鋼材の高温割れ感受性に関する一考察 : Trans-Varestraint試験について

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Hot cracking frequently occurs in weld metals during fabrication process in shipyard production. In order to find preventive ways for hot cracking, it is necessary to assess hot cracking susceptibility of the weld metals quantitatively. At first, formation of hot cracking during TIG bead-on plate welding is examined with the Trans-Varestraint test. A small segment is removed from a specified location along the weld. Then, the sectioning technique is adopted in which a section taken transverse to the weld is machined, polished and etched successively so that small cracks on each sections can be detected by visual examination with a magnifying projector. Temperature and augmented strain at every crack location at the instant of strain application are estimated by means of calculations based on a few assumptions. Several indices representing hot cracking susceptibility, such as brittle temperature range, critical strain rate for temperature drop and minimum ductility are obtained from the test results. Secondly, the strain distribution at the instant of strain application is evaluated using the finite element method for temperature analysis and the boundary element method for thermal elasto-plastic analysis. It is supposed that the calculated values of the augmented strains are about half of the estimated values based on the simple assumption in which the applied strain will be distributed linearly.
社団法人日本船舶海洋工学会の論文
1988-03-22

鋼材の高温割れ感受性に関する一考察 : Trans-Varestraint試験について

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