Effect of Ti and N on Notch Toughness of Synthetic Weld Heat Affected Zone

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 microalloy element 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 0.006 wt % 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 soluble N and Ti even if the microstructures are the most favorable. (4) Optimum Ti content to improve the notch toughness is given by the following equation : Optimum Ti (wt %)=-1070 N3+1.09 N+ 0.0137. (5) The summation of soluble Ti and soluble N should be considered as an important factor affecting the notch toughness.
社団法人溶接学会の論文
1984-10-01