The Microstructure of RR1000 Nickel-Base Superalloy: The FIB-SEM Dual-Beam Approach

Croxall, S A; Hardy, Mark; Stone, Howard J.; Midgley, Paul A.

doi:10.1007/978-3-319-48762-5_33

Cited by 5 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The test material used in this research was fine grain RR1000, a Ni-based alloy, developed by Rolls-Royce plc. using powder metallurgy process, which is used predominantly for turbine discs [7,10]. RR1000 is comprised of high volume of primary ' precipitates with a finely distributed carbides and serrated grain boundaries [7].…”

Section: Experimental Methodologymentioning

confidence: 99%

See 1 more Smart Citation

Microstructure Study of Nickel-Based Superalloys after Deep Cold Rolling

Castagne

2016

MSF

View full text Add to dashboard Cite

Mechanical surface treatments are conducted on aerospace components in order to improve their fatigue life through inducing compressive residual stresses, cold work and smoother surface finish. The microstructures of the component surface and subsurface after treatment influence the crack nucleation and crack propagation significantly. This paper studies the effect of Deep Cold Rolling (DCR), a subsurface process using hydrostatically controlled balls, on the resulting microstructure of RR1000, a nickel-based superalloy used in high temperature aerospace applications. In this study, DCR of RR1000 was conducted by varying the diameter of the roller ball with a constant fluid pressure and overlap. Vickers microhardness was measured to characterize the work hardening behavior during DCR. The microstructure of RR1000 subsurface before and after DCR along both the rolling and transverse directions is analyzed further. The results show that deep cold rolling results in a significant variation on the microstructure of RR1000 including elongation of matrix grains and the precipitates, within a depth of 10 μm from the rolling surface. The change in microstructure along the rolling surface is found to be more prominent than along the transverse directions irrespective of the ball diameter.

show abstract

Section: Experimental Methodologymentioning

confidence: 99%

“…Table 1. Chemical composition of RR1000 [10] Measurements. The rolled samples were first wire-cut in order to examine the cross-section along the rolling and transverse directions.…”

Section: Experimental Methodologymentioning

confidence: 99%

Microstructure Study of Nickel-Based Superalloys after Deep Cold Rolling

Castagne

2016

MSF

View full text Add to dashboard Cite

show abstract

“…Overview of common commercial cast and wrought Ni-based superalloys. [12,[172][173][174] Contents of major alloying elements are comparable, differences are dominated by C, B, and others.…”

Section: Solid-state Microsegregationmentioning

confidence: 96%

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

View full text Add to dashboard Cite

Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni3(Al,Ti) γ′ precipitates, carbides (MC, M6C, and M23C6), borides (M2B, M3B2, and M5B3), and other inclusions. Microalloying additions of B, C, and Zr commonly improve high‐temperature strength and creep resistance, although excessive additions are detrimental. Grain boundary (GB) segregation may improve cohesion and displace embrittling impurities. Finely dispersed carbides and borides are desired to control grain size via GB pinning. However, excessive decoration of GBs may lead to failure during processing and in‐service. Hence, a systematic review on the roles of B, C, and Zr in cast and wrought Ni‐based superalloys is required. The current state of knowledge on GB segregation and precipitation is reviewed. Experimental and modeling results are compared across various processing steps. The impact of GB precipitation on mechanical properties is most well researched. Co‐precipitation in proximity to GBs interacting with local microstructure evolution and mechanical properties remains less explored. Addressing these gaps in knowledge allows a more complete understanding of processing–microstructure–properties relationships in advanced cast and wrought Ni‐based superalloys.

show abstract