Design of duplex low-carbon steels with carbide forming elements

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The design of duplex ferrite-martensite (DFM) steels with carbide forming elements were investigated. The alloys Fe/0.14 C/1.45 Si/X (X being the substitutional alloying element of Mos or Nb) were selected. The DFM microstructures are controlled by the type of alloy element and the subsequent thermal treatment. The tensile properties of specimens subjected to either the intermediate quench (IQ) or the intermediate air cool (IAC) heat treatments have been correlated with their respective microstructures. Dispersion hardening as a secondary strengthening mechanism is found to limit the ductility and increasing the strength due to carbide precipitation in the ferrite. Unusual behavior in ... continued below

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Pages: 66

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Costello, P.K. December 1, 1978.

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Description

The design of duplex ferrite-martensite (DFM) steels with carbide forming elements were investigated. The alloys Fe/0.14 C/1.45 Si/X (X being the substitutional alloying element of Mos or Nb) were selected. The DFM microstructures are controlled by the type of alloy element and the subsequent thermal treatment. The tensile properties of specimens subjected to either the intermediate quench (IQ) or the intermediate air cool (IAC) heat treatments have been correlated with their respective microstructures. Dispersion hardening as a secondary strengthening mechanism is found to limit the ductility and increasing the strength due to carbide precipitation in the ferrite. Unusual behavior in the strength-law of mixtures relationship is observed. The differences in properties displayed by the alloys between the IG and IAC thermal treatments are primarily attributed to the connectivity of the martnesite particles. The IQ treatment provided strength and elongation ductility (i.e., total or uniform elongation to deformation) combinations which are superior to those of the IAC process. Specifically, the niobium steel displayed the best mechanical properties.

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Pages: 66

Notes

Dep. NTIS, PC A04/MF A01.

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  • Report No.: LBL-8628
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/6139840 | External Link
  • Office of Scientific & Technical Information Report Number: 6139840
  • Archival Resource Key: ark:/67531/metadc1111757

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 1, 1978

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

Description Last Updated

  • March 22, 2018, 7:27 p.m.

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Costello, P.K. Design of duplex low-carbon steels with carbide forming elements, report, December 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc1111757/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.