Modeling of Laser Surface Hardening

Grum, Janez

doi:10.1201/9781420003581.ch11

Cited by 3 publications

(4 citation statements)

References 51 publications

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“…the austenitisation temperatures Ac 1 and Ac 3 at a constant heating rate is well known as the time -temperature -austenitisation (TTA) diagram.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Laser hardening enables treatment of different types of steel because there is a wide range of technological parameters available [1]. Directly related to the given laser source are the laser type and its wavelength, nominal power and the power density distribution of the laser beam.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…For hypo-eutectoid steels containing less than 0.8 wt% C, the volume fractions under question are calculated using the lever rule method [1]:…”

Section: Phase Transformation Model -Heatingmentioning

confidence: 99%

See 2 more Smart Citations

A computer simulation study of the effects of temperature change rate on austenite kinetics in laser hardening

Bojinović

Mole

Štok

2015

Surface and Coatings Technology

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“…the austenitisation temperatures Ac 1 and Ac 3 at a constant heating rate is well known as the time -temperature -austenitisation (TTA) diagram.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

A computer simulation study of the effects of temperature change rate on austenite kinetics in laser hardening

Bojinović

Mole

Štok

2015

Surface and Coatings Technology

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“…The effects of changing some essential laser heat-treating parameters, such as the maximum surface temperature, the interaction time of the laser beam or the laser beam power, can be expressed as general technological maps, such as in the ASM International Handbook Committee [5] or the papers of Grum [6] or Hyungson and Sangwoo [7]. Grum [6] summarized a wide range of different influences on the process of laser surface hardening and presented the influence of different coatings and prior surface mechanical treatments on the absorptivity of the laser beam power, influence of constant heating rate on austenitization temperature Ac 3 , influence of laser power and laser speed on depth of surface hardened area and residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Effects of Prior Microstructure and Heating Rate on the Depth of Increased Hardness in Laser Hardening: Comparison of Computer Simulation and Experimental Results

Mole

Bojinović²,

Koc

et al. 2018

Metals

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The response of the hypo-eutectoid steel to laser hardening, which is measured as the depth of the increased hardness, depends not only on the set of the process parameters but also on the prior microstructure of the workpiece. The multiple preliminary stages of the treatment of the workpiece in the industrial conditions are commonly not completely known, resulting in an unclear prior microstructure of the workpiece. To model the response of the hypo-eutectoid steel, a validated numerical model for laser hardening has been used in the computer simulation of the process for four different cases. The numerical model takes into account the 3D geometry of the workpiece, its prior microstructure, and the effect of the heating rate during the laser hardening process on the kinetics of the phase transformation. The four cases were designed to take into account two different sets of process parameters and two different prior microstructures of the workpiece. The output of the computer simulation was verified experimentally.

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Research on the Optimization of Oscillation for the Joint Quality of Laser Welded Joints in Automobile Seat Frames

Shin,

Kim,

Jang

et al. 2024

J Weld Join

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The increasing adoption of high-strength steel in automotive manufacturing has made laser welding a preferred technique due to its ability to reduce thermal deformation and facilitate single-sided welding. Despite these advantages, challenges persist, particularly in achieving precise welds at the edges of seat frame assemblies. This study explores the application of laser weaving techniques to improve joint strength and penetration depth. The critical variables evaluated include defocusing distance and weaving parameters, which were assessed for their impact on penetration depth, effective joint width, and edge weld quality in a three-sheet stack of dual-phase (DP) steel. Results indicate that increasing the defocusing distance from 5 mm to 20 mm at a fixed oscillation frequency of 20 Hz leads to a corresponding increase in surface bead width. A significant correlation was found between the effective joint width and maximum tensile shear strength, with the highest strength of 34.6 kN observed at an 8 mm defocusing distance. Additionally, the use of oscillation in the welding process improved tensile shear strength by approximately 9 kN compared to line welding without oscillation. Oscillation also enhanced microstructural properties, demonstrating that optimal welding conditions can be achieved even with off-position welding. These improvements are attributed to minimized heat-affected zone (HAZ) effects, which contributed to increased joint strength and hardness.

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Modeling of Laser Surface Hardening

Cited by 3 publications

References 51 publications

A computer simulation study of the effects of temperature change rate on austenite kinetics in laser hardening

A computer simulation study of the effects of temperature change rate on austenite kinetics in laser hardening

Effects of Prior Microstructure and Heating Rate on the Depth of Increased Hardness in Laser Hardening: Comparison of Computer Simulation and Experimental Results

Research on the Optimization of Oscillation for the Joint Quality of Laser Welded Joints in Automobile Seat Frames

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