Laser Hardening of Austempered Ductile Cast Iron (ADI)∗

Putatunda, Susil K.; Bartosiewicz, L.; Hull, Robert J.; Lander, Michael L.

doi:10.1080/10426919708935127

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…Furthermore, LSM produced more compressive residual stresses and enhanced significantly the wear resistance of the austempered ductile iron [19]. Putatunda [27], who applied laser hardening techniques, carried out an investigation on ADI. They used manganese phosphate coatings and colloidal graphite to achieve more uniform hardness.…”

Section: Microstructure and Typical Hardnessmentioning

confidence: 99%

Microcracks Reduction in Laser Hardened Layers of Ductile Iron

Hurtado-Delgado¹,

Huerta-Larumbe²,

Pérez³

et al. 2021

Coatings

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A study of surface hardening of Ductile Iron (DI) with and without austempering heat treatment was developed. The chemical composition of the material contains alloying elements such as Cu and Ni, that allow to obtain a Ductile Iron Grade 120-90-02, based on ASTM A536, which was heat treated to be transformed to Austempered Ductile Iron (ADI). Specimens of 10 × 10 × 5 mm3 were obtained for application of surface hardening by Nd:YAG UR laser of 150 W maximum power. The parameters used were advance speed of 0.2 and 0.3 mm/s and power at 105, 120, 135 and 144 W; the departure microstructures were fully pearlitic in the samples without heat treatment, and ausferrite for austempered samples. Microstructural characterization of hardened samples was performed were analyzed and martensite and undissolved carbides were identified in the pearlitic samples, while in ausferrite samples it was found finer martensite without carbides. The depth of hardened surface to different conditions and their respective microhardness were measured. The results indicate that the surface hardening via laser is a suitable method for improving wear resistance by means of hardness increment in critical areas without compromising the core ductility of DI components, but the surface ductility is enhanced when the DI is austempered before the laser hardening, by the reduction of surface microcracks.

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Section: Microstructure and Typical Hardnessmentioning

confidence: 99%

Microcracks Reduction in Laser Hardened Layers of Ductile Iron

Hurtado-Delgado¹,

Huerta-Larumbe²,

Pérez³

et al. 2021

Coatings

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“…Laser surface treatment methods have been intensively employed for the past three decades for the enhancement of surface properties of different cast iron grades [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Much research has been devoted to improving the tribological properties of cast irons via a laser surface transformation hardening (LSTH) process [ 10 , 11 , 12 , 14 , 15 , 16 , 17 , 18 ]. In contrast to conventional surface hardening processes such as induction and flame hardening, LSTH ensures excellent surface finish and very low distortion of the workpiece.…”

Section: Introductionmentioning

confidence: 99%

“…Laser surface treatment methods have been intensively employed for the past three decades for the enhancement of surface properties of different cast iron grades [1][2][3][4][5][6][7][8][9][10][11][12][13]. Much research has been devoted to improving the tribological properties of cast irons via a laser surface transformation hardening (LSTH) process [10][11][12][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

High-Power Diode Laser Surface Transformation Hardening of Ferrous Alloys

et al. 2022

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A high-power direct diode laser (HPDDL) having a rectangular beam with a top-hat intensity distribution was used to produce surface-hardened layers on a ferrous alloy. The thermal conditions in the hardened zone were estimated by using numerical simulations and infrared (IR) thermography and then referred to the thickness and microstructure of the hardened layers. The microstructural characteristics of the hardened layers were investigated using optical, scanning electron and transmission electron microscopy together with X-ray diffraction. It was found that the major factor that controls the thickness of the hardened layer is laser power density, which determines the optimal range of the traverse speed, and in consequence the temperature distribution in the hardened zone. The increase in the cooling rate led to the suppression of the martensitic transformation and a decrease in the hardened layer hardness. The precipitation of the nanometric plate-like and spherical cementite was observed throughout the hardened layer.

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“…Using the laser for intensive surface heating is known for more than 50 years. The increase of the power in laser beam, the application of laser optics with a possibility to spread the beam from millimeters to tens of millimeters, automatized positioning, the real time control of both power and temperature at incident area are benefits which make this method more universally and progressively used for surface hardening of Fe alloys [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Laser Surface Hardening of Graphite Cast Iron

Horník

Krčil

Mára

et al. 2022

SSP

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Two types of graphite cast iron are evaluated. The effect of laser surface hardening is compared using metallographic analysis of the microstructure and measurement of hardness profile. Conditions of the hardening were the same for both analyzed materials. The alloys that were compared are: cast iron with lamellar graphite EN GJL-200 and cast iron with nodular graphite EN GJS-700 CuNi. Microstructure of tested cast irons was pearlitic-ferritic. Laser surface heat treatment caused formation of martensitic layer. The depth and structural compositions of hardened layers do differ. In the case of gray cast iron the higher hardened depth was achieved and in the case of ductile cast iron the higher hardness was observed.

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Laser Hardening of Austempered Ductile Cast Iron (ADI)∗

Cited by 11 publications

References 2 publications

Microcracks Reduction in Laser Hardened Layers of Ductile Iron

Microcracks Reduction in Laser Hardened Layers of Ductile Iron

High-Power Diode Laser Surface Transformation Hardening of Ferrous Alloys

Laser Surface Hardening of Graphite Cast Iron

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