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Browsing by Author "Gray, Simon"

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Analysis of combined static load and low temperature hot corrosion induced cracking in CMSX-4 at 550°C

Brooking, Laurie; Gray, Simon; Dawson, K.; Nicholls, John R.; Simms, Nigel J.; Sumner, Joy; Tatlock, G. J. (Elsevier, 2019-10-18)

A CMSX-4 3-point bend specimen was statically loaded under hot corrosion conditions and SEM, (S)TEM and EDX techniques were used to analyse the cracking generated. Sulphur, chlorine, sodium and oxygen were found at the ...
A bi-objective decision support tool based on system dynamics and discrete event modelling for sustainable supply chain

Yu, Jia; Hieu, Trung; Gray, Simon; Encinas-Oropesa, Adriana (DSRPT Consultancy, 2023-07-24)

Based on the development trend of sustainable concepts and the implement ability of composites combined with Agave Bagasse Fibre (ABF) and Polyethylene Terephthalate (PET). The purpose of this paper is to design a bi-objective ...
Combined hot corrosion and static stress or fatigue of single crystal superalloys.

Brooking, Laurie Finian (2018-09)

It has been observed that gas turbine (GT) blades operating in harsh environments can undergo material degradation in the form of crack initiation and propagation before that predicted by fatigue lifing. It is thought that ...
Corrosion fatigue testing: the combined effect of stress and high temperature corrosion

Chapman, Neil; Brooking, Laurie; Sumner, Joy; Gray, Simon; Nicholls, John R. (Taylor & Francis, 2017-10-20)

A corrosive environment can have a detrimental effect on the fatigue life of a material due to a change in failure mechanism. Attempts have been made to replicate this change on nickel-base superalloy CMSX-4 cast in the ...
Effect of NaCl and SO2 on the stress corrosion cracking of CMSX-4 at 550°C

Duarte Martinez, Fabian; Syed, Adnan; Dawson, K.; Tatlock, G. J.; Morar, N. I.; Kothari, M.; Tang, C.; Leggett, J.; Mason-Flucke, J. C.; Gibson, G.; Nicholls, Nicholls, John R.; Gray, Simon; Castelluccio, Gustavo M. (Taylor and Francis, 2023-05-01)

In the pursuit of more efficient gas turbine engines, components are required to operate for longer times at elevated temperatures. This increased time in service, together with a complex loading regime, can expose the ...
Effect of stress state and simultaneous hot corrosion on the crack propagation and fatigue life of single crystal superalloy CMSX-4

Brooking, Laurie; Gray, Simon; Sumner, Joy; Nicholls, John R.; Marchant, G.; Simms, Nigel J. (Elsevier, 2018-05-03)

Operating conditions within industrial gas turbines are changing in response to pressures to reduce environmental impact and enable use of renewable sources. This is driving an increase in the operational temperatures and ...
The effect of trepanning speed of laser drilled acute angled cooling holes on the high temperature low cycle corrosion fatigue performance of CMSX-4 at 850 °C

Morar, Nicolau; Roy, Rajkumar; Mehnen, Jorn; Nicholls, John R.; Gray, Simon (Elsevier, 2017-05-04)

The effect of laser trepanning speed and, as a result, recast layer thickness on the high temperature corrosion fatigue behaviour of CMSX-4 superalloy acute angled holes was investigated. The experimental test results show ...
The effect of trepanning speed of laser drilled acute angled cooling holes on the high temperature low cycle corrosion fatigue performance of CMSX-4 at 850°C

Morar, N.; Roy, Rajkumar; Mehnen, Jorn; Nicholls, John R.; Gray, Simon (Elsevier, 2017-05-04)

The effect of laser trepanning speed and, as a result, recast layer thickness on the high temperature corrosion fatigue behaviour of CMSX-4 superalloy acute angled holes was investigated. The experimental test results show ...
The effect of volatilisation of refractory metal oxides on the cyclic oxidation of Ni-base superalloys

Brewster, Gyaneshwara; Edmonds, I. M.; Gray, Simon (Springer Science Business Media, 2014-04-01)

The role of refractory metals on the bare oxidation behaviour of a range of compositionally complex single crystal Ni-base superalloys has been investigated using a range of techniques. It has been shown that this series ...
Environmentally assisted cracking of a single crystal nickel-based superalloy

Dawson, Karl; Duarte Martinez, Fabian; Gray, Simon; Nicholls, John; Gibson, G.; Leggett, J.; Tatlock, G. J. (Taylor and Francis, 2023-03-03)

