Micro-Structural Characterization and Semi Quantitative Chemical Analysis of Ferrite and Austenite Phases in Duplex Stainless Steels

Vicente, André de Albuquerque; Botelho, Amilton Barbosa; Moreno, João Roberto Sartori; Santos, Tiago Felipe de Abreu; Espinosa, Denise Crocce Romano; Tenório, Jorge Alberto Soares

doi:10.2139/ssrn.3309760

Cited by 1 publication

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[26,27] Al 2 O 3 with NiAl 2 O 4 on either side was observed in IN713, congruous with the findings of the literature. [28,29] The magnitude of this depletion zone was highly alloy dependent. The observed c 0 depletion zone was largest in Waspaloy followed by ABD850AM.…”

Section: A Mass Gain and Growth Kineticsmentioning

confidence: 99%

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Utada

Pedraza

Dick-Cleland³

et al. 2022

Metall Mater Trans A

View full text Add to dashboard Cite

This body of work aims to inform alloy design for additive manufacturing by investigating the early-stage oxidation behavior of Ni-based superalloys processed by laser-powder bed fusion. The oxidation of 14 Ni-based superalloys—some novel and some heritage—at 1000 °C for 24 hours is studied through thermo-gravimetric analysis. The mass gain, oxide layer thickness, oxide scale composition, and $$\gamma ^\prime $$ γ ′ depletion zone size are measured. The influence of the alloy composition on these variables is assessed in order to elucidate how increasingly processable and oxidation resistant alloys can be developed. The alloy compositions with Al content greater than 9 at. pct form continuous Al2O3 scales at 1000 °C and display markedly lower parabolic rate constants, mass gain, oxide layer thickness, and $$\gamma ^\prime $$ γ ′ depletion zone size. The alloys of lesser Al content have reduced oxidation resistance and formed oxide scales of predominantly Cr2O3. Alloys with Ti content of 2.7 at. pct and greater formed Ti-rich oxide phases in their oxide scales as well as TiN subscale. A trade-off between alloy processability and oxidation resistance is identified, dictated by the deleterious effect of Al content on the ductility dip and the benefit of Al for oxidation resistance. A property space along the pareto front is highlighted which is ideal for having oxidation resistance and processability.

show abstract