研究目的
To study the pulsed Nd:YAG laser welding of austenitic stainless steel and super austenitic stainless steel, focusing on the mechanical and microstructural characterization of the similar welded joints of 304L and 904L steels.
研究成果
The study concludes that at the same laser process parameters, the weld bead shape differs between 304L (V shaped) and 904L (H shaped) due to differences in thermophysical properties. The fusion zone microstructure and mechanical properties such as microhardness and ductility also vary between the two materials, with 304L showing higher ductility.
研究不足
The study is limited to similar pulsed Nd:YAG laser welding of 304L and 904L stainless steel under specific process parameters. The effects of varying process parameters on weld quality and properties are not explored.
1：Experimental Design and Method Selection:
Pulsed Nd:YAG laser beam welding of similar butt joint configuration of thin sheets of austenitic stainless steel (304L) and super stainless steel (904L) of
2：4 mm thickness. Sample Selection and Data Sources:
Chemical composition of the parent materials (304L & 904L) provided.
3：List of Experimental Equipment and Materials:
Pulsed Nd:YAG laser system, wire EDM, bakelite for mounting, emery paper, cloth polishing with abrasive of
4：03 microns, glyceregia for etching. Experimental Procedures and Operational Workflow:
Welding at 5 mm/s scanning speed, 25 Hz pulse frequency, and
5：75 mm laser spot diameter. Specimens cut with wire EDM, mounted, polished, and etched for microstructure examination. Data Analysis Methods:
Microstructure images examined under optical microscope, mechanical properties measured with vickers microhardness machine and tensile testing.
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