研究目的
Investigating the effects of Nd:YAG laser parameters on the surface hardening process of AISI 4130 steel, including the influence of laser focal point position, laser pulse width, and laser scanning speed on the microstructure and micro-hardness distribution.
研究成果
The study demonstrated that laser surface transformation hardening of AISI 4130 steel using a Nd:YAG pulsed laser significantly improves surface hardness and depth of the hardened layer. The finite element model accurately predicted the temperature profile and the size and shape of the hardened region, validating its use for simulating the LSTH process.
研究不足
The study is limited to the effects of specific laser parameters on the surface hardening of AISI 4130 steel. The applicability of the findings to other materials or under different conditions is not explored. The FEM model's accuracy is dependent on the calibration and validation against experimental data.
1：Experimental Design and Method Selection:
The study utilized a pulsed Nd:YAG laser for surface hardening, varying parameters such as laser focal height, pulse width, scanning speed, and power. The microstructure was analyzed using optical microscopy and field emission scanning electron microscopy, and micro-hardness was measured in both width and depth directions.
2：Sample Selection and Data Sources:
Samples of AISI 4130 steel with 65 mm diameter and 10 mm thickness were prepared for laser surface and furnace hardening. The chemical composition was determined using X-ray fluorescence.
3：List of Experimental Equipment and Materials:
A 400 W average laser power pulsed Nd:YAG laser (model IQL-10), LA300W-LP joule meter, 5000W-LP Ophir joule meter, Leica MEF 4A optical microscopy, and a micro hardness V-test-analog tester were used.
4：Experimental Procedures and Operational Workflow:
The laser treatment was performed with varying parameters, followed by sectioning, metallographic preparation, and etching. Microstructure analysis and micro-hardness testing were conducted.
5：Data Analysis Methods:
The geometry features of the hardened case were measured using ImageJ software, and the percentage of the ferrite phase was measured by Celemex software. Micro-hardness profiles were plotted and analyzed.
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