MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL
Abstract
Adiabatic shear bands, obtained in compression deformation at a strain rate of 4000 s{sup -1}, in a pearlitic 1.3%C steel, were investigated. Shear-bands initiated at 55% compression deformation with the width of the band equal to 14 {micro}m. Nano-indentor hardness of the shear band was 11.5 GPa in contrast to the initial matrix hardness of 3.5 GPa. The high strength of the shear band is attributed to its creation from two sequential events. First, large strain deformation, at a high strain rate, accompanied by adiabatic heating, led to phase transformation to austenite. Second, retransformation upon rapid cooling occurred by a divorced eutectoid transformation. The result is a predicted microstructure consisting of nano-size carbide particles within a matrix of fine ferrite grains. It is proposed that the divorced eutectoid transformation occurs in iron-carbon steels during high rate deformation in ball milling, ball drop tests and in commercial wire drawing.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 891730
- Report Number(s):
- UCRL-JRNL-200196
TRN: US200622%%335
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Journal Article
- Journal Name:
- Materials Science and Technology, vol. 21, no. 3, March 1, 2005, pp. 317-324
- Additional Journal Information:
- Journal Name: Materials Science and Technology, vol. 21, no. 3, March 1, 2005, pp. 317-324
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; AUSTENITE; CARBIDES; CARBON STEELS; COMPRESSION; DEFORMATION; EUTECTOIDS; FERRITE; HARDNESS; HEATING; MICROSTRUCTURE; MILLING; PHASE TRANSFORMATIONS; SHEAR; STEELS; STRAIN RATE; TRANSFORMATIONS
Citation Formats
Syn, C K, Lesuer, D R, and Sherby, O D. MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL. United States: N. p., 2003.
Web.
Syn, C K, Lesuer, D R, & Sherby, O D. MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL. United States.
Syn, C K, Lesuer, D R, and Sherby, O D. 2003.
"MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL". United States. https://www.osti.gov/servlets/purl/891730.
@article{osti_891730,
title = {MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL},
author = {Syn, C K and Lesuer, D R and Sherby, O D},
abstractNote = {Adiabatic shear bands, obtained in compression deformation at a strain rate of 4000 s{sup -1}, in a pearlitic 1.3%C steel, were investigated. Shear-bands initiated at 55% compression deformation with the width of the band equal to 14 {micro}m. Nano-indentor hardness of the shear band was 11.5 GPa in contrast to the initial matrix hardness of 3.5 GPa. The high strength of the shear band is attributed to its creation from two sequential events. First, large strain deformation, at a high strain rate, accompanied by adiabatic heating, led to phase transformation to austenite. Second, retransformation upon rapid cooling occurred by a divorced eutectoid transformation. The result is a predicted microstructure consisting of nano-size carbide particles within a matrix of fine ferrite grains. It is proposed that the divorced eutectoid transformation occurs in iron-carbon steels during high rate deformation in ball milling, ball drop tests and in commercial wire drawing.},
doi = {},
url = {https://www.osti.gov/biblio/891730},
journal = {Materials Science and Technology, vol. 21, no. 3, March 1, 2005, pp. 317-324},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 22 00:00:00 EDT 2003},
month = {Mon Sep 22 00:00:00 EDT 2003}
}