Effects of microshot peening on surface characteristics of high-speed tool steel

Harada, Yasunori; Fukauara, K.; Kohamada, Suguru

doi:10.1016/j.jmatprotec.2007.11.247

Cited by 43 publications

(26 citation statements)

References 10 publications

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“…G. H. Farrahi et al [8] studied effect of various surface treatments on AISI D3 cold work tool steel and conveyed 14% improvement in fatigue life by using shot peening. Y. Harada et al [9] did research on micro shot peening of high speed tool steel and claimed significant increase in fatigue performance. They also examined effect of processing temperature used during peening and reported enhanced peening effect at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Bhavar¹,

Patil²,

Kattire³

et al. 2017

MSCE

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Shot peening is one of the most popular surface enhancement technique used to improve fatigue performance of different materials. This paper focuses on to study the effect of different shot peening parameters on micro-structural and mechanical properties of DIN 1.2714 tool steel specimens. Shot peening treatments were carried out by varying shot size and peening intensity. X-ray stress analysis, micro-hardness testing and micro-structural analysis were performed to characterize these specimens. In addition, pin on disk wear testing was executed to recognize wear behavior of this shot peened tool steels. It was observed that along with compressive residual stress generation, shot peening also induces work hardening effect and modifies surface structure which are responsible for significant improvement in this tool steel.

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Section: Introductionmentioning

confidence: 99%

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Bhavar¹,

Patil²,

Kattire³

et al. 2017

MSCE

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“…Harada et al [15] examined the influence of shot peening on the surface characteristics of AISI M2, a molybdenum-type high-speed steel. SP with cemented carbide microshots improved surface characteristics as compressive residual stresses up to 2000 MPa were generated near the surface at low surface roughness.…”

Section: Fig 1 Schematic Representation Of the Lsp Processmentioning

confidence: 99%

Effects of Laser Shock Peening on the Surface Integrity of 18 % Ni Maraging Steel

Petan¹,

Ocaña²,

Grum³

2016

SV-JME

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Maraging steels represent a special group of ultrahigh strength steels which can be hardened by precipitation of intermetallic compounds at temperatures around 480 °C [1]. These steels have a high content nickel, cobalt, and molybdenum, while the content of carbon, considered an impurity, is kept as low as possible. Commercially available maraging steels can reach yield strengths up to 2400 MPa. In addition to high strength, they are characterized by high resistance to thermal fatigue, high fracture toughness, and good weldability [2]. In order to achieve martensitic transformation during quenching, lower cooling rates are sufficient, and there is less probability for cracking to occur. During age hardening there is very little distortion. Therefore, parts can be machined to final dimensions before the aging process. Maraging steels were primarily developed as high strength structural materials, intended for applications in aeronautical and aerospace. Later on, because of their superior mechanical properties, maraging steels started to be used in the manufacturing of tools [3] such as molds and die-casting dies. Maraging steels are used for the manufacturing of mechanical parts and tools which operate in demanding environments and conditions where they are subject to mechanical fatigue, thermomechanical fatigue, corrosion, and wear. These phenomena have a negative effect on fatigue life and may cause an early failure of the mechanical part.Fatigue behavior of highly stressed metallic components can be significantly improved by mechanical surface treatments [4] such as shot peening (SP) and laser shock peening (LSP). LSP is an innovative surface treatment [5] that can increase the fatigue strength of metallic parts by generating compressive residual stresses in the thin layer of the treated surface. During LSP, the surface of the treated component is exposed to nanosecond long laser pulses of intense energy from 5 J to 100 J [6]. The material in the interaction area with the laser beam vaporizes, and by further absorption of laser energy it ionizes and transforms into plasma. The newly created plasma continues to absorb the laser energy and generates pressure on the surface by transmitting shock waves into the treated material, Fig. 1. When shock wave stresses exceed the yield strength, plastic deformation occurs under the interaction zone between the laser beam and the material. The surrounding material prevents dilatation of the irradiated area of the surface layer, generating compressive residual stresses, which can reach depths up to 1 mm [7]. LSP treatment is far Effects of Laser Shock Peening on the Surface Integrity of 18 % Ni Maraging SteelPetan, L. -Ocaña, J. L. -Grum, J. Luca Petan 1 -José Luis Ocaña 2 -Janez Grum 1,* • Surface integrity of untreated and LSP treated maraging steel specimens was analyzed.• LSP generated compressive residual stresses in the maraging steel surface layer.• Strain hardening of the maraging steel surface layer occurred after LSP.• High compressive residual stresses in combina...

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“…By screening the literature dealing with shot peening of different steels and its effects on different loadings [23,[26][27][28][29][32][33][34][35][36][37][38][39][40][41] it becomes clear that shot peening is a very effective and cost efficient post treatment to increase the fatigue strength of steels. To find the optimum shot peening conditions for the steel might be impossible without narrowing down the problem to a specific steel under specific loadings [42].…”

Section: Shot Peeningmentioning

confidence: 99%

Residual Stresses and Fatigue of Shot Peened Cast Iron

Lundberg¹

2013

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ii Cover:Fracture surface of compact graphite iron with a graphite nodule.Printed by: LiU-Tryck, Linköping, Sweden, 2013 ISBN 978-91-7519-501-8 ISSN 0280-7971 Distributed by: Linköping University Department of Management and Engineering 581 83, Linköping, Sweden ©2013 Mattias Lundberg iii AbstractThe complex geometry of cylinder head in heavy-duty diesel engine makes grey cast iron or compact graphite iron a perfect material choice due to its castability, thermal conductivity and damping capacity. To increase the efficiency of the engine, the fatigue property of the material needs to be improved. Shot peening is often used to increase the fatigue strength of components. The benefits are associated with the compressive stresses induced and with surface hardening. In this research project, these effects on grey and compact iron have been analyzed for different shot peening parameters using XRD, SEM and fatigue testing methods. The ultimate aim of the project is to increase the fatigue strength of cast irons by optimization of residual stresses.The XRD measurements and SEM examinations revealed that the shot peening parameters including shot size and peening intensity had significant influences on the resulted residual stresses and strain hardening while changing the coverage made little difference. Also differences in the peening results between the two materials were observed, which were ascribed to an effect of the different graphite morphology. Nevertheless, a residual stress profile similar to the one general considered to improve the fatigue strength in steels could be obtained in both grey and compact iron after shot peening.The axial fatigue testing with R=-1 on the grey iron showed that peening using large shot size and high peening intensity (heavy shot peening) resulted in a fatigue strength reduction of 15-20% in comparison with the mechanically polished surface. The negative effects are likely related to surface damage and relatively high tensile residual stresses in subsurface induced by the heavy peening. Grey cast iron has low ductility in tension and therefore tensile residual stresses may promote multiple cracking and crack networking during cyclic loading.Shot peening using much smaller shots and lower intensity (gentle shot peening) which resulted in a much smaller residual stress field gave no significant changes in fatigue strength. However, a short time annealing at 285°C of specimens being gently shot peened increased the fatigue strength roughly by 10%. The improvement could be an effect of precipitates formed due to the heat treatment, which lock the dislocation movement under cyclic loading. iv v

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Effects of microshot peening on surface characteristics of high-speed tool steel

Cited by 43 publications

References 10 publications

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Effects of Laser Shock Peening on the Surface Integrity of 18 % Ni Maraging Steel

Residual Stresses and Fatigue of Shot Peened Cast Iron

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