再現溶接熱影響部の切欠靱性に及ぼす Ti 及び N の影響

概要

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Effects of microstructures, prior austenite grain size, soluble Ti, soluble N and insoluble Ti on the notch toughness of the synthetic weld heat affected zone have been investigated using mild steels with a microalloyelement Ti. the results obtained are as follows : (1) The austenite grains are refined by increase of Ti and N contents. Especially, the grain refinement occurs remarkably in specimens with less than 0.0060wt% N. (2) The microstructures are changed by Ti and N contents and when Ti and N contents are optimum the finest ferrite-pearlite structures are obtained. (3) the notch toughness strongly depends on the quantities of a soluble N and Ti even if the microstructures are the most favorable. (4) Optimum Ti content to improve the notch toughness is given by following Eq. Optimum Ti=-1070N^3+1.09N+0.0137 (wt%). (5) The summation of soluble Ti and soluble N should be considered as a important factor affecting the notch toughness.
社団法人溶接学会の論文
1982-01-05