Influence of small amount and different morphology of secondary phases on impact toughness of UNS S32205 Duplex Stainless Steel

Gennari, Claudio; Pezzato, Luca; Piva, Enrico; Gobbo, R.; Calliari, Irene

doi:10.1016/j.msea.2018.05.063

Cited by 46 publications

(24 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the key mechanical properties of steels employed in structural applications is impact toughness. However, impact toughness is not related only to the chemical composition of the metal but can be significantly modified by deformation route or/and heat treatments [6]. Among the different heat treatments, quenching and tempering are used extensively in the forging industry.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel

Pezzato

Gennari

Chukin

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

During the production of forged metal components, the sequence of heat treatments that are carried out, as well as hot working, remarkably influences mechanical properties of the product, in particular impact toughness. It is possible to tailor impact toughness by varying tempering temperature and soaking time after hardening treatment, widening the application range of structural steels. In this work, we consider the effects of a second tempering treatment on the microstructural properties and impact toughness of a structural steel EN 10025-6 S690 (DIN StE690, W. n: 1.8931). The steel was first forged and quenched in water after austenitization at 890 °C for 4 h. After quenching different tempering treatments were performed, at 590 °C in single or multiple steps. The effect of these treatments was evaluated both in microstructural terms, by means of optical microscopy, scanning and transmission electron microscopy and X-ray diffraction, and in terms of impact toughness. The mechanical behavior was correlated with the microstructure and a remarkable increase in impact toughness was found after the second tempering treatment due to carbide shape change.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel

Pezzato

Gennari

Chukin

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…[1][2][3]. Their mechanical and corrosion properties are higher compared to austenitic stainless steels, on the other hand they suffer from secondary phase precipitation which causes embrittlement, poor corrosion properties and limits their working temperature to 350 • C [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

et al. 2020

Self Cite

View full text Add to dashboard Cite

Prestrained at 5% and 15% duplex stainless steel UNS S32750 specimens have been subjected to electropulsing treatments with current density of 100 A/mm2 and 200 A/mm2 and 100 and 500 pulses for each current density value. Corrosion tests, X-ray diffraction, microhardness and residual stresses were collected before and after the electropulsing treatments. Tensile tests were performed after the electropulsing treatments in order to compare the mechanical response to reference tensile tests performed before pulsing treatments. Increase in fracture strain was observed after pulsing treatment in comparison to the reference tensile tests. A decrease in microhardness was also observed after electropulsing treatments for both degrees of prestrain. Electropulsing treatment almost eliminates the work-hardened state in the 5% prestrained specimens while partially recovered the 15% prestrained material increasing both uniform and fracture strain. Bulk temperature of the samples remained the same for all treatments duration. The effect are to be addressed to a combined effect of increase in atomic flux due to the electrical current and local joule heating in correspondence of crystal defects. Electropulsing treatment applied to metallic alloys is a promising technique to reduce the work hardening state without the need of annealing treatments in a dedicated furnace.

show abstract

“…From the point of the growth of η phase and the coarsening of γ ′ phase during aging, Zhao and Xie [11] analyze the formation process of brittle impact fracture of a new nickel-based superalloy. Claudio Gennaria et al [12] found that the precipitation of a small quantity of phases with different morphologies in UNS S32205 steel decreased the impact properties of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy

Huang

Qin

et al. 2020

Scanning

View full text Add to dashboard Cite

Microstructural evolutions of EK61 superalloy during long-term aging until 1000 h at 700°C and 750°C, respectively, are studied by combination of Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). Impact fracture morphologies after aging for different time are observed by the SEM. The microstructure is found to be relatively stable during aging at 700°C, and the fracture morphologies are characterized by transgranular fracture. At 750°C, the coarsening of γ′ phase leads the reduction of the quantity of dimples, the chainization of carbides on grain boundaries leads to intergranular fracture, and the netting of η phases within grains leads to the formation of lamellar cleavage steps. It is obvious that the destabilization of precipitated phases affects fracture morphology significantly. The relationship between fracture morphology and the microstructure promotes the evaluation of service reliability of EK61 superalloy.

show abstract

Influence of small amount and different morphology of secondary phases on impact toughness of UNS S32205 Duplex Stainless Steel

Cited by 46 publications

References 12 publications

Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel

Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy

Contact Info

Product

Resources

About