Author
M.M. Mayuram
Bio: M.M. Mayuram is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Shot peening & Peening. The author has an hindex of 2, co-authored 2 publications receiving 23 citations.
Topics: Shot peening, Peening, Fatigue limit, Surface integrity
Papers
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TL;DR: In this paper, the S-N curves have been established for shot peened and unpeened gears in a back-to-back gear test rig with and without shot peening.
21 citations
TL;DR: In this article, 24 steel spur gears in untreated and thermal-treated conditions with and without shot peening were tested in a back-to-back gear test rig and the surface finish at the pitch region and wear loss were monitored.
5 citations
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TL;DR: In this article, the residual stress and surface topography obtained by various shot peening treatments were experimentally and theoretically examined, and it was found that the ratio between the layer thickness of compressive stress and the critical depth of maximum stress generally lies in the regime of 3.6-4.3 after shot-peening.
86 citations
TL;DR: In this article, the effect of shot peening coverage on residual stress, surface roughness, microhardness and microstructure of rollers is investigated, and it is shown that the shot-peening leads to a slight increase of surface and near-surface hardness from 690 HV to 740 HV, and an appreciably increasing of the subsurface maximum compressive residual stress.
Abstract: Shot peening is currently becoming a widely used surface strengthening technique that can refine the material grain, increase the hardness and introduce a certain depth of residual compressive stress layer. At the same times it changes the surface topography which may have a deleterious effect on the contact fatigue life. A fully understanding on the mechanism of shot peening for high-strength steels is to be explored. In this paper, the effect of shot peening coverage on residual stress, surface roughness, microhardness and microstructure of rollers are experimentally investigated. Experimental results show that the shot peening leads to a slight increase of surface and near-surface hardness from 690 HV to 740 HV, and an appreciably increasing of the subsurface maximum compressive residual stress. Moreover, some retained austenite in the the near-surface layer are transformed to martensite after shot peening, and wherein the grain refinement occurs.
63 citations
TL;DR: In this article, a multiple-shot model was used to estimate the evolution of shot peening coverage and the influences of coverage on residual stress, plastic strain and surface topography, and the predicted results reveal that as the shot-peening coverage increases from 100% to 400% under the given processing condition, the maximum residual stress and plastic strain will increase gradually.
55 citations
TL;DR: In this article, a random multi-shot model which incorporated dislocation density-based constitutive equations was established, and the effects of peening velocity, peening coverage and double peening on the surface integrity in terms of the residual stress, surface roughness and dislocation cell size were analyzed.
Abstract: Shot peening is widely used to strengthen the surface of metal parts, and its effect is affected by various parameters, such as shot peening coverage, peening intensity, peening velocity, shot size and shot material. In this study, a random multi-shots model which incorporated dislocation density-based constitutive equations was established. With the developed model, the effects of peening velocity, peening coverage and double peening on the surface integrity in terms of the residual stress, surface roughness and dislocation cell size were analyzed. The simulated results show that increasing the peening velocity can significantly thicken the refining layer and the compressive residual stress layer (CRSL), and deepen the location of the maximum compressive residual stress (MCRS). Meanwhile, increasing the peening coverage can heighten the magnitude of MCRS in subsurface, but hardly affects the surface compressive residual stress (SCRS) and the thickness of CRSL. Compared to simply pursuing the improved peening velocity and enhanced coverage, the use of an appropriate double peening process can induce a larger SCRS while reduce the surface roughness slightly.
47 citations
TL;DR: In this paper, the effects of process parameters such as pressure, shot size, stand-off distance, and exposure time on surface microhardness for AISI 1045 and 316L materials were investigated.
Abstract: Shot peening is widely used to improve the fatigue properties of components and structures. Residual stresses, surface roughness, and work hardening are the main beneficial effects induced in the surface layer from shot peening, which depend on the correct choice of the peening parameters. In this investigation, experiments were designed using the full factorial design of experiment (DOE) technique and an air blast type of shot peening machine. Effects of process parameters such as pressure, shot size, stand-off distance, and exposure time on surface microhardness for AISI 1045 and 316L materials were investigated. An ANOVA was carried out to identify the significant peening parameters. In the case of 316L material, the maximum surface hardness was found to be in the range of 450–824 Hv, whereas it was found to be in the range of 314–360 Hv for AISI 1045. A critical assessment was made so as to understand the variation of microhardness in the direction of peening. Empirical equations between the peening parameters and the surface microhardness for both materials were developed, which are useful in predicting the surface microhardness. It is believed that this technique could prove beneficial in industries for reduction of performance variation and cost and to increase productivity.
38 citations