Hot Deformation of Martensitic and Supermartensitic Stainless Steels

Abstract

The deformation behavior of supermartensitic and martensitic stainless steels was investigated through compression test using Gleeble-3800 thermo-mechanical simulator within the temperature range of 900 – 1200 оС and the strain rates range of 0.01 – 10 s-1. The results showed that the flow stress and the peak strain increase with the drop in the deformation temperature and the rise in the strain rate. Flow stress of SMS steel exceeds flow stress of MS steel for same regimes of deformation. The difference in flow stress increases with the increase in Zener-Hollomon parameter, but does not exceed 15 MPa. The critical deformation, required to start dynamic recrystallization, for supermartensitic stainless steel is slightly lower than for martensitic stainless steel. The hot deformation activation energy of steels is also investigated, their values are similar and equal to 432 and 440 kJ/mol for MS and SMS steel, respectively.

Evolution of microstructure in stainless martensitic steel for seamless tubing

“…High alloying of these materials provides fine, mainly martensitic microstructure additionally strengthened by carbide precipitations and a unique combination of corrosion and mechanical properties resulting from deformation and heat treatments [4][5][6][7]. This paper studies the peculiarities of the microstructure forming in high-chromium martensitic steel through few steps of industrial seamless pipe processing -hot deformation, quenching and tempering at high temperature -for better understanding and further optimization of technology.…”

Optimization of the Chemical Composition of Supermartensitic Stainless Steel Using Thermodynamic Calculations

“…Изделия из сталей супермартенситного класса, к которым относится сталь 10Х13Н3МФБ, после деформации и термических обработок отличаются дисперсной мартенситной структурой, упрочненной карбидными фазами, что достигается за счет высокого легирования [1][2][3][4][5]. Высокохромистые коррозионностойкие стали данного класса типа «13Cr» и «суперхром» применяют в изготовлении труб для добычи нефти и газа в прибрежных зонах и открытом море [6][7][8].…”