Effects of laser hardening process parameters on hardness depth of Ck45 steel using Taguchi’s optimization technique

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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Optimization of Laser Hardening Process Parameters for Cast Iron Using a Design of Experiment Method

Lecture Notes in Mechanical Engineering - Advances in Mechanical Processing and Design ◽

10.1007/978-981-15-7779-6_25 ◽

2020 ◽

pp. 293-304

Author(s):

Santoshkumar V. Wagh ◽

Dhananjay V. Bhatt ◽

Jyoti V. Menghani ◽

Sujit S. Pardeshi

Keyword(s):

Cast Iron ◽

Process Parameters ◽

Design Of Experiment ◽

Laser Hardening ◽

Hardening Process ◽

Experiment Method

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Laser Hardening Process Parameters

Optoelektronik in der Technik / Optoelectronics in Engineering ◽

10.1007/978-3-642-82121-9_55 ◽

1984 ◽

pp. 312-316

Author(s):

K. Wissenbach ◽

L. Bakowsky ◽

H.-G. Treusch ◽

G. Herziger

Keyword(s):

Process Parameters ◽

Laser Hardening ◽

Hardening Process

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

Coatings ◽

10.3390/coatings10040342 ◽

2020 ◽

Vol 10 (4) ◽

pp. 342 ◽

Cited By ~ 2

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.

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Time-dependent 3D modeling of the thermal analysis of the high-power diode laser hardening process

Optics & Laser Technology ◽

10.1016/j.optlastec.2020.106216 ◽

2020 ◽

Vol 128 ◽

pp. 106216 ◽

Cited By ~ 1

Author(s):

Saeed Talesh Alikhani ◽

Mohammad Kazemi Zahabi ◽

Mohammad Javad Torkamany ◽

Seyed Hasan Nabavi

Keyword(s):

Thermal Analysis ◽

Diode Laser ◽

High Power ◽

3D Modeling ◽

Laser Hardening ◽

Time Dependent ◽

Hardening Process ◽

Power Diode ◽

High Power Diode Laser

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

ASME 2009 International Manufacturing Science and Engineering Conference, Volume 2 ◽

10.1115/msec2009-84093 ◽

2009 ◽

Cited By ~ 3

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.

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