Abstract
The article presents the results of studies on the influence of simulated thermal cycles parameters on the structure and properties of the heat-affected zone (HAZ) of thermo-mechanically rolled S700MC steel. For this purpose, resistance heating tests of the tested samples were carried out to determine the effect of maximum temperatures of the imposed thermal cycles with different maximum temperatures at a constant cooling time in the temperature range between 800 and 500 °C (t8/5) and to study the influence of changes of this time on the structure and hardness as well as the tensile strength, elongation and toughness of the simulated HAZ in S700MC steel. The results of the tests, were supported by the results of finite element method (FEM) analyses in the VisualWeld (SYSWELD Code) software of the ESI Group. Selected heat distributions during heating, distributions of individual metallurgical phases and hardness were compared with results from real tests. On the basis of the results presented, an attempt was made to explain the decrease in mechanical and plastic properties in the HAZ area caused by the influence of the welding heat cycle.
Highlights
Modern, dynamically developing industry is looking for new construction materials that can meet a set criteria regarding strength, mass, aesthetics and price
Real tests and numerical simulations allowed determining the heat-affected zone (HAZ) behaviour of S700MC steel subjected to the effect of a simulated welding heat cycle
Microscopic metallographic studies of simulated HAZ areas heated by cycles of different Tmax showed that in the maximum cycle temperature range from 400 to 900 ◦ C, HAZ of S700MC steel is characterized by a fine-grained bainitic-ferritic structure
Summary
Dynamically developing industry is looking for new construction materials that can meet a set criteria regarding strength, mass, aesthetics and price. The use of modern metallurgical technologies and metallurgical processing, as well as a new look at the significance and role of alloying elements used in steels, allowed the production of various steel groups with a wide range of mechanical and plastic properties [1,2,3,4,5]. Pre-heating is required when welding such steels, which increases the cost of producing welded structures The competition for this type of steel is thermo-mechanically processed steel with a high yield strength, which show a much lower real carbon equivalent (determined on the basis of chemical composition analysis) [27,28,29,30,31].
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