On the microstructural and mechanical characterizations of a low carbon and micro-alloyed steel

Investigation on the ballistic performance of a dual phase steel against 7.62mm AP projectile

“…It can be seen that in the intercritically heattreated samples, soft ferrite (light areas) and hard martensite (dark areas) phases occurred together and, as expected, the martensite volume fraction increased with the intercritical temperature. The initial martensite volume fractions were found to be 34%, 54% and 72% for LM, MM and HM, respectively, which were consistent with the values found in the previous study [16]. The volume fraction of retained austenite was detected to be 11%, 13% and 9%, in these respective samples, and the rest of the microstructure was the ferrite phase.…”

“…The intercritical heat treatments at three different temperatures (737 • C, 754 • C and 779 • C) were performed to attain various martensitic volume fractions in the samples. These temperatures were directly chosen from the previous study [16] to get low, medium and high martensite volume fractions (approximately 30%, 50% and 75%) in the steel. Also, the annealing treatment was applied to one steel specimen group for comparison with the dual phase.…”

“…Therefore, these two phases provide a good combination of ductility and strength. There have been a number of studies performed to determine the mechanical properties of dual phase steels with various chemical compositions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. However, the ballistic impact behavior of armor piercing (AP) projectiles on the high strain rate deformation characteristics of dual phase steels has not been investigated with except for a few studies [17,18].…”

“…Its mechanical characterization after various heat treatments, namely, intercritical heat treatment, annealing, normalizing and fully martensitic transformation, was carried out in a previous study [16]. In this work, the effects of martensite volume fraction and thickness of the steel on its ballistic resistance were investigated.…”

Microstructure based prediction of strain hardening behavior of dual phase steels

“…The DP steels with higher MPF showed higher strengths up to an ultimate tensile strength of 1000 MPa, but the elongation was low because of high MPF. Topcu and Uebeyli [28] reported the similar results that a significant reduction in the ductility of DP steel occurred due to the increase in the MPF. The DP steel annealed at 770°C with the MPF of 35% exhibited similar tensile strength, but lower uniform elongation than the DP800 steel.…”