Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Microstructure and mechanical properties of ultra-high strength steel Weldox 1300

nr katalogowy: 78036

For years, metallurgists seek to manufacture structural steel with the highest strength properties while still satisfying low temperature toughness. With the growth of the yield strength it is possible to make the structure of the elements of a smaller wall thickness, and therefore lighter and less expensive to transport. A smaller wall thickness requires less welding consumables and hence the welding process become shorter. The increase in strength properties of steel can be achieved by proper selection of the chemical composition and/or quenching and tempered processes. Such opportunities provide consistently quenched and tempered steels, by the adequately matched the chemical composition and appropriate heat treatment. These steels have very good mechanical properties and good plastic properties with good weldability. The mechanical properties and chemical composition can be found in the standard EN 10025-6 [1]. It should be noted, however, that the steels of yield strength above 1000 MPa are not mentioned in the current standard. This is due to the fact that these steels are a relatively new materials for constructions. An important development has been achieved in ultra-high strength low-alloy steels. The good impact properties is a result of the addition of small amounts of V by causing V4C3 precipitates to form during tempering. The dispersion strengthening by this carbide raises the yield strength while at the same time retards grain growth and improves the impact resistance [2]. The previous investigation have shown that Mo moderately increases the yield strength of martensitic steels, probably due to its large atomic size, whereas the addition of Mn results in a slight decreases in yield strength. Authors [3] reported that the both Mn and Mo increase the stacking fault energy of the austenite matrix, although Mn is generally considered to stabilize the ?Á phase by lowering the stacking fault energy of the austenite. [...]

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