Quantitative Evaluation of Solidication Brittleness of Weld Metal during Solidification by In-Situ Observation and Measurement (Report III) : Effect of Strain Rate on Minimum Ductility Required for Solidification Crack Initiation in Carbon Steels, Stainle

概要

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Initiation condition of weld solidification cracking in relation to strain rate is analyzed by direct observation technique MISO for plain carbon steels, stainless steels and so on. All the materials used show a dependency of the minimum dutility required for crack initiation on strain rate. Namely, the minimum ductility is lowered with a decrease in strain rate. The tendency is noticeable in materials of low crack susceptibility. Therefore, for the comparison of crack susceptibilities among materials the minimum ductility measured under a high strain rate is better than that under a low strain rate. On the other hand, the strain rate in the self-restraint cracking test and perhaps also in welding the fabrication is shown to be so low that the difference of the minimum ductility among materials is little. Under such low strain rate, the lower critical strain rate below which the crack can not occur is excellent for the comparison of crack susceptibilities.
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