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Response of Second Phase Particles in Ti-V-Nb Microalloyed Steel During Weld Thermal Cycles |
CHEN Maoai; WU Chuansong; YANG Min;TANG Yimin; WU Renjie |
Key Laboratory of Liquid Structure and Heredity of Materials; Ministry of Education; Shandong University; Jinan 250061;College of Materials Science and Engineering; Shanghai Jiaotong |
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Cite this article:
CHEN Maoai; WU Chuansong; YANG Min; TANG Yimin; WU Renjie. Response of Second Phase Particles in Ti-V-Nb Microalloyed Steel During Weld Thermal Cycles. Acta Metall Sin, 2004, 40(2): 148-154 .
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Abstract By using carbon extraction replica technology and welding thermal
simulation, the second phase particles in parent
metal, weld metal and simulated coarse grain heat affected zone (CGHAZ)
of Ti-V-Nb microalloyed steel were investigated. Experiment results
and analysis show that the particle sizes in the steel are less than 100 nm,
and the relative content of Ti in particles increases with
increasing particle size. During welding, most of carbonitride particles
in welding pool dissolved, the dissolved Ti takes part in deoxidation
reaction producing TiO, TiO combined with the other deoxidation or
desulfuration products to form large inclusion, dissolved Nb and V
did not re-precipitated. TiO and MnAl2O4 formed at the
surface of inclusions have cubic coherent relationship. A large
quantity of carbonitride particles remained in CGHAZ after welding
thermal cycle, the shape of particles changed from irregular shape
to cubic one, the mean particle size increased and all of these
particles are rich in Ti.
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Received: 24 February 2003
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