Study on Laser Surface Hardening Behavior of 42CrMo Press Brake Die

Laser surface hardening is a promising surface technology to enhance the properties of surfaces. This technology was used on the 42CrMo press brake die. Its hardening behavior was investigated by using scanning electron microscopy and electron backscattering diffraction. The results indicated that the martensite in the hardening zone was significantly finer than that in the substrate. There were many low-angle grain boundaries in the martensite of the hardening zone, and the kernel average misorientation and grain orientation spread in the hardening zone grains were obviously greater, which further improved the hardness of the hardening zone, especially near the substrate. The microstructure and the properties of the blade maintained excellent uniformity with treatment by single-pass laser surface hardening with a spot size of 2 mm, scanning speed of 1800 mm/min, and power of 2200 W. The hardness of the hardening zone was 1.6 times higher than that of the base material, and the thickness of the hardening zone reached 1.05 mm.

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Analysis of Laser Surface Hardening of GM246 Cast Iron

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1035.596 ◽

2021 ◽

Vol 1035 ◽

pp. 596-601

Author(s):

Hui Zhen Wang ◽

Yue Wen Zhai ◽

Le Yu Zhou ◽

Zi Bo Zhang ◽

Gang Yang ◽

...

Keyword(s):

Cast Iron ◽

Power Density ◽

Surface Hardening ◽

Scanning Speed ◽

Industrial Applications ◽

Laser Surface ◽

Superior Performance ◽

Laser Surface Modification ◽

Advanced Technologies ◽

Laser Surface Hardening

Laser surface modification technology is one of the most advanced technologies, which uses laser to modify the characteristics of the surface to offer superior performance for various industrial applications. In this study, laser surface hardening behavior of GM246 case iron was investigated. Result shows that excellent laser surface hardening of GM246 cast iron need low power density and scanning speed. With power of 2500 W, scanning speed of 300 mm/min and power density of 2500 W/cm2, the laser surface hardening of GM246 cast iron achieved the hardness of 790HV, which was 2-3 times higher than the hardness of base metal. Also, the depth of laser surface hardening case achieved 0.9 mm and the hardening case demonstrated three subzones.

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Experimental investigation on a novel approach for laser surface hardening modelling

International Journal of Mechanical and Materials Engineering ◽

10.1186/s40712-020-00124-0 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

L. Orazi ◽

A. Rota ◽

B. Reggiani

Keyword(s):

Surface Hardening ◽

Carbon Diffusion ◽

Industrial Applications ◽

Laser Surface ◽

Simplified Approach ◽

Laser Surface Hardening ◽

Novel Approach ◽

Laser Treatments ◽

High Flexibility ◽

Short Time

AbstractLaser surface hardening is rapidly growing in industrial applications due to its high flexibility, accuracy, cleanness and energy efficiency. However, the experimental process optimization can be a tricky task due to the number of involved parameters, thus suggesting for alternative approaches such as reliable numerical simulations. Conventional laser hardening models compute the achieved hardness on the basis of microstructure predictions due to carbon diffusion during the process heat thermal cycle. Nevertheless, this approach is very time consuming and not allows to simulate real complex products during laser treatments. To overcome this limitation, a novel simplified approach for laser surface hardening modelling is presented and discussed. The basic assumption consists in neglecting the austenite homogenization due to the short time and the insufficient carbon diffusion during the heating phase of the process. In the present work, this assumption is experimentally verified through nano-hardness measurements on C45 carbon steel samples both laser and oven treated by means of atomic force microscopy (AFM) technique.

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Laser surface hardening of SS316L

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1070/1/012107 ◽

2021 ◽

Vol 1070 (1) ◽

pp. 012107

Author(s):

Ganesh Dongre ◽

Avadhoot Rajurkar ◽

Ramesh Gondil ◽

Nandan Jaju

Keyword(s):

Surface Hardening ◽

Laser Surface ◽

Laser Surface Hardening

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Laser Surface Hardening of Gray Cast Iron Used for Piston Ring

CrossRef Listing of Deleted DOIs ◽

10.1361/105994902770344105 ◽

2002 ◽

Vol 11 (3) ◽

pp. 294-300 ◽

Cited By ~ 19

Author(s):

Jong-Hyun Hwang ◽

Yun-Sig Lee ◽

Dae-Young Kim ◽

Joong-Geun Youn

Keyword(s):

Cast Iron ◽

Surface Hardening ◽

Piston Ring ◽

Gray Cast Iron ◽

Laser Surface ◽

Gray Cast ◽

Laser Surface Hardening

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Water-Jet Assisted Laser Surface Hardening of Medium Carbon Steel Using Fiber Laser

Volume 4: Processes ◽

10.1115/msec2018-6457 ◽

2018 ◽

Author(s):

Sagar Sarkar ◽

Ashish Kumar Nath

Keyword(s):

Surface Hardening ◽

High Hardness ◽

Medium Carbon Steel ◽

Water Jet ◽

Laser Surface ◽

Peak Hardness ◽

Bottom Surface ◽

Thin Sheets ◽

Laser Surface Hardening ◽

Conventional Laser

Laser surface hardening of most of the industrial components require depth of surface modification in the range of 100–150 micron. Conventional laser surface hardening uses laser as a heat source to modify a particular area of the surface without melting in an inert gas environment. However, the hardened profile in this case shows peak hardness value at a certain depth from the top surface. Also, hardening the top surface to get relatively much higher hardness near the top surface in case of thin sheets becomes difficult due to accumulation of heat below the surface of the specimen which in turn lowers the cooling rate. Hence, self-quenching becomes inadequate. In the present study, an in-house fabricated laser processing head with coaxial water nozzle has been used to flow a laminar water-jet during the laser surface hardening process to induce forced convection at the top surface. Thus, heat gets carried away by the water-jet from the top surface and by the water from the bottom surface as well. Results show that with judicious selection of process parameters, it is possible to get higher hardness (800 HV) to that of conventional laser surface hardening (500 HV) at the top surface using this process. Present process can be used for those cases where high hardness values are required near the top surface specially for thin sheets and thermally sensitive materials.

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