Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and α-iron

Published

April 15, 2007

Author(s)

Sudook A. Kim, Ward L. Johnson

Abstract

The elastic constants and internal friction of induction hardened and unhardened SAE 1050 plain-carbon steel were determined by acoustic resonance spectroscopy. The hardened specimen contained only martensite and the unhardened specimen was ferrite-pearlite. Using an inverse Ritz algorithm under the assumption of orthorhombic symmetry, all nine independent elements of the elastic-stiffness tensor were determined, and from the resonant peak widths, all nine elements of the internal friction tensor were determined. Similar measurements and analysis on monocrystalline α-iron were performed. The steel was found to be only slightly anisotropic, and the isotropically approximated elastic constants were lower in the martensite than in ferrite-pearlite: shear modulus by 4 %, bulk modulus by 1 %, Young modulus by 3 %, and Poisson ratio by 1.5 %. Isotropically approximated elastic constants and Poisson ratio of ferrite-pearlite and α-iron were similar. All elements of the internal friction tensor in martensite were higher than those of ferrite-pearlite, but lower than those of α-iron.

Citation

Mater. Sci. Eng. A

Volume

452-453

Pub Type

Journals

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Local Download

Citation

Kim, S. and Johnson, W. (2007), Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and α-iron, Mater. Sci. Eng. A, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50255 (Accessed October 10, 2025)