zinc sacrificially corrodes to protect steel. 1 However, with the advent of advanced high strength steels (AHSS), [2][3][4][5][6][7] the optimization of anti-corrosive galvanic zinc coatings faces new challenges. Indeed, the recrystallization annealing of AHSS strips in a reducing atmosphere provokes a selective oxidation of light strengthening elements (Al, Si, and Mn) and the segregation of their oxides to the steel surfaces, which dramatically reduces the zinc adhesion.…”