Application of Grain Growth Equation to the Selection of Welding Conditions

概要

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In this report, it is confirmed that the results obtained in the previous report can be applied to the selection of welding conditions in order to improve the toughness in weld-heat affected zone (HAZ) of high tensile steels. Main results obtained are as follows. (1) Toughness of high tensile steels with various microstructures can be improved by refinement of prior austenite grain. (2) Austenite grain size in HAZ of electron beam welding can be calculated using Eq. (1) derived in the previous report. (3) In electron beam welding of 100kg/mm^2 grade high tensile steel, it was clarified that toughness in HAZ could be improved considerably if heat input per unit penetration depth was controlled under 2.6KJ/cm^2, using Eq. (1).
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