Thermo-Mechanical Processing and Properties of a Ductile Iron
Abstract
Thermo-mechanical processing of ductile irons is a potential method for enhancing their mechanical properties. A ductile cast iron containing 3.6% C, 2.6% Si and 0.045% Mg was continuously hot-and-warm rolled or one-step press-forged from a temperature in the austenite range (900{degrees}C-1100{degrees}C) to a temperature below the A, temperature. Various amounts of reduction were used (from 60% to more than 90%) followed by a short heat ent at 600`C. The heat ent lead to a structure of fine graphite in a matrix of ferrite and carbides. The hot-and- warm worked materials developed a pearlitic microstructure while the press-forged material developed a spheroidite-like carbide microstructure in the matrix. Cementite-denuded ferrite zones were developed around graphite stringers in the hot-and-warm worked materials, but such zones were absent in the press-forged material. Tensile properties including tensile strength and total elongation were measured along the direction parallel and transverse to the rolling direction and along the direction transverse to the press-forging direction. The tensile ductility and strength both increased with a decrease in the amount of hot-and-warm working. The press- forged materials showed higher strength (645 MPa) than the hot-and-warrn worked materials (575 MPa) when compared at the same ductility level (22% elongation).
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Research, Washington, DC (United States)
- OSTI Identifier:
- 358868
- Report Number(s):
- UCRL-JC-128056; CONF-970980-
ON: DE98050956
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Conference
- Resource Relation:
- Conference: Materials Week `97, Indianapolis, IN (United States), 14-18 Sep 1997; Other Information: PBD: 14 Jul 1997
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; IRON; DUCTILITY; THERMOMECHANICAL TREATMENTS; METALLOGRAPHY; MICROSTRUCTURE; TENSILE PROPERTIES; CEMENTITE
Citation Formats
Syn, C K, Lesuer, R R, and Sherby, O D. Thermo-Mechanical Processing and Properties of a Ductile Iron. United States: N. p., 1997.
Web.
Syn, C K, Lesuer, R R, & Sherby, O D. Thermo-Mechanical Processing and Properties of a Ductile Iron. United States.
Syn, C K, Lesuer, R R, and Sherby, O D. 1997.
"Thermo-Mechanical Processing and Properties of a Ductile Iron". United States. https://www.osti.gov/servlets/purl/358868.
@article{osti_358868,
title = {Thermo-Mechanical Processing and Properties of a Ductile Iron},
author = {Syn, C K and Lesuer, R R and Sherby, O D},
abstractNote = {Thermo-mechanical processing of ductile irons is a potential method for enhancing their mechanical properties. A ductile cast iron containing 3.6% C, 2.6% Si and 0.045% Mg was continuously hot-and-warm rolled or one-step press-forged from a temperature in the austenite range (900{degrees}C-1100{degrees}C) to a temperature below the A, temperature. Various amounts of reduction were used (from 60% to more than 90%) followed by a short heat ent at 600`C. The heat ent lead to a structure of fine graphite in a matrix of ferrite and carbides. The hot-and- warm worked materials developed a pearlitic microstructure while the press-forged material developed a spheroidite-like carbide microstructure in the matrix. Cementite-denuded ferrite zones were developed around graphite stringers in the hot-and-warm worked materials, but such zones were absent in the press-forged material. Tensile properties including tensile strength and total elongation were measured along the direction parallel and transverse to the rolling direction and along the direction transverse to the press-forging direction. The tensile ductility and strength both increased with a decrease in the amount of hot-and-warm working. The press- forged materials showed higher strength (645 MPa) than the hot-and-warrn worked materials (575 MPa) when compared at the same ductility level (22% elongation).},
doi = {},
url = {https://www.osti.gov/biblio/358868},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 14 00:00:00 EDT 1997},
month = {Mon Jul 14 00:00:00 EDT 1997}
}