Evaluation of Transformation Expansion and Its Beneficial Effect on Cold Crack Susceptibility Using y-Slit Crack Test Instrumend with Strain Gauge(Materials, Metallurgy & Weldability)

概要

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A new technique named "the Instrumented y-Slit Crack Test" was invented in order to estimate easily the effect of transformation expansion on the restraint stress using conventional y-slit crack test specimen utilizing strain gauges. Moreover, the effect of transformation expansion on cold cracking susceptibility is quantitatively investigated for SM41, SS41, HT60, HT80, HY130 and HY150 weldments by GTA and SMA weldings. Consequently, the progress of contraction or restraint stress in the Instrumented y-Slit Crack Test can be estimated using this technique which is enough sensitive and good reproducibility. Therefore, this technique may be substituted for the RRC test in order to evaluate the effect of transformation expansion on cold cracking susceptibility. For example in this study, the cracking ratio of HY150 weldment is much less than that of HT80 weldment in the y-slit crack test, and this new technique clearly revealed that this reason is owing to the reduction of restraint stress due to transformation expansion.
大阪大学の論文