Creep and Hot Tensile Behavior of AISI 201LN Austenitic Stainless Steel

AISI 200LN is a low nickel austenitic stainless steel (SS) in which nitrogen and manganese are used for nickel substitution. It shows excellent mechanical properties at room and cryogenic temperatures, with a lower production cost, if compared to the traditional 300 series SS. In spite of that, the performance of AISI 200 series SS under creep conditions remains largely underexplored in the literature. This study aims to assess the mechanical response of the AISI 201LN alloy when subjected to hot tensile and creep tests. The tensile tests were conducted at room temperature and in the range of 500 degrees C to 800 degrees C, whereas the creep tests were performed under constant load and within the temperature range 600 degrees C to 800 degrees C. Correlations among stress, temperature, secondary creep rate, rupture time, and creep ductility were obtained and results were compared to the literature data for the 300 series of traditional stainless steels. Based on the Zener-Hollomon parameter, constitutive equations were applied to describe the creep behavior of AISI 201LN within the range of stresses and temperatures used.