Journal ArticleDOI
Residual stress relaxation in an AISI 4140 steel due to quasistatic and cyclic loading at higher temperatures
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TLDR
In this paper, shot peening induced residual stresses in normalized condition and in quenched and tempered condition of the steel AISI 4140 (German grade 42 CrMo 4) were investigated in annealing experiments, quasistatic loading experiments and bending fatigue experiments at 25, 250 and 400°C.Abstract:
Residual stresses can be relaxed by supplying sufficiently high amounts of thermal and/or mechanical energy, which converts the residual elastic strains to microplastic strains. In order to better understand this relaxation behavior, shot peening induced residual stresses in normalized condition and in quenched and tempered condition of the steel AISI 4140 (German grade 42 CrMo 4) were investigated in annealing experiments, quasistatic loading experiments and bending fatigue experiments at 25, 250 and 400°C. The residual stress relaxation during alternating bending occurs in different regimes. First, thermal relaxation reduces the residual stresses during specimen heating. The relaxation during the first cycle can be discussed on the basis of the effects due to quasistatic loading, if the inhomogeneous distribution of the loading stress is taken into account. Differences in the behavior after the two heat treatments result from the Bauschinger-effect and effects of dynamic strain ageing. Owing to cyclic creep effects, the interval between the first cycle (N=1) and the number of cycles to crack initiation Ni is characterized by residual stresses which decrease linearly with the logarithm of N. Finally for N>Ni the reduction of residual stresses with the logarithm of N is stronger than linear.read more
Citations
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Journal ArticleDOI
Residual stress and its role in failure
TL;DR: In this article, the origins of residual stress are understood, opportunities for removing harmful or introducing beneficial residual stresses recognized, their evolution in-service predicted, their influence on failure processes understood and safe structural integrity assessments made, so as to either remove the part prior to failure, or to take corrective action to extend life.
Journal ArticleDOI
Constitutive modeling for elevated temperature flow behavior of 42CrMo steel
TL;DR: In this paper, the compressive deformation behavior of 42CrMo steel was investigated at the temperatures from 850 to 1150 ǫ c and strain rates from 0.01 to 50 s−1 on Gleeble-1500 thermo-simulation machine.
Journal ArticleDOI
An evaluation of shot peening, residual stress and stress relaxation on the fatigue life of AISI 4340 steel
TL;DR: In this article, the authors evaluated the fatigue life of AISI 4340 steel, used in landing gear, under four shot peening conditions and found that relaxation of the residual stress field occurred due to the fatigue process.
Journal ArticleDOI
On the influence of mechanical surface treatments—deep rolling and laser shock peening—on the fatigue behavior of Ti–6Al–4V at ambient and elevated temperatures
TL;DR: In this paper, the effect of DR on the low-cycle fatigue (LCF) and high cycle fatigue (HCF) behavior of a Ti-6Al-4V alloy is examined, with particular emphasis on the thermal and mechanical stability of the residual stress states and the near-surface microstructures.
Journal ArticleDOI
Investigation of residual stress relaxation under cyclic load
TL;DR: In this article, an analytical model is proposed for estimation of residual stress relaxation, considering the magnitude and distribution of the residual stress, the degree of cold working required, the applied alternating and mean stresses, and the number of applied loading cycles.
References
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Journal ArticleDOI
Surface residual stresses, surface topography and the fatigue behavior of Ti-6AI-4V
TL;DR: In this article, the influence of surface residual stresses and surface topography on low and high cycle fatigue properties was investigated on Ti-6Al-4V from 293 to 589 K.
Journal ArticleDOI
B. Scholtes. Eigenspannungen in mechanisch randschichtverformten Werkstoffzuständen – Ursachen, Ermittlung und Bewertung. DGM Informationsgesellschaft mbH, Oberursel 1991, 367 Seiten, zahlreiche Abb. u. Tabellen
Book ChapterDOI
Relaxation of residual stresses by annealing or mechanical treatment
TL;DR: In this article, the current knowledge of the relaxation of residual stresses is presented in a condensed and as far as possible, systematic form, and the effect of characteristic properties on the onset and rate of relaxation by annealing, uniaxial and cyclic deformation is verified by typical examples of experimental results.
Journal ArticleDOI
Changes in residual stress during the tension fatigue of normalized and peened SAE 1040 steel
M. McClinton,Jerome B. Cohen +1 more
TL;DR: In this article, the tension-tension fatigue of normalized SAE 1040 steel under applied stress control, compressive residual stresses developed, but only in or near deformation markings, were eliminated during fatigue and replaced by tensile residual stresses, when the applied fatigue stress is above the endurance limit.
Journal ArticleDOI
Ursachen, Ermittlung und Bewertung von Randschichtveränderungen durch Kugelstrahlen
B. Scholtes,Otmar Vöhringer +1 more
TL;DR: In this article, the effects of shot peening on the near surface plastic deformations are investigated, and the effect of important process parameters on the surface materials state is considered, such as the microstructure, the porosity and the texture.