Microstructural and mechanical aspects of tempered ICCGHAZ of SQV-2A Iow alloy steel weld.
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概要
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Effect of simulated welding cycles consisting of austenitizing at 1623K/6s and cooling for Δ<I>t8/5</I>=6s (the 1st cycle), reheating at 873-1123K/6s and cooling for Δ<I>t8/5eff</I>=6 or 40s (the 2nd one), and annealing at 473-893K/6s and cooling for Δ<I>t8/5eff</I>=6s (the 3rd one) on the evolution of microstructure and changes in absorbed energy (Charpy test at 293K) of SQV-2A low alloy steel was investigated. Light microscopy, TEM, electron diffraction, SEM, EDX, and measurement of hardness HV10 were used to characterize the microstructure of the steel including type of observed phases and morphology of fracture surfaces. The formation of M-A constituent and its internal evolution during 2nd and 3rd welding cycles (i.e. precipitation and growth of carbide particles) as well as the morphology of intragranular interlath M-A islands were found to be responsible for changes in absorbed energy. The role of M3C and M2C carbides in influencing the absorbed energy seems to be more significant than suggested earlier.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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