研究目的
To analyze and compare the mechanical properties such as microhardness, tensile strength, and corrosion properties between weld and PWHT samples of NiTinol shape memory alloy.
研究成果
Laser PWHT significantly affected the phase transformation temperatures, microhardness, tensile strength, and corrosion behavior of welded NiTinol joints. The laser power source is recommended for PWHT as it resulted in better properties and increased productivity by avoiding longer soaking times.
研究不足
The study focused on the effects of laser PWHT on NiTinol welded samples, but the comparison with traditional furnace-based PWHT methods was not explored. The study also did not investigate the long-term stability of the properties post-PWHT.
1：Experimental Design and Method Selection:
The study involved laser welding of NiTinol sheets followed by post weld heat treatment using a laser power source. The quality of the weld was assessed based on phase transformation temperatures, microhardness, tensile strength, and corrosion resistance.
2：Sample Selection and Data Sources:
1 mm thick NiTinol sheets were used as the base material. The chemical composition of the base metal was provided.
3：List of Experimental Equipment and Materials:
Equipment included a 6-Axis KUKA Robot Yb: YAG laser welding setup, Lee make Nd: YAG laser for PWHT, Welding Expert System, SEM model Hitachi S-3000 H, Rigaku Ultima III X-ray diffractometer, Mettler Toledo DSC 822e, Wilson Microhardness tester, and Tinius Olsen tensile test machine.
4：Experimental Procedures and Operational Workflow:
NiTinol sheets were welded in butt joint position using laser welding in continuous mode. PWHT was performed using laser in pulsed mode. Microstructural analysis, DSC analysis, mechanical properties measurement, and potentiodynamic polarization tests were conducted.
5：Data Analysis Methods:
The data were analyzed to assess the effects of PWHT on the phase transformation temperatures, microhardness, tensile strength, and corrosion behavior of the welded NiTinol joints.
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X-ray diffractometer
Rigaku Ultima III
Rigaku
Used to determine the various phases present in the weld and PWHT samples.
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Scanning electron microscope
Hitachi S-3000 H
Hitachi
Used to study the microstructural features of the weld.
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Yb: YAG laser welding setup
6-Axis KUKA Robot
KUKA
Used for welding NiTinol sheets in butt joint position.
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Nd: YAG laser
Lee
Used for post weld heat treatment in pulsed mode.
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Welding Expert System
Struers
Used to capture the macrostructure of the weld.
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Differential scanning calorimetry
Mettler Toledo DSC 822e
Mettler Toledo
Used to identify the phase transformation temperatures of the weld and PWHT samples.
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Microhardness tester
VICKERS 402 MVD
Wilson
Used to carry out microhardness measurement.
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Tensile test machine
Tinius Olsen
Used for tensile strength measurement.
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Electrochemical workstation
IVIUM
IVIUM
Used for potentiodynamic polarization test.
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