Apparent spot in circular laser hardening: effect of process parameters

2010 ◽  
Vol 3 (S1) ◽  
pp. 1119-1122 ◽  
Author(s):  
L. Giorleo ◽  
A. Liu ◽  
B. Previtali
Keyword(s):  
Process Parameters ◽  
Laser Hardening ◽  
Hardening Effect

A New Computationally Efficient Model for Tempering in Multi-Tracks Laser Hardening

2009 ◽  
Author(s):  
Alessandro Fortunato ◽  
Leonardo Orazi ◽  
Giovanni Tani
Keyword(s):  
Process Parameters ◽  
Laser Power ◽  
Laser Scanning ◽  
Original Model ◽  
Laser Hardening ◽  
Computationally Efficient ◽  
Laser Process ◽  
Treat All ◽  
Tempering Time ◽  
Experimental Comparisons

The bottleneck in laser hardening principally occurs when large surfaces have to be treated because this process situation leads to multi-tracks laser scanning in order to treat all the component surface. Unfortunately, multi-tracks laser trajectories generate an unwanted tempering effect that depends on the overlapping of two close trajectories. To reduce the softening effects, a simulator capable to optimize the process parameters such as laser power and speed, number and types of trajectories, could sensibly increase the applicability of the process. In this paper an original model for the tempering is presented. By introducing a tempering time factor for the martensitic transformation, the hardness reduction can be predicted according to any laser process parameters, material and geometry. Experimental comparisons will be presented to prove the accuracy of the model.

scholarly journals Experimental investigation and effects of laser hardening process parameters on microhardness of En24 steel

2020 ◽  
Vol 814 ◽  
pp. 012003
Author(s):  
Santoshkumar V. Wagh ◽  
Dhananjay V. Bhatt ◽  
Jyoti V. Menghani ◽  
Sujit S. Pardeshi ◽  
Bhagyesh B. Deshmukh
Keyword(s):  
Experimental Investigation ◽  
Process Parameters ◽  
Laser Hardening ◽  
Hardening Process

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

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1016
Author(s):  
Nikolaj Mole ◽  
Marko Bojinović ◽  
Pino Koc ◽  
Boris Štok
Keyword(s):  
Computer Simulation ◽  
Phase Transformation ◽  
Numerical Model ◽  
Heating Rate ◽  
Process Parameters ◽  
Laser Hardening ◽  
Eutectoid Steel ◽  
Hardening Process ◽  
3D Geometry ◽  
Kinetics Of

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.

A New Computationally Efficient Model for Tempering in Multitrack Laser Hardening in Medium Carbon Steels

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Alessandro Fortunato ◽  
Leonardo Orazi ◽  
Giovanni Tani
Keyword(s):  
Process Parameters ◽  
Laser Scanning ◽  
Carbon Steels ◽  
Laser Hardening ◽  
Computationally Efficient ◽  
Medium Carbon ◽  
Medium Carbon Steels ◽  
Treat All ◽  
Tempering Time ◽  
Experimental Comparisons

The bottleneck in laser hardening principally occurs when large surfaces have to be treated because this process situation leads to multitrack laser scanning in order to treat all the component surfaces. Unfortunately, multitrack laser trajectories generate an unwanted tempering effect that depends on the overlapping of two close trajectories. To reduce the softening effects, a simulator capable to optimize the process parameters, such as laser power and speed and number and types of trajectories, could sensibly increase the applicability of the process. In this paper, an original model for the tempering is presented. By introducing a tempering time factor for the martensitic transformation, the hardness reduction can be predicted according to any laser process parameters, material, and geometry. Experimental comparisons will be presented to prove the accuracy of the model.

Laser Hardening Process Parameters

1984 ◽  
pp. 312-316
Author(s):  
K. Wissenbach ◽  
L. Bakowsky ◽  
H.-G. Treusch ◽  
G. Herziger
Keyword(s):  
Process Parameters ◽  
Laser Hardening ◽  
Hardening Process

scholarly journals Effects of Laser Hardening Process Parameters on Hardness Profile of 4340 Steel Spline—An Experimental Approach

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 342 ◽  
Author(s):  
Noureddine Barka ◽  
Sasan Sattarpanah Karganroudi ◽  
Rachid Fakir ◽  
Patrick Thibeault ◽  
Vincent Blériot Feujofack Kemda
Keyword(s):  
Process Parameters ◽  
Experimental Tests ◽  
Case Depth ◽  
Laser Hardening ◽  
Hardness Profile ◽  
Hardening Process ◽  
4340 Steel ◽  
Specific Geometry ◽  
Geometrical Factors ◽  
Splined Shaft

This study displays the effect of laser surface hardening parameters on the hardness profile (case depth) of a splined shaft made of AISI 4340 steel. The approach is mainly based on experimental tests wherein the hardness profile of laser hardened splines is acquired using micro-hardness measurements. These results are then evaluated with statistical analysis (ANOVA) to determine the principal effect and the contributions of each parameter in the laser hardening process. Using empirical correlations, the case depth of splined shaft at tip and root of spline’s teeth is also estimated and verified with measured data. The obtained results were then used to study the sensitivity of the measured case depths according to the evolution of laser process parameters and geometrical factors. The feasibility and efficiency of the proposed approach lead to a reliable statistical model in which the hardness profile of the spline is estimated with respect to its specific geometry.

scholarly journals ANN Laser Hardening Quality Modeling Using Geometrical and Punctual Characterizing Approaches

2018 ◽  
Author(s):  
Ilyes Maamri ◽  
Noureddine Barka ◽  
Abderrazak El Ouafi
Keyword(s):  
Process Parameters ◽  
Laser Power ◽  
Mechanical Performance ◽  
Scanning Speed ◽  
Laser Hardening ◽  
Treatment Quality ◽  
Hardness Profile ◽  
Geometrical Approach ◽  
The Core ◽  
Initial Hardness

Maximum hardness and hardened depth are the responses of interest in relation to the laser hardening process. These values define heat treatment quality and have a direct impact on mechanical performance. This paper aims to develop models capable of predicting the shape of the hardness profile depending on laser process parameters for controlling laser hardening quality (LHQ), or rather the response values. An experimental study was conducted to highlight hardened profile sensitivity to process input parameters such as laser power (PL), beam scanning speed (VS) and initial hardness in the core (HC). LHQ modeling was conducted by modeling attributes extracted from the hardness profile curve using two effective techniques based on the punctual and geometrical approaches. The process parameters with the most influence on the responses were laser power, beam velocity and initial hardness in the core. The obtained results demonstrate that the geometrical approach is more accurate and credible than the punctual approach according to performance assessment criteria.

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