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Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub Size and Miniaturized Charpy Specimens

Published

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

Abstract

In this investigation, we performed instrumented Charpy tests in order to characterize the impact properties of three steels, used by NIST for the production of Charpy reference specimens (4340 quenched and tempered with two energy levels, and T200 18Ni maraging steel). For each of the steels, tests were performed on standard E23 Charpy specimens, sub-size specimens of three types (3/4-size, 1/2 size and 1/4-size), and miniaturized specimens of RHS (Reduced Half-Size) geometry. For every combination of steel and specimen type, full transition curves and corresponding transition temperatures were established for absorbed energy, lateral expansion and shear fracture appearance.
Citation
Technical Note (NIST TN) - 1858
Report Number
1858

Keywords

ASTM A370, Charpy acceptance criteria, ductile-to-brittle transition temperature, instrumented Charpy tests, miniaturized Charpy specimens, NIST reference steels, size-normalization, sub- size Charpy specimens, shear fracture appearance, upper shelf energy.

Citation

Lucon, E. , McCowan, C. and Santoyo, R. (2015), Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub Size and Miniaturized Charpy Specimens, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.TN.1858 (Accessed April 14, 2024)
Created February 10, 2015, Updated November 10, 2018