scholarly journals An evaluation of the evolution of workpiece surface integrity in hole making operations for a nickel-based superalloy

2012 ◽  
Vol 212 (8) ◽  
pp. 1723-1730 ◽  
Author(s):  
C.R.J. Herbert ◽  
J. Kwong ◽  
M.C. Kong ◽  
D.A. Axinte ◽  
M.C. Hardy ◽  
...  
Keyword(s):  
Surface Integrity ◽  
Workpiece Surface ◽  
Nickel Based Superalloy ◽  
Hole Making

Influence of Surface Anomalies Following Hole Making Operations on the Fatigue Performance for a Nickel-Based Superalloy

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
C. Herbert ◽  
D. A. Axinte ◽  
M. Hardy ◽  
P. Withers
Keyword(s):  
Free Surface ◽  
Fatigue Life ◽  
Surface Integrity ◽  
Low Cycle Fatigue ◽  
White Layer ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Nickel Based Superalloy ◽  
Aero Engine ◽  
Hole Making

Aero-engine manufacturers are continuously striving to improve component performance and reliability while seeking to increase the efficiency of manufacturing to reduce costs. Efficiency gains by using higher rates of material removal, however, can be counter-productive if they give rise to surface anomalies that distort the material microstructure and reduce the resistance of the material to fatigue crack nucleation. This paper investigates the effect of hole making processes and parameters on surface integrity and the initiation of cracks from low-cycle fatigue (LCF). It reports the dependence of elevated temperature (600 °C) low-cycle fatigue performance of nickel alloy RR1000 from surfaces produced from hole making and subsequent surface conditioning. As-machined surfaces include a reference “damage-free” surface, and two distorted microstructures: (i) a white layer, produced to a depth of 5 and 10 μm and (ii) a distorted gamma prime (γ') structure, produced to a depth of 10 and 15 μm. The effect of shot peening damage-free and 10 μm deep white layer surfaces was also evaluated. It was found that the presence of white layer significantly reduced fatigue performance compared with that shown by the damage-free surface, regardless of whether the white layer was subsequently shot peened or not. In contrast, surfaces showing distorted γ' structures produced much less debit in fatigue life and only from a depth of 15 μm. These results have been rationalized from an examination of fracture surfaces and from measurement of residual stresses before and after fatigue testing. This research is of particular importance as it is among the few reports that quantify the effect of different levels of work piece surface integrity on the fatigue life of a nickel-based superalloy that has been developed for critical rotating components in aero-engine applications.

Workpiece Surface Integrity of GH4169 Nickel-Based Superalloy when Employing Abrasive Belt Grinding Method

2014 ◽  
Vol 936 ◽  
pp. 1252-1257 ◽  
Author(s):  
Gui Jian Xiao ◽  
Yun Huang ◽  
Yu Hang Yang ◽  
Hao Yi
Keyword(s):  
Surface Roughness ◽  
Surface Integrity ◽  
Industrial Applications ◽  
Belt Grinding ◽  
Workpiece Surface ◽  
Energy Applications ◽  
Abrasive Belt ◽  
Grinding Processes ◽  
Nickel Based Superalloy ◽  
Engine Components

The use of GH4169 nickel-based superalloy for the manufacture of gas turbine engines components for aerospace/energy applications has become a routine exercise. However, components with complex designs specifications might pose manufacturing challenges especially when grinding processes are needed to enable their compliance with tight industrial standards for workpiece surface integrity. Information on grinding processes for such sensitive industrial applications is scarce. The paper reports on the influence of grinding methods/strategies on the quality and integrity of workpiece surfaces obtained after abrasive belt grinding methods on GH4169 nickel-based superalloy. The influences of grinding speed, contact pressure and oscillation frequency on surface roughness were discussed. The performance of the abrasive belt and surface topography were discussed. As a result, the maximum surface roughness of Ra is 0.072μm, and have a good performance of the abrasive belt, it could be concluded that abrasive belt grinding might be considered as a viable process for grinding aero-engine components.

scholarly journals Evaluation of Workpiece Surface Integrity Following Point Grinding of Advanced Titanium and Nickel Based Alloys

Procedia CIRP ◽  
2016 ◽  
Vol 45 ◽  
pp. 47-50 ◽  
Author(s):  
D.T. Curtis ◽  
S.L. Soo ◽  
D.K. Aspinwall ◽  
A.L. Mantle
Keyword(s):  
Surface Integrity ◽  
Workpiece Surface

Workpiece surface integrity considerations when finish turning gamma titanium aluminide

Wear ◽  
2001 ◽  
Vol 249 (5-6) ◽  
pp. 473-481 ◽  
Author(s):  
A.R.C. Sharman ◽  
D.K. Aspinwall ◽  
R.C. Dewes ◽  
P. Bowen
Keyword(s):  
Surface Integrity ◽  
Titanium Aluminide ◽  
Gamma Titanium Aluminide ◽  
Workpiece Surface ◽  
Finish Turning ◽  
Gamma Titanium
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