Influence of Vibration and Heat Treatment on Residual Stress of a Machined 12%Cr-Steel

Ru, Lin Peng; Moverare, Johan; Avdovic, Pajazit; Billenius, Annethe

doi:10.4028/www.scientific.net/amr.996.609

Cited by 3 publications

References 10 publications

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Comparison of the thermal and vibrational stress relief methods in terms of mechanical and metallurgical aspects of rolled AA2024 specimens

Jafari Vardanjani,

Safavi

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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Vibrational stress relief (VSR) and thermal stress relief (TSR) are among the most common treatments after manufacturing processes to enhance the mechanical and metallurgical qualities of the products. Residual stress relief is of the important purposes for such treatments. In this study VSR and TSR treatments are compared regarding the mechanical and metallurgical properties of cold rolled AA2024 specimens. VSR and TSR treatments are separately performed on the identical cold rolled specimens after which dimensional distortion, tensile strength, hardness, and microstructure are evaluated on the specimens while residual stress has been analyzed in finite element model. According to the results, VSR treatment has had better performance in the field of distortion reduction, tensile strength, and elasticity modulus by 25.00%, 2.21%, and 2.98% respectively, while TSR had a slightly more constructive effect on hardness by 2.91%. These could be due to the metallurgical slight effect of stable grain size and shape in VSR versus minor grain growth for TSR. Finite element analysis results have also demonstrated the average reduction of the equivalent residual stress about 31% after TSR treatment, and about 42% after VSR treatment. Grain shape has been influenced slightly by VSR due to minor plastic deformations during mechanical vibration compared to TSR, while grain size has been observed to be slightly more in TSR due to minor grain growth.

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Comparison of the thermal and vibrational stress relief methods in terms of mechanical and metallurgical aspects of rolled AA2024 specimens

Jafari Vardanjani,

Safavi

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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Residual Stress Relaxation of Thin-walled Long Stringer Made of Aluminum Alloy 7050-T7451 under Transportation Vibration

Yang

Jin

et al. 2020

Chin. J. Mech. Eng.

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Thin-walled long stringer made of aluminum alloy 7050-T7451 is prone to deformation during transportation, so a research of residual stress relaxation was launched in this paper. The transport resonance stress of long stringer was analyzed based on the power spectral density of road transport acceleration. The residual stress relaxation experiment of aluminum alloy 7050-T7451 under different equivalent stress levels was designed and carried out. According to the amount of residual stress relaxation in the experiment, an analytical model was established with the equivalent stress level coefficient. The deflection range of long stringer was evaluated under different damping ratios. The results show that when the equivalent stress exceeds 0.8σ 0.2 , the residual stress relaxation of the thin-walled samples occurs. The residual stress relaxation increases linearly with the equivalent stress, which is logarithmically related to the loading cycle. The deformation caused by residual stress relaxation of the long stringer is proportional to the square of the length and the bending moment caused by stress rebalance, and inversely proportional to the moment of inertia of the structure. As the damping ratio decreases from 0.03 to 0.01, the total deflection of the long stringer increases from 0 to above 1.55 mm.

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Surface Integrity of Broached Inconel 718 and Influence of Thermal Exposure

Chen¹

2014

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Inconel 718 is a nickel-based superalloy that is extensively used as a disc material in gas turbine engines. The service life of gas turbine discs is normally governed by the modes of material degradation and fatigue failure since they work mostly at high temperatures and are subjected to cyclic mechanical loadings. Fatigue failures often start with the initiation of cracks at the surface and the precise details of the failure process significantly depend on the surface conditions. In turbine disc production, one of the last manufacturing steps is to broach root fixings, commonly of fir-tree design, for blade mounting. It has always been a challenge when machining Inconel 718 due to its high strength retention at elevated temperatures, rapid work hardening, as well as low thermal conductivity. This usually leads to rapid tool wear, and consequently shorter tool life, and at the end to the deterioration of the surface integrity of the machined components.

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Influence of Vibration and Heat Treatment on Residual Stress of a Machined 12%Cr-Steel

Cited by 3 publications

References 10 publications

Comparison of the thermal and vibrational stress relief methods in terms of mechanical and metallurgical aspects of rolled AA2024 specimens

Comparison of the thermal and vibrational stress relief methods in terms of mechanical and metallurgical aspects of rolled AA2024 specimens

Residual Stress Relaxation of Thin-walled Long Stringer Made of Aluminum Alloy 7050-T7451 under Transportation Vibration

Surface Integrity of Broached Inconel 718 and Influence of Thermal Exposure

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