Relationship between Compressive Residual Stress Relaxation and Microhardness Reduction after Cyclic Loads on Shotpeened ASTM A516 Grade 70 Steel

Isa, M. I. N.; Zaroog, Omar Suliman; Ali, Fareg Saeid

doi:10.4028/www.scientific.net/kem.765.232

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…increases towards zero and influences fatigue life in a negative way. Isa et al 28 studied residual stress relaxation after cyclic loading on shot‐peened carbon steel ASTM A516 Grade 70 with the conclusion that relaxation of residual compressive stress occurred due to cyclic loading. Higher loads generated more relaxation.…”

Section: State Of the Artmentioning

confidence: 99%

Analysis of residual stress relaxation of aluminum alloys EN AW 6061/‐82 T6 under cyclic loading

Repplinger

Sellen²,

Kędziora

et al. 2021

Fatigue Fract Eng Mat Struct

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Stress relaxation describes the reduction of stress under static or cyclic loading at a constant strain level. Several processes induce intentionally residual stresses, for example, autofrettage of thick-walled pressurized tubes to improve their fatigue life. This well-known process induces residual compressive stresses at the critical inner surface by using a single static but controlled overloading internal pressure. Relaxation of residual stresses due to cyclic loading in service would endanger the effectiveness of autofrettage and could finally lead to unexpected fatigue failure. In this study, strain-controlled experiments up to 500,000 load cycles and amending nonlinear finite element simulations were done for the aluminum alloys EN AW 6061 T6 and EN AW 6082 T6 to study potential cyclic stress relaxation in four-point bending tests after controlled single static plasticization for residual stress generation. This analysis identifies almost stable residual stresses for both materials under different cyclic strain-controlled load levels.

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Section: State Of the Artmentioning

confidence: 99%

Analysis of residual stress relaxation of aluminum alloys EN AW 6061/‐82 T6 under cyclic loading

Repplinger

Sellen²,

Kędziora

et al. 2021

Fatigue Fract Eng Mat Struct

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“…Blades made of γ-TiAl alloy are used in aero-engines. Their service temperature is generally in the range of 650 °C-850 °C [1,4], and the relaxation of residual stress at high temperature has a great influence on mechanical performance and fatigue of materials [35][36][37]. The distributions of residual stress in X direction of Case 1, Case 4 and Case 5, are shown in figure 11.…”

Section: Evolution Of Residual Stress and Fracture Behavior At Differ...mentioning

confidence: 99%

The effect of residual stress on Σ3(111) twin boundaries fracture behavior in γ-TiAl with molecular dynamics simulation

Feng

Song

et al. 2019

Modelling Simul. Mater. Sci. Eng.

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In this paper, molecular dynamics (MD) simulations are performed to study the influence of residual stress on fracture behavior in γ-TiAl alloy with ∑3(111) twin boundaries. The tensile processes are simulated at 1, 300, 1050 K after the residual stress is introduced by prepressing. The evolution of microdefects during tensile fracture is observed, and the distribution of residual stress in three direction is characterized. Results show that the introduced residual stress is symmetrically distributed on both sides of ∑3(111) twin boundaries. The residual compressive stress can prevent the nucleation of micro-cracks and increase the yield strength. The fracture mode of the γ-TiAl alloy with ∑3(111) twin boundaries during tensile load at 1 K is the nucleation of microcracks at grain boundaries followed by intergranular fracture. The ∑3(111) twin boundaries have good thermal stability. The residual compressive stress is completely released and the amplitude of residual tensile stress increases at 1050 K, and the γ-TiAl alloy with ∑3(111) twin boundaries exhibits good ductility.

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“…The shot peening residual stress in 7075-T651 aluminum alloy sheet relaxes significantly in the first cycle and then tends to be stable. The residual stress has been in a stable state under the condition of low load [12]. In addition, the stress ratio R and temperature also have important influences on the relaxation of residual stress.…”

Section: Introductionmentioning

confidence: 99%

Study on the Changing Law of Cutting and Ultrasonic Strengthening Surface Integrity during Fatigue of Ti-17 Alloy

et al. 2022

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The distribution of surface integrity features directly affects the initiation and propagation of fatigue cracks. In this paper, the surface integrity characteristics changing law of turning and ultrasonic impacting specimens during high cycle fatigue loading has been studied, and the effect of surface modified layer on the fatigue properties of titanium alloy has been revealed. The results showed that the surface roughness increased with the increase of fatigue cycles. The compressive residual stress and its gradient distribution depth decreased continuously. The gradient distribution depth of residual stress in the ultrasonic-impacted surface rapidly decreased by about 50% near the fracture stage. Local cyclic hardening occurred at 20–50 μm from the surface of the specimen in the early stage of fatigue evolution, and then the microhardness continued to decrease. During this process, there were no significant changes in hardened layer depth. The fibrous microstructure of the ultrasonic-impacted surface undergoes a process from coarsening to gradual disintegration during the fatigue process. Its attenuation process needs a longer period of time. The fatigue source of the turned specimen was located at about 320 μm from the surface, and the fatigue source of ultrasonic impact was about 610 μm from the surface. The fatigue striation width of the ultrasonic impact specimen was about 20% narrower than that of the turned specimen. The fatigue life of the ultrasonic impact specimen was increased by 73.9% compared with the turned specimen. The research in this paper is of great significance for exploring the anti-fatigue mechanism and the ability of various surface integrity features.

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Relationship between Compressive Residual Stress Relaxation and Microhardness Reduction after Cyclic Loads on Shotpeened ASTM A516 Grade 70 Steel

Cited by 3 publications

References 11 publications

Analysis of residual stress relaxation of aluminum alloys EN AW 6061/‐82 T6 under cyclic loading

Analysis of residual stress relaxation of aluminum alloys EN AW 6061/‐82 T6 under cyclic loading

The effect of residual stress on Σ3(111) twin boundaries fracture behavior in γ-TiAl with molecular dynamics simulation

Study on the Changing Law of Cutting and Ultrasonic Strengthening Surface Integrity during Fatigue of Ti-17 Alloy

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