Residual Stress Stability in High Temperature Fatigued Mechanically Surface Treated Metallic Materials

Different classes of metallic materials (aluminum alloys, steels, titanium alloys) were mechanically surface treated by deep rolling and laser shock peening and isothermally fatigued at elevated temperature under stress control. The fatigue tests were interrupted after different numbers of cycles for several stress amplitudes and residual stresses and FWHM-values were measured by X-ray diffraction methods at the surface and as a function of depth. The results summarize the response of the surface treatment induced residual stress profiles to thermomechanical loading conditions in the High Cycle Fatigue (HCF)- as well as in the Low Cycle Fatigue (LCF) regime. The effects of stress amplitude, plastic strain amplitude, temperature and frequency are addressed in detail and discussed. The results indicate that residual stress relaxation during high temperature fatigue can be predicted for sufficiently simplified loading conditions and that thermal and mechanical effects can be separated from each other. A plastic strain based approach appears to be most suitable to describe residual stress relaxation. Frequency effects were found to be not very pronounced in the frequency range investigated.

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Corrosion of metals and alloys. Test method for high temperature corrosion testing of metallic materials by embedding in salt, ash, or other solids

10.3403/30259851u ◽

2015 ◽

Keyword(s):

High Temperature ◽

High Temperature Corrosion ◽

Metals And Alloys ◽

Corrosion Testing ◽

Test Method ◽

Metallic Materials

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Temperature Dependent Residual Stress Models for Ultra-High-Temperature Ceramics on High Temperature Oxidation

Applied Composite Materials ◽

10.1007/s10443-016-9548-6 ◽

2016 ◽

Vol 24 (4) ◽

pp. 879-891 ◽

Cited By ~ 3

Author(s):

Ruzhuan Wang ◽

Weiguo Li

Keyword(s):

Residual Stress ◽

High Temperature ◽

High Temperature Oxidation ◽

Temperature Dependent ◽

Temperature Oxidation ◽

Ultra High Temperature Ceramics ◽

Stress Models ◽

Ultra High Temperature

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High temperature abrasive wear of metallic materials

Wear ◽

10.1016/j.wear.2016.12.042 ◽

2017 ◽

Vol 376-377 ◽

pp. 443-451 ◽

Cited By ~ 22

Author(s):

M. Varga

Keyword(s):

High Temperature ◽

Abrasive Wear ◽

Metallic Materials

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Measurement of Young’s modulus and residual stress of thin SiC layers for MEMS high temperature applications

Microsystem Technologies ◽

10.1007/s00542-011-1419-3 ◽

2012 ◽

Vol 18 (7-8) ◽

pp. 945-953 ◽

Cited By ~ 5

Author(s):

Oliver Pabst ◽

Michael Schiffer ◽

Ernst Obermeier ◽

Tolga Tekin ◽

Klaus Dieter Lang ◽

...

Keyword(s):

Residual Stress ◽

High Temperature ◽

Young’S Modulus ◽

Young's Modulus ◽

Temperature Applications

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Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

Materials ◽

10.3390/ma12060930 ◽

2019 ◽

Vol 12 (6) ◽

pp. 930 ◽

Cited By ~ 12

Author(s):

Martin Malý ◽

Christian Höller ◽

Mateusz Skalon ◽

Benjamin Meier ◽

Daniel Koutný ◽

...

Keyword(s):

Residual Stress ◽

High Temperature ◽

Residual Stresses ◽

Relative Density ◽

Selective Laser Melting ◽

Process Parameters ◽

Stress Reduction ◽

Laser Melting ◽

Preheating Temperature ◽

Laser Velocity

The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature preheating and time delay. Residual stresses were evaluated by the bridge curvature method and relative density by the optical method. The effect of the observed process parameters was estimated by the design of experiment and surface response methods. It was found that for an effective residual stress reduction, the high preheating temperature was the most significant parameter. High preheating temperature also increased the relative density but caused changes in the chemical composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for Grade 5 titanium.

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