Tensile properties of duplex UNS S32205 and lean duplex UNS S32304 steels and the influence of short duration 475 ºC aging

Materials Research

Sérgio Souto Maior Tavares²  Juan Manuel Pardal²  Hamilton Ferreira Gomes De Abreu¹  Cristiana Dos Santos Nunes¹  Manoel Ribeiro Da Silva¹ 

[1] ,Universidade Federal Fluminense Escola de Engenharia Niterói RJ ,Brasil

关键词: duplex stainless steel;    heat treatment;    tensile properties;    work hardening exponent;   

DOI  :  10.1590/S1516-14392012005000116

来源: SciELO

【 摘 要 】

Duplex stainless steels are high strength and corrosion resistant steels extensively used in the petrochemical and chemical industries. The aging at 475 ºC for long periods of time provokes embrittlement and deterioration of corrosion resistance. However, short duration aging at 475 ºC may be used as heat treatment to improve mechanical resistance with small decrease in the other properties. In this work the flow stress curves of lean duplex UNS S32304 and duplex UNS S32205 steels were modeled with Hollomon's equation and work hardening exponents (n) were determined. The analyses were conducted in specimens annealed and heat treated at 475 ºC for short periods of time. The aging at 475 ºC for 4 hours, 8 hours and 12 hours promoted significant hardening with small decrease of ductility. The work hardening exponents of both steels were compared, being higher in the duplex steel than in the lean duplex grade.

【 授权许可】

CC BY   
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