Residual Stresses in Steel Specimens Induced by Laser Cladding and their Effect on Fatigue Strength

Köhler, Henry; Partes, Knut; Rebelo-Kornmeier, Joana; Vollertsen, Frank

doi:10.1016/j.phpro.2012.10.048

Cited by 41 publications

(10 citation statements)

References 9 publications

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“…It has high application value especially in repair and remanufacture (Leunda et al, 2011;Liu et al, 2011;Ai-Yong et al, 2011). However, Laser cladding deposition is a thermoforming causing materials with pores, high residual stress and low fatigue strenth for limitation of manufacturing principle (Zhou et al, 2015;Plati et al, 2006;KöHler et al, 2012), which restricts the application of this technology.…”

Section: Introductionmentioning

confidence: 99%

An approach to reduce stress and defects: a hybrid process of laser cladding deposition and shot peening

Zhang

Geng

2021

RPJ

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Purpose Laser cladding deposition is limited in industrial application by the micro-defects and residual tensile stress for the thermal forming process, leading to lower fatigue strength compared with that of the forging. The purpose of this paper is to develop an approach to reduce stress and defects. Design/methodology/approach A hybrid process of laser cladding deposition and shot peening is presented to transform surface strengthening technology to the overall strengthening technology through layer-by-layer forming and achieve enhancement. Findings The results show that the surface stress of the sample formed by the hybrid process changed from tensile stress to compressive stress, and the surface compressive stress introduced could reach more than four times the surface tensile stress of the laser cladding sample. At the same time, internal micro-defects such as pores were reduced. The porosity of the sample formed by the hybrid process was reduced by 90.12% than that of the laser cladding sample, and the surface roughness was reduced by 43.16%. Originality/value The authors believe that the hybrid process proposed in this paper can significantly expand the potential application of laser cladding deposition by solving its limitations, promoting its efficiency and applicability in practical cases.

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Section: Introductionmentioning

confidence: 99%

An approach to reduce stress and defects: a hybrid process of laser cladding deposition and shot peening

Zhang

Geng

2021

RPJ

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“…The LMD process is accompanied by the repeated rapid heating and cooling of molten pool. Owing to a heterogeneous response of heat conduction and heat dissipation, the high residual stress, which is a domain drawback for the corrosion, fracture resistance, and fatigue performance, is easily to produce in the deposition itself and at the interface between clad and substrate areas as a result of the fast-cooling rates and the difference in thermal expansion coefficients [ 76 , 77 , 78 , 79 , 80 ]. The residual stress would be generated by the constrained thermal shrinkage, which is caused by the transient temperature gradients, the different coefficient of thermal expansion between the substrate and deposition, and the changes in specific density caused by transformation of solid phase [ 18 , 81 , 82 ].…”

Section: Residual Stress and Crackmentioning

confidence: 99%

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

2022

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Owing to the unparalleled advantages in repairing of high value-add component with big size, fabricating of functionally graded material, and cladding to enhance the surface properties of parts, the laser material deposition (LMD) is widely used. Compared to the continuous wave (CW) laser, the controllability of the laser energy would be improved and the temperature history would be different under the condition of pulse wave (PW) laser through changing the pulse parameters, such as duty cycle and pulse frequency. In this paper, the research status of temperature field simulation, surface quality, microstructural features, including microstructures, microhardness, residual stress, and cracking, as well as corrosion behavior of metallic coating created by pulsed laser material deposition have been reviewed. Furthermore, the existing knowledge and technology gaps are identified while the future research directions are also discussed.

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“…These residual stresses are formed by a superposition of thermal and transformation processes and can reach high values close to the yield stress of the material. The presence of tensile residual stresses is detrimental in physical processes as, for instance, fatigue or, in combination with defects, promotes brittle fractures [12]. In general, tensile residual stresses arise due to shrinkage, conversely, compressive stresses due to phase transformation, the effect of which would be dominant depending on the particular situation, i.e., material, geometry and temperature field [13].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Laser Additive Manufactured H13 Tool Steel

Trojan

Ocelík

Čapek

et al. 2022

Metals

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Hot working tool steel (AISI H13) is one of the most common die materials used in casting industries. A die suffers from damage due to friction and wear during its lifetime. Therefore, various methods have been developed for its repair to save costs to manufacture a new one. A great benefit of laser additive manufacturing (cladding) is the 3D high production rate with minimal influence of thermal stresses in comparison with conventional arc methods. Residual stresses are important factors that influence the performance of the product, especially fatigue life. Therefore, the aim of this contribution is to correlate the wide range of results for multilayer cladding of H13 tool steel. X-ray and neutron diffraction experiments were performed to fully describe the residual stresses generated during cladding. Additionally, in-situ tensile testing experiments inside a scanning electron microscope were performed to observe microstructural changes during deformation. The results were compared with local hardness and wear measurements. Because laser cladding does not achieve adequate accuracy, the effect of necessary post-grinding was investigated. According to the findings, the overlapping of beads and their mutual tempering significantly affect the mechanical properties. Further, the outer surface layer, which showed tensile surface residual stresses and cracks, was removed by grinding and surface compressive residual stresses were described on the ground surface.

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Residual Stresses in Steel Specimens Induced by Laser Cladding and their Effect on Fatigue Strength

Cited by 41 publications

References 9 publications

An approach to reduce stress and defects: a hybrid process of laser cladding deposition and shot peening

An approach to reduce stress and defects: a hybrid process of laser cladding deposition and shot peening

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

Microstructure and Mechanical Properties of Laser Additive Manufactured H13 Tool Steel

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