研究目的
Investigating the effect of carbon (C) on microstructures and properties of fusion zone (FZ) of laser beam welding (LBW) joints of molybdenum (Mo) alloy with serious grain boundary embrittlement.
研究成果
The tensile strength of Mo weld joints treated through solid carburizing increased significantly, and the fracture mode transformed from complete intergranular fracture to mixed-mode fracture. The study concludes that carburization reduces MoO2 particles on the grain boundary, generates spherical Mo2C particles, and improves the compatibility of deformation at grain boundary and grain interior, leading to enhanced mechanical performance.
研究不足
The study is limited to the effects of solid carburizing on molybdenum alloy weld joints under specific conditions. The generalizability of the findings to other materials or carburizing methods is not explored.
1：Experimental Design and Method Selection:
The study involved laser beam welding (LBW) of molybdenum alloy plates followed by solid carburizing (SC) under various conditions to explore the effect of carbon on the microstructure and properties of the welded joints.
2：Sample Selection and Data Sources:
Nano-lanthanum oxide (La2O3) dispersion-strengthened Mo alloy plates were used. The samples were subjected to LBW and then carburized at 1200°C for different durations.
3：List of Experimental Equipment and Materials:
Equipment included an IPG YLS-4000 fiber laser, Instron 1195 tensile testing machine, Thermo Fisher ESCALAB Xi+ X-ray photoelectron spectrometer (XPS), JXA8100 electron probe micro-analyzer (EPMA), and JEM-2100Plus high-resolution scanning-transmission electron microscope (STEM).
4：Experimental Procedures and Operational Workflow:
The Mo alloy plates were welded using LBW, then carburized or annealed. Mechanical testing and microstructure analysis were conducted to evaluate the effects of carburizing.
5：Data Analysis Methods:
The analysis included tensile testing, hardness testing, XPS, EPMA, and TEM to assess the mechanical properties and microstructure changes.
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JEM-2100Plus high-resolution scanning-transmission electron microscope
JEM-2100Plus
JEOL
Used to analyse the precipitated phase under an accelerating voltage of 200 kV.
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IPG YLS-4000 fiber laser
YLS-4000
IPG
Used for laser beam welding of molybdenum alloy plates.
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Thermo Fisher ESCALAB Xi+ X-ray photoelectron spectrometer
ESCALAB Xi+
Thermo Fisher
Used for analyzing the chemical valences of elements on the grain-boundary surface and the cross section of FZ.
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JXA8100 electron probe micro-analyzer
JXA8100
JEOL
Used to determine the contents of C, O, N, Mo in the FZ.
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Instron 1195 tensile testing machine
1195
Instron
Used for tensile testing of weld joints.
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