Single crystal material, of CMSX-4® alloy composition, was cast and secondary orientation was controlled at the machining stage, to produce c-ring cross-section tubes with known crystallographic orientations. The c-ring ...
Impact of deposit recoat cycle length on hot corrosion of CMSX-4

Sumner, Joy; Aksoul, Quentin; Delgado, Joemar; Potter, Andrew; Gray, Simon (Springer, 2017-04-05)

Hot corrosion causes significant problems for both aerospace and power generation industries, where the combination of high temperature, corrosive gases, and contaminants severely limits component operating lifetimes in ...
Influence of shot peening on high-temperature corrosion and corrosion-fatigue of nickel based superalloy 720Li

Gibson, G. J.; Perkins, K. M.; Gray, Simon; Leggett, A. J. (Taylor and Francis, 2016-04-08)

High-temperature corrosion fatigue, a combination of corrosion with a fatigue cycle, is an emerging generic issue affecting power generation and aero gas turbine engines and has the potential to limit component life. ...
Interaction of hot corrosion fatigue and load dwell periods on a nickel-base single crystal superalloy

Brooking, Laurie; Gray, Simon; Sumner, Joy; Nicholls, John R.; Simms, Nigel (Elsevier, 2018-07-25)

The effects of type II hot corrosion on the fatigue resistance of turbine blade superalloys is of growing interest as gas turbine (GT) original equipment manufacturers (OEMs) strive to optimise the operational efficiencies ...
Interaction of stress corrosion cracks in single crystals Ni-Base superalloys

Elsherkisi, Mustafa; Martinez, Fabian Duarte; Mason-Flucke, Julian; Gray, Simon; Castelluccio, Gustavo M. (Elsevier, 2024-02-02)

Stress corrosion cracking (SCC) can be detrimental to nickel-based superalloy components exposed to harsh environments in aero-gas turbines. During flight, engines consume contaminants deposited on the surface of a blade, ...
Investigation into the effects of salt chemistry and SO2 on the crack initiation of CMSX-4 in static loading conditions

Martinez, Fabian Duarte; Morar, Nicolau I.; Kothari, Maadhav; Gibson, G.; Leggett, J.; Mason-Flucke, J. C.; Nicholls, John R.; Castelluccio, Gustavo M.; Gray, Simon (Springer, 2020-08-29)

Although evidence exists of the potential impact of stress, co-incident with corrosive environments at high temperature, for single crystal turbine blades, the mechanism responsible is not fully understood. This work ...
Investigation into the environmental assisted crack initiation mechanism of CMSX-4 in simulated aero engine environments at 450 - 550°C.

Duarte Martinez, Fabian (Cranfield UniversitySATM, 2023-03)

The aviation industry has continued to increase the efficiency of gas turbine engines, which are now designed to operate on a wide variety of flight routes. In general, the efficiency drive has led to components spending ...
Investigation of recast and crack formation in laser trepanning drilling of CMSX-4 angled holes

Iralal Morar, Nicolau; Roy, Rajkumar; Mehnen, Jorn; Marithumu, Sundar; Gray, Simon; Roberts, Tracey; Nicholls, John R. (Springer, 2018-01-03)

This paper presents an experimental investigation on the influences of laser trepanning drilling process parameters on the recast layer thickness and surface crack formation in CMSX-4 nickel-based superalloy angled holes. ...
Low temperature hot corrosion screening of single crystal superalloys

Smialek, James L.; Gray, Simon (MDPI, 2018-10-25)

Single crystal superalloys were screened in Type II molten (Na,K)-sulfate hot corrosion re-coat tests in air +300 ppm SO2 at 700 °C. They exhibited large 20–40 mg/cm2 weight changes, repeated spallation, and non-protective, ...
Machine learning applied to identify corrosive environmental conditions

Lee, HsinYen; Gray, Simon; Zhao, Yifan; Castelluccio, Gustavo M. (Frontiers, 2022-04-04)

The reliability of turbine engines depends significantly on the environment experienced during flight. Air humidity, corrosive contaminant substances, and high operating temperatures are among the attributes that affect ...
Measurement and evaluation of co-existing crack propagation in single-crystal superalloys in hot corrosion fatigue environments

Brooking, L.; Ferguson, C.; Mason-Flucke, J.; Gibson, G.; Leggett, J.; Palmer, I.; Nicholls, John R.; Gray, Simon (Springer, 2021-08-29)

Gas turbines blades are required to operate at high temperatures while being subjected to stress and corrosive environments. These demanding conditions have led to the need to better understand the interactions between ...

Browsing by Author "Gray, Simon"

Browsing by Author "Gray, Simon"

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