The impact toughness and tensile properties of 8320 steel

Effect of temperature on impact properties and microstructural evolution of twinning induced plasticity steel

“…In the experimental temperature range, the impact absorbed energy of the austenitic TWIP steel is similar to that of the martensitic 7 and nickel free austenitic a 20uC; b 220uC; c 250uC; d 280uC; e 2110uC; f 2196uC 2 Fractographs of TWIP steels impacted at various temperatures stainless steel, 18 but much lower than that of the high nitrogen austenitic stainless 19 and 8320 steel, 20 and higher than the dual phase steels. 21 These results show that the impact toughness of metals is affected not only by the original microstructure but also by the microstructure transformation in the progress of impact.…”

“…Although the impact toughness of TWIP steel decreases with the decrease in tested temperature, the TWIP steel processes enough impact absorbed energy to satisfy the requirement at service temperatures ranging from 20 to −50°C. The impact absorbed energy of TWIP steel varies within a small range, which is 90 J from 20 to −196°C, much lower than the 290 J of the high nitrogen austenitic stainless19 and the 250 J of the 8320 steel 20. Additionally, the impact toughness of TWIP steel at an ambient temperature of −196°C is ∼ 50 J, higher than the low alloy high carbon,6 martensitic,7 nickel free austenitic18 and high nitrogen austenitic stainless steels,19 as well as the 832020 and dual phase steels 21.…”

“…However, the impact properties of metals cannot be confirmed through fractures. The niobium microalloyed,5 832020 and dual phase steels21 process better impact toughness than the low alloy, high carbon and high nitrogen austenitic stainless steels,19 although the fractures of the steels are of the same cleavage rupture type. The impact fractures of the TWIP steels exhibit cleavage rupture, but they still process better impact properties.…”

“…The impact absorbed energy of TWIP steel varies within a small range, which is 90 J from 20 to 2196uC, much lower than the 290 J of the high nitrogen austenitic stainless 19 and the 250 J of the 8320 steel. 20 Additionally, the impact toughness of TWIP steel at an ambient temperature of 2196uC is y 50 J, higher than the low alloy high carbon, 6 martensitic, 7 nickel free austenitic 18 and high nitrogen austenitic stainless steels, 19 as well as the 8320 20 and dual phase steels. 21 The impact toughness of TWIP steel may be less affected by temperature and higher at 2196uC.…”

The Tensile Response and Fracture Behavior of Four High Strength Specialty Steels

“…The elongated voids grow until coalescence occurs by mutual interaction or impingement by the mechanism of void‐sheet formation 27–31. Failure of the void sheet occurs in a manner that creates a rough fracture surface at the microscopic level comprising of segments oriented at angles to the far‐field or principal stress axis 32. Half of the void is the shallow dimples observed on the fracture surface.…”