Tensile properties of a thermomechanically processed ductile iron

Journal Article · Thu May 01 04:00:00 EDT 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0286-0· OSTI ID:509180

Syn, C K; Lesuer, D R ^[1]; Sherby, O D ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Stanford Univ., CA (United States). Dept. of Materials Science and Engineering

A ductile cast iron was continuously hot-and-warm-rolled or one-step-forged from a temperature in the austenite range (900 C to 1,100 C) to a temperature below the A{sub 1} temperature. Various amounts of reduction were used (from 60 to more than 90 pct). Tensile properties including tensile strength and total elongation were measured along the directions parallel and transverse to the rolling direction and along the direction transverse to the forging direction. The tensile ductility and strength both increase with a decrease in the amount of hot-and-warm working (HWW). Compared with the results obtained by other investigators, the present results showed higher strengths and ductilities over the same range of reduction in thickness. The improvement in properties is related to the lower temperature of the postprocessing heat treatment given in this study (600 C) compared to other studies (900 C). The low temperature of heat treatment leads to a structure of fine graphite in a matrix of ferrite and carbides, whereas the high temperature of heat treatment leads to coarse graphite in a matrix of carbide-free ferrite. The delay in failure from the presence of the small graphite constituent results in an increase in tensile ductility with an accompanying increase in tensile strength.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 509180
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 5 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
DUCTILITY
ELONGATION
FERRITE
GRAPHITE
HEAT TREATMENTS
IRON
IRON CARBIDES
TENSILE PROPERTIES
THERMOMECHANICAL TREATMENTS