Abstract
The aim of this work was the analysis of the influence of precipitates on the magnetic and mechanical properties, during the thermal treatment of a duplex stainless steel at 475 and 550°C, as well as during the thermal aging at 610°C of a Fe–20Mo–5Ni–0.12C alloy. In the duplex stainless steel it was verified that the precipitation of the α′ phase inside the α phase increases the coercive force, H c, and increases the mechanical hardness of the α phase, for the heat treatment at 475°C. In this process the mechanical hardness of the γ phase remains constant. After the heat treatment at 550°C the mechanical hardness of the α phase and the coercive force of the stainless steel remain practically constant. For the Fe–20Mo–5Ni–0.12C alloy the thermal aging at 610°C results in simultaneous magnetic and mechanical hardening. In both cases (steel and alloy) the magnetic and mechanical hardening curves are similar.
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