Reducing Microsegregation in Next-Generation High-Strength Low-Alloy Cast Steels

Paul C. Lynch, Tyler J. Grimm

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The next generation of high-strength low-alloy (HSLA) cast steels is characterized by high levels of strength, as well as increased levels of ductility and impact toughness. The steels discussed in this paper are 4330, Eglin steel, and AF 9628 steel. Microsegregation of alloying elements within these materials, which is the tendency for a higher concentration of alloys to accumulate between dendrite arms, is commonly realized during the cooling stages of casting and can result in substandard mechanical properties. Since this next generation of HSLA cast steels is being utilized for critical commercial and military applications requiring both high levels of strength and ductility, methods of reducing microsegregation through proper heat treatment must be examined. Current methods of reducing microsegregation after casting primarily rely on vacancy diffusion. This effect is typically accelerated through heat treatments of the cast material. Herein, diffusion models are utilized to create a model capable of predicting microsegregation reduction in these high-strength low-alloy cast steels. This model was used to simulate high-temperature heat treatments in order to determine appropriate process parameters for microsegregation reduction of carbide-forming alloying elements in the next generation of high-strength low-alloy cast steels.

Original languageEnglish (US)
Pages (from-to)783-792
Number of pages10
JournalInternational Journal of Metalcasting
Volume13
Issue number4
DOIs
StatePublished - Oct 1 2019

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Steel
Heat treatment
Alloying elements
Ductility
Casting
Dendrites (metallography)
Military applications
Vacancies
Carbides
Fracture toughness
Cooling
Mechanical properties

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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Reducing Microsegregation in Next-Generation High-Strength Low-Alloy Cast Steels. / Lynch, Paul C.; Grimm, Tyler J.

In: International Journal of Metalcasting, Vol. 13, No. 4, 01.10.2019, p. 783-792.

Research output: Contribution to journalArticle

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