Influence of Nickel on the Fracture Behaviour of Fe-0.2c Alloy

Srinivas, M.; Malakondaiah, G.; Rao, P. Rama

doi:10.1007/978-94-011-3650-1_14

Cited by 1 publication

(1 citation statement)

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“…[2,[6][7][8] So far as toughness is concerned, Ni is considered as the primary alloying element in almost all the naval steels as it imparts excellent low-temperature toughness even under impact (high-strain-rate) loading conditions. [2,[9][10][11][12][13] Ni increases the low-temperature toughness of steel not only by enhancing the intrinsic fracture resistance of tempered martensite matrix but also by stabilizing the austenite phase. [10,14,15] Both the thermal and mechanical stability of austenite (γ), retained in a tempered martensite matrix (α), are equally important to ensure good impact toughness, particularly for low-temperature applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Austenite Reversion and Its Stability on the Tensile and Impact Transition Behavior of High‐Strength Naval Steel

Biswal,

Sk,

Barik

et al. 2023

steel research int.

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The present investigation correlates the austenite reversion and its stability during intercritical annealing (IA) with the tensile and Charpy impact properties of a low‐C naval grade steel. The as‐received steel is subjected to water quenching after austenitization at 950 °C, followed by IA at 620, 650, and 680 °C for 2 h. DICTRA simulation is used to predict the austenite reversion kinetics during the IA. Incorporation of cementite phase in the simulation correlates well with the experimental dilatometry results on the austenite growth kinetics. DICTRA simulation predicts a continuous rise in the reverted austenite fraction with increasing IA temperature. However, the percentage of reverted austenite, that gets retained after the subsequent quenching, decreases with increasing annealing temperature due to the reduction of austenite stability at elevated IA temperature. In other words, the amount of fresh untempered martensite increases rapidly with increasing IA temperature. Consequently, the sample annealed at an intermediate temperature of 650 °C (IA650) shows the best combination of strength, elongation, and low‐temperature impact properties as compared to the IA620 and IA680 steels due to an optimum balance of mechanically stable austenite and relatively lower untempered martensite fractions.

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