Laser surface hardening of H13 steel in the melt case

Chiang, Kwo‐An; Chen, Yong‐Chwang

doi:10.1016/j.matlet.2005.02.026

Cited by 70 publications

(32 citation statements)

References 8 publications

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“…Occasionally, some original undissolved fine carbides are also present in this zone. This observation agrees well with findings of other authors [10][11][12] revealed in similar AISI H13 tool steel. The subsolidus microstructure just beneath the re-melted zone i.e.…”

Section: Microstructural Analysessupporting

confidence: 94%

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

Šebek¹,

Falat²,

Kováč³

et al. 2017

Archives of Metallurgy and Materials

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The present study deals with the effects of laser surface treatment on microstructure evolution and wear resistance of AISI H11 hot work tool steel in quenched and tempered condition. The most upper laser-affected zone is characterized by re-melted microstructure consisting of dendrite cells with fresh non-tempered martensite, retained austenite and inter-dendritic carbidic network. The subsolidus microstructure just beneath the re-melted zone represents the most laser surface hardened zone consisting of fresh non-tempered martensite with fine and coarse carbides as a result of overheating the original QT substrate microstructure. The highest microhardness values in the range from 775 to 857 HV were measured for the LSH microstructure and the most softened microstructure exhibited the minimum hardness of 530 HV. The laser treated samples showed the improvement of their surface wear resistance by 35%.

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Section: Microstructural Analysessupporting

confidence: 94%

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

Šebek¹,

Falat²,

Kováč³

et al. 2017

Archives of Metallurgy and Materials

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“…The automotive industry, in which wear resistance on certain surfaces is desired, has been one of the most important application areas for laser hardening [2]. Recent reviews of the principles and applications of laser treatments describe the use of lasers as a controlled heat source for transformation hardening [3][4][5][6][7][8][9][10]. These research results assist with evaluations of the feasibility of laser treatments for repair methods.…”

Section: Introductionmentioning

confidence: 99%

Application of direct laser melting to restore damaged steel dies

et al. 2011

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Direct laser melting (DLM) technology can be applied to restore damaged steel dies. To understand the effects of DLM process parameters such as the laser power and scan rate, a series of experiments was conducted to determine the optimal operating parameters. To investigate the laser melting characteristics, the depth/height ratio, depth/width ratio and micro-hardness as a function of the laser energy density were analyzed. Fe-Cr and Fe-Ni layers were deposited on a steel die with 11.38 J/mm 2 of energy input. The wear-resistance and the friction coefficient of the deposited layer were investigated by a pin-on-disk test. The penetration depth decreased as the scan rate increased as a consequence of the shorter interaction time. The depth/height ratio of the deposited layer decreased with an increase in the scan rate. The depth/width ratio increased as laser power increased and the scan rate decreased. The deposition shape of the Fe-Ni powder was relatively shallow and wide compared with that of the Fe-Cr powder. The scan rate had a substantial effect upon the deposition height, with the Fe-Cr powder melting more than the Fe-Ni powder. The micro-hardness of the layer melted from the powders is higher than that of the substrate, and the hardness of the laser-surface-melted layer without any metal powder is higher compared to that of the metal-powder-melted layer. The direct laser melting process with Fe-Ni powder represents a superior method when restoring a steel die when the bead shape and hardness of the restored surface are important outcome considerations.

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“…The heating characteristics of lasers have been employed in many forming, sintering and melting processes as utilized in additive layer manufacturing (ALM). Physical processes including welding, hardening, alloying, cladding and bending can be effected by laser irradiation [1,2]. These laser processes are associated with characteristic thermal cycles in small, highly localized regions on the surface of a workpiece.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to non-linearities introduced by temperature dependent properties, the laser scanning movement adds asymmetry to the problem; hence there is need for three-dimensional modelling. Chiang and Chen [1] studied the changes in microstructure with depth of H13 steel as a result of the laser melting of its surface. Selvan et al [5] carried out experimental and analytical studies on CO 2 -laser treated En18 (medium carbon steel) and showed that quenching occurred at the scanned surface which resulted in a local increase in the hardness to about 950HV at the surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Studies on the Laser Melting of Steel Plate Surfaces

Roberts

Wang

Kibble

et al. 2010

Proceedings of the 36th International MATADOR Conference

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Abstract. The direct impingement of laser on the surface of a platform occurs during additive layer manufacturing especially for the first layer of powder coating. As a result, thermal stresses develop due to high temperature gradients in a thin layer of the plate surface, which can result in undesired surface deformation of the steel platform used. This study investigates the residual stress profiles on a hot-rolled AISI 1015 steel plate produced by direct laser application. A three-dimensional finite element simulation model is developed which considers the laser heating process as a sequentially coupled thermal elasto-plastic problem. Experiments using optical laser scanning microscopy to obtain surface topography of the melted surface are also presented showing reasonable agreement with the simulation results. The influence of the plate thickness on the stress-depth distribution is presented.

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Laser surface hardening of H13 steel in the melt case

Cited by 70 publications

References 8 publications

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

Application of direct laser melting to restore damaged steel dies

Numerical and Experimental Studies on the Laser Melting of Steel Plate Surfaces

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