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|Title:||Parameters of Load-Displacement Curves and Their Correlation with the Fracture Surface in Medium-Carbon Steel|
|Authors:||Khotinov, V. A.|
Ovsyannikov, A. B.
Andreev, A. A.
Farber, V. M.
|Publisher:||Institute for Metals Superplasticity Problems of Russian Academy of Sciences|
Institute for Metals Superplasticity Problems of RAS
|Citation:||Parameters of Load-Displacement Curves and Their Correlation with the Fracture Surface in Medium-Carbon Steel / V. A. Khotinov, A. B. Ovsyannikov, A. A. Andreev et al. // Letters on Materials. — 2021. — Vol. 11. — Iss. 4. — P. 514-518.|
|Abstract:||Impact tests are mandatory for a wide range of structural steel products to evaluate the required service life and operational safety. This test is especially relevant for products used in operation in climatic areas with a cold climate, since it allows one to determine the temperature range of the ductile-brittle transition. Depending on the structural-phase state of a metal, the type of the temperature relationship of impact toughness and its displacement on the temperature axis may differ significantly. For ductile materials, the temperature range of the ductile-brittle transition is shifted towards ultra-low negative temperatures whereas for materials in the embrittled condition it lies in the region of higher temperatures. Ductile-brittle transition behavior of medium-carbon steel with 0.32% C-1.35% Mn-0.003% B in two conditions (after normalization and after quenching and tempering) by instrumented impact testing and fracture analysis was studied. On the descending branch of the force-displacement curves the periods corresponding to different zones of propagation of the main crack are distinguished: period I is the ductile zone of pure shear, period II is the zone of brittle fracture, period III is the ductile zone of break fracture. Each period can be quantitatively described by a set of strength, plastic and gradient parameters. It is established that the displacement to the beginning of linear period II (SIIb ) and slope of the curve on it (ΔF/ΔS)II have a better correlation with shear fracture zone percentage (B) than the other distinguished parameters of force-displacement curves. © 2021, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.|
INSTRUMENTAL IMPACT TEST
SHEAR FRACTURE ZONE PERCENTAGE
STRUCTURAL MEDIUM-CARBON STEELS
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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