New development routes have been explored for the design of strong and tough steel weld metals. An analysis using neural network modelling suggested that the impact toughness could be increased with little loss in strength, by using only a limited amount of manganese in association with 7-9 wt% of nickel. Yield strengths in the range 720-850 MPa have been recorded, with Charpy toughness levels up to 113 J at -40oC and 101 J at -60oC. Light optical microscopy, scanning and transmission electron microscopy have been used to characterise the microstructure and to investigate the retained austenite, martensite and bainite. The dramatic synergistic effect of nickel and manganese on microstructure and properties is discussed.
TODAY AND TOMORROW IN THE SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Proceedings of the 7th International Welding Symposium, Japan Welding Society, 20-22 November 2001, Kobe, Japan. Edited by T. Ohji, published by the Japan Welding Society, Tokyo, pp. 797-802.
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