研究目的
The effect of a laser tempering process, subsequent to a laser hardening treatment, on the microstructure, microhardness, structural composition of phases and residual stresses of a 42CrMo4 steel has been studied.
研究成果
The laser tempering treatment transforms the martensite hardened phase into a tempered martensite one, being a complementary and effective method to adjust, through the selection of the appropriate values of power density and interaction time, the desired degree of hardness as well as tensional state of a processed area, in order to meet the requirements demanded in a given component.
研究不足
The study focuses on the laser tempering process of a previously surface hardened 42CrMo4 steel, and the results may not be directly applicable to other materials or tempering processes.
1：Experimental Design and Method Selection:
The study involved a laser tempering process subsequent to a laser hardening treatment on 42CrMo4 steel, using a 10 kW diode laser and a galvanometer scanner head.
2：Sample Selection and Data Sources:
A cylindrical bar of 42CrMo4 steel, previously turned and normalized, was used.
3：List of Experimental Equipment and Materials:
A continuous wave 10 kW high power diode laser, a 1 mm circular fibre optic, collimating and focusing optics, a two-dimensional scanning head, a 6-axis robot, and an indexing table were used.
4：Experimental Procedures and Operational Workflow:
The study involved a battery of individual laser track tests, with a hardening stage followed by a tempering stage, varying the average power density.
5：Data Analysis Methods:
The geometry, grain size, and microstructure of the processed areas were characterized by optical and scanning electron microscopy. Microhardness measurements and X-ray diffraction scans were performed.
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