Solution of TiN during Synthetic Weld Thermal Cycling and Heat Affected Zone Toughness in Low Carbon Steels

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The effects of Ti and Al on the notch toughness of the synthetic weld heat affected zone (HAZ) have been investigated using 41kgf/mm^2 grade steels containing various quantities of N. Ti forms mostly TiN particles in the base metal, but both soluble Ti and soluble N are formed in the matrix by the dissolution of the part of TiN particles when the synthetic thermal cycle of the maximum temperature of 1350℃×5 sec and the cooling time of 800 to 500℃ of 40 sec is given to the base metal. As it is considered that the amounts of these soluble Ti and soluble N, together with TiN, affect strongly HAZ toughness, the effect of these three factors on HAZ toughness has been investigated quantitatively in this paper. Main results obtained are as follows; (1) The synthetic HAZ toughness of the steel containing 13 ppm N is the most superior to all the other steels. When N in steels is less than 20 ppm, additions of Ti and/or Al deteriorate the notch toughness. (2) The HAZ toughness is improved by Ti addition, especially, when Ti is added about 3.4 times the N content to steels containig of 20 to 60 ppm N. (3) It is considered that TiN particles dissolve depending on a solubility product of TiN. (4) Transition temperature, υTrs, of the synthetic HAZ depends strongly on the forms of Ti and N. (5) The HAZ toughness deteriorates a little with an increasing Ti and N content in spite of both the constant amount in soluble Ti and soluble N and the refinement of the microstructures. It is considered that large TiN particles over 0.3 μm cause the initiation and the propagation of brittle cracks and therefore deteriorate the HAZ toughness.
社団法人溶接学会の論文
1987-10-01

Solution of TiN during Synthetic Weld Thermal Cycling and Heat Affected Zone Toughness in Low Carbon Steels

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