Effect of Trace Strontium Addition on Microstructure and Room Temperature Fracture Toughness of Nb-12Si-22Ti Alloys

Wu, Meng; Guo, Feng; Li, Ming; Han, Ya Fang

doi:10.4028/www.scientific.net/msf.849.603

Cited by 14 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As presented in Fig. 4(c), the final matrix microstructure consists of P with fine laths and a small fraction of granular ferrite (α) formed around the graphite, possibly resulting from the carbon deficit surrounding the graphite precipitates [11][12][13]. No bainite or austenite structures are observed in the final matrix microstructure.…”

Section: Microstructure Evolution During Directional Solidificationmentioning

confidence: 99%

Microstructure evolution in grey cast iron during directional solidification

Ding

Feng

et al. 2017

Int J Miner Metall Mater

View full text Add to dashboard Cite

Abstract:The solidification characteristics and microstructure evolution in grey cast iron were investigated through Jmat-Pro simulations and quenching performed during directional solidification. The phase transition sequence of grey cast iron was determined as L → L + γ → L + γ + G → γ + G → P (α + Fe 3 C) + α + G. The graphite can be formed in three ways: directly nucleated from liquid through the eutectic reaction (L → γ + G), independently precipitated from the oversaturated γ phase (γ → γ + G), and produced via the eutectoid transformation (γ → G + α). The area fraction and length of graphite as well as the primary dendrite spacing decrease with increasing cooling rate. Type-A graphite is formed at a low cooling rate, whereas a high cooling rate results in the precipitation of type-D graphite. After analyzing the graphite precipitation in the as-cast and transition regions separately solidified with and without inoculation, we concluded that, induced by the inoculant addition, the location of graphite precipitation changes from mainly the γ interdendritic region to the entire γ matrix. It suggests that inoculation mainly acts on graphite precipitation in the γ matrix, not in the liquid or at the solid-liquid front.

show abstract

Section: Microstructure Evolution During Directional Solidificationmentioning

confidence: 99%

Microstructure evolution in grey cast iron during directional solidification

Ding

Feng

et al. 2017

Int J Miner Metall Mater

View full text Add to dashboard Cite

show abstract

“…Alloying is one critical method to improve the mechanical properties of Nb-Si based alloy [5][6]. The previous studies were focused on the macro alloying such as Hf, Zr, Mg, Zn and so on [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Trace Ce and B Additions on the Mechanical Properties of Nb-3Si-22Ti Alloys

Guo

et al. 2017

MSF

Self Cite

View full text Add to dashboard Cite

The Nb-Si system ultrahigh temperature alloys were prepared by vacuum non-consumable arc melting. The influence of micro-alloying elements of B and Ce on the hardness, room-temperature fracture toughness and compressive strength at 1250°C of the Nb-22Ti-3Si alloys was investigated and estimated systematically. The results showed that the hardness of the Nb-22Ti-3Si alloy increased obviously with trace B addition, but decreased slightly with trace Ce addition. The room-temperature fracture toughness of the Nb-22Ti-3Si alloy was degraded by the Ce addition but improved by the trace addition of B. The trace addition of B improved the compressive strength of the alloy at 1250°C. In contrast, the trace Ce addition degraded the compressive strength at 1250°C. The relationship between the microstructure and the mechanical properties was discussed.

show abstract

“…The new generation of high thrust aero-engines lead to ever increasing demands on materials [1,2]. SiC fiber reinforced nickel-based superalloys shows great potential for meeting these requirements owing to its promising properties such as low density, high elevated temperature strength and excellent oxidation resistance [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Y<sub>2</sub>O<sub>3</sub> Coating on the Interface and Mechanical Properties of SiC Fiber Reinforced GH4738 Composites

Zhang

2017

MSF

View full text Add to dashboard Cite

To prevent the strong interfacial reactions in SiC fiber reinforced nickel-based superalloys matrix composites, yttrium oxide (Y2O3) was used as the barrier coating by reaction magnetron sputtering method. Compared with the composites without coating, after the high temperature hot isostatic pressing (HIP), Y2O3 coating effectively protected the SiC fibers from the interfacial reactions, and no element diffusion can be observed between the fibers and the matrix. The elevated temperature tensile tests were performed on both SiC/GH4738 and SiC/Y2O3/GH4738 composite. The results indicated that the strength of the composites with Y2O3 coating can increase about 35% in comparison with the composites without coating.

show abstract

Effect of Trace Strontium Addition on Microstructure and Room Temperature Fracture Toughness of Nb-12Si-22Ti Alloys

Cited by 14 publications

References 4 publications

Microstructure evolution in grey cast iron during directional solidification

Microstructure evolution in grey cast iron during directional solidification

Effect of Trace Ce and B Additions on the Mechanical Properties of Nb-3Si-22Ti Alloys

Effect of Y<sub>2</sub>O<sub>3</sub> Coating on the Interface and Mechanical Properties of SiC Fiber Reinforced GH4738 Composites

Contact Info

Product

Resources

About