EFFECTS OF PRECIPITATION FOR AGING ONMECHANICAL AND CORROSION RESISTANCE PROPERTIES OF CAST 2507 SUPER DUPLEX STAINLESS STEEL

XIANG Hong-Liang; LIU Dong; HE Fu-Shan; HUANG Li-Guang; YUAN Pang-Ru

doi:10.3724/SP.J.1037.2010.00143

2010 , Vol. 46 >Issue 8: 941 - 945

DOI: https://doi.org/10.3724/SP.J.1037.2010.00143

论文

EFFECTS OF PRECIPITATION FOR AGING ONMECHANICAL AND CORROSION RESISTANCE PROPERTIES OF CAST 2507 SUPER DUPLEX STAINLESS STEEL

XIANG Hong-Liang ,
LIU Dong ,
HE Fu-Shan ,
HUANG Li-Guang ,
YUAN Pang-Ru

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School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108

Received date: 2010-03-25

Revised date: 2010-05-13

Online published: 2010-08-10

Supported by

Supported by Program for Service of Enterprise by Technical Personnel, the Ministry of Science and Technology of China (No.2009GJC40018), Innovation Foundation for Young Talent of Fujian Province (No.2008F3061) and Technological Development Foundation of Fuzhou University (No.2008–XQ–16)

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Abstract

Duplex stainless steel (DSS) has been used widely due to its very excellent combination of mechanical and corrosion resistance properties. However, the use of DSS is limited by their susceptibility to the formation of dangerous intermetallic phases, such as χ phase and phase, resulting in the detrimental effects on mechanical properties and corrosion resistance. With the application of the super duplex stainless steel (SDSS) with a pitting resistance equivalent number more than 40. The harmful effects of intermetallic phases easily precipitated in DSