Effects of solution heat treatment on the microstructure and hardness of Inconel 740 superalloy prepared by electron beam smelting

You, Xiaogang; Tan, Yi; Li, Jiayan; Li, Pengting; Chen, Dong; Shi, Shuang; Liao, Jiao; Qin, Shiqiang

doi:10.1016/j.jallcom.2015.03.075

Cited by 21 publications

(6 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The large black irregular phases are observed to be surrounded by rosette‐like (γ–γ′) eutectics in the interdendritic region, as shown in Figure 7c, indicating that the formation of the black irregular phase is closely related with (γ–γ′) eutectics. By analyzing the composition characteristic of the black irregular phase from the EDX spectrum, the black irregular phase is enriched in Ni, Co, Si, and Ti, which is consistent with the other studies, [ 22,23 ] herein, after referred to as the Ti(NiCo)Si phase. After quantitative metallographic analysis, the volume fraction of the Ti(NiCo)Si phase in Alloy 4 is about 7.1%, and the variation of that in alloy with different Si additions is shown in Figure .…”

Section: Resultssupporting

confidence: 88%

Effect of Si on the Solidification Segregation Behavior of a New Ni–Co‐Based Superalloy

et al. 2021

Self Cite

View full text Add to dashboard Cite

Herein, the effects of Si addition on the microstructure and solidification behavior of a new Ni–Co‐based superalloy are investigated. The microstructure of the as‐cast alloys is mainly composed of γ, γ′, (γ–γ′) eutectics, and MC‐type carbides. The results demonstrate that Si addition significantly decreases the size and volume fraction of (γ–γ′) eutectics, while promoting the formation of Si‐rich phase precipitated in front of the (γ–γ′) eutectics. The formation of a Si‐rich phase is induced by the rejection of Ti and Si into the residual liquid during the γ matrix formation. With the increase in Si content, the size distribution of (γ–γ′) eutectics decreases due to the formation of the Si‐rich phase consuming the forming element of (γ–γ′) eutectics. The solidus and liquidus temperatures of the alloy decrease with the increase in Si. However, the range of melting temperature increases. The Si addition promotes the segregation of alloying elements, and Si tends to segregate in the interdendritic region.

show abstract

Section: Resultssupporting

confidence: 88%

Effect of Si on the Solidification Segregation Behavior of a New Ni–Co‐Based Superalloy

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Zhang et al [29] found that the DRX behavior in a Ni-base superalloy is highly sensitive to strain rate in hot deformation. You et al [30] studied the effects of solution temperature on the microstructure and hardness of the electron beam smelted Inconel 740 superalloy. Lin et al [31] clarified that δ phase could accelerate the formation and rotation of subgrains of GH4169 superalloy.…”

Section: Introductionmentioning

confidence: 99%

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Wen

Lin

Zhou

2017

Vacuum

120

View full text Add to dashboard Cite

“…The raw materials for preparation of Inconel 740 were simple substances. The purity of each element and the smelting parameters were described in reference [2]. The chemical composition (wt.%) of the EBS 740 ingot is tested by the X-ray fluorescence (XRF) spectrometry.…”

Section: Materials and Heat Treatmentmentioning

confidence: 99%

“…The high temperature strength of 740 superalloy is F o r P e e r R e v i e w 2 provided by the substantial precipitation of γ`-Ni 3 (Al,Ti) phase and solid solution strengthening of Co, Cr, Fe, and Mo atoms. Besides, the formation of carbides such as TiC and Cr 23 C 6 can further strengthen the superalloy by retarding the grain boundary sliding [2,3]. Moreover, the Ti, Al and Cr elements could provide the good corrosion resistance by formation of the three distinct oxidation layers for 740 superalloy [4].…”

Section: Introductionmentioning

confidence: 99%

The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

You

Tan

et al. 2018

J. of Materi Eng and Perform

Self Cite

View full text Add to dashboard Cite

The Inconel 740 superalloy was prepared by the electron beam smelting (EBS) technology, the precipitation behavior and strengthening mechanism were studied, and the hot deformation characteristics of EBS 740 superalloy were investigated. The results indicate that the EBS 740 superalloy is mainly strengthened by the mechanism of weakly coupled dislocation shearing, and the resulting critical shear stress is calculated to be 234.6 MPa. The deformation parameters show a great influence on the flow behavior of EBS 740 superalloy. The strain rate sensitivity exponent increases with the increasing of deformation temperature, and the strain hardening exponent shows a decreasing trend with the increasing of strain. The activation energy of EBS 740 above 800 °C is measured to be 408.43 kJ/mol, which is higher than the 740H superalloy. A hyperbolic-sinetype relationship can be observed between the peak stress and Zener-Hollomon parameter. Nevertheless, the influence of deformation parameters is found to be considerably different at temperatures below and above 800 °C. The size of dynamic recrystallization (DRX) grains decreases with the increasing of strain rate when the strain rate is lower than 1/ s, and reverse law can be found at higher strain rate. As a result, a piecewise function is established between the DRX grain size and hot working parameters.Abstract: The Inconel 740 superalloy was prepared by the electron beam smelting (EBS) technology, the precipitation behavior and strengthening mechanism were studied, and the hot deformation characteristics of EBS 740 superalloy were investigated. The results indicate that the EBS 740 superalloy is mainly strengthened by the mechanism of weakly coupled dislocation (WCD) shearing, and the resulting critical shear stress is calculated to be 234.6 MPa. The deformation parameters show a great influence on the flow behavior of EBS 740 superalloy. The strain rate sensitivity exponent increases with the increasing of deformation temperature, and the strain hardening exponent shows a decreasing trend with the increasing of strain. The activation energy of EBS 740 above 800 °C is measured to be 408.43 kJ/mol, which is higher than the 740H superalloy. A hyperbolic-sine type relationship can be observed between the peak stress and Zener-Hollomon parameter. Nevertheless, the influence of deformation parameters is found to be considerably different at temperatures below and above 800 °C. The size of dynamic recrystallization (DRX) grains decreases with the increasing of strain rate when the strain rate is lower than 1/s, and reverse law can be found at higher strain rate. As a result, a piecewise function is established between the DRX grain size and hot working parameters.

show abstract

Effects of solution heat treatment on the microstructure and hardness of Inconel 740 superalloy prepared by electron beam smelting

Cited by 21 publications

References 35 publications

Effect of Si on the Solidification Segregation Behavior of a New Ni–Co‐Based Superalloy

Effect of Si on the Solidification Segregation Behavior of a New Ni–Co‐Based Superalloy

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

Contact Info

Product

Resources

About