Thermo-Mechanical Processing and Properties of a Ductile Iron

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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 ... continued below

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12 p.; Other: FDE: PDF; PL:

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Syn, C.K.; Lesuer, R.R. & Sherby, O.D. July 14, 1997.

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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).

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12 p.; Other: FDE: PDF; PL:

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OSTI as DE98050956

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  • Materials Week `97, Indianapolis, IN (United States), 14-18 Sep 1997

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  • Other: DE98050956
  • Report No.: UCRL-JC--128056
  • Report No.: CONF-970980--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 358868
  • Archival Resource Key: ark:/67531/metadc679267

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  • July 14, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 17, 2016, 7:20 p.m.

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Syn, C.K.; Lesuer, R.R. & Sherby, O.D. Thermo-Mechanical Processing and Properties of a Ductile Iron, article, July 14, 1997; California. (digital.library.unt.edu/ark:/67531/metadc679267/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.