Enhanced hardenability and tempering resistance of AISI 4130 steel by Ni addition

G. M. Martínez-Cazares, A. Almanza, E. Almanza, D. E. Lozano

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The AISI 4130 steel grade is commonly used in piping systems, where optimum chemical composition and heat treatment can exhibit high yield strength, good ductility, and moderate weldability depending on composition. However, this steel grade is characterized by its low hardenability, which limits a good transformation during quenching in heavy sections. In order to improve hardenability, Ni was added and C was reduced for the same level of CE (0.7). Two chemical compositions were used; samples were quenched at critical cooling rate and tempered. With the addition up to 0.5 wt. % Ni, the alloy exhibited great improvement on strength and toughness; additionally, the alloy allowed an increase of 40°C on the tempering temperature for the same strength level. In the case of post-welding, heat treatment is required so that the alloy is less susceptible to suffering a drop in mechanical properties. Results of chemical composition, strength, and toughness are discussed.

Original languageEnglish
Pages (from-to)202-208
Number of pages7
JournalMaterials Performance and Characterization
Volume5
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

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Steel
Tempering
Chemical analysis
Toughness
Heat treatment
Weldability
Piping systems
Yield stress
Ductility
Quenching
Welding
Cooling
Mechanical properties
Temperature

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Polymers and Plastics
  • Metals and Alloys

Cite this

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abstract = "The AISI 4130 steel grade is commonly used in piping systems, where optimum chemical composition and heat treatment can exhibit high yield strength, good ductility, and moderate weldability depending on composition. However, this steel grade is characterized by its low hardenability, which limits a good transformation during quenching in heavy sections. In order to improve hardenability, Ni was added and C was reduced for the same level of CE (0.7). Two chemical compositions were used; samples were quenched at critical cooling rate and tempered. With the addition up to 0.5 wt. {\%} Ni, the alloy exhibited great improvement on strength and toughness; additionally, the alloy allowed an increase of 40°C on the tempering temperature for the same strength level. In the case of post-welding, heat treatment is required so that the alloy is less susceptible to suffering a drop in mechanical properties. Results of chemical composition, strength, and toughness are discussed.",
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Enhanced hardenability and tempering resistance of AISI 4130 steel by Ni addition. / Martínez-Cazares, G. M.; Almanza, A.; Almanza, E.; Lozano, D. E.

In: Materials Performance and Characterization, Vol. 5, No. 1, 01.01.2016, p. 202-208.

Research output: Contribution to journalArticle

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