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Deformation abilities of Lean duplex stainless steel = Ugotavljanje preoblikovalnih sposobnosti dupleksnega nerjavnega jekla vrste Lean
Arzenšek, Boris ...
The aim of the work was to establish deformation abilities of Lean duplex stainless steel to get an information for its deformability at industrial rolling conditions at Acroni Jesenice and to make ...the comparison with another stainless steels. The deformability of the steel was established by hot tensile tests, rolling tests of flat and wedged specimens and metallografycal investigations of a rolled steel. The rolling temperatures were in the rolling range of steels in Acroni Jesenice, between 950 °C to 1250 °C. In the work the part of ferrite and austenite was also stated in dependence of temperature and deformation degree. The deformation degree at flat specimens was 3 * 18 % (S = 44 %) and at wedged specimens up to S = 65 %. From the results it was established that the steel has the best deformation abilities in temperature range of 1100 °C and 1250 °C and in the range 1100 °C to 1000 °C a little less. The ferrite contain increases by rising of rolling temperature from 38 % to 58 % and hardness of the rolling steel decreases from HV 290 to HV 250. The impact toughness of rolled steel is between 50 J and 100 J and after annealing 300 J to 350 J. Annealed steel contain 50 % to 55% of ferrite and the rest is austenite.
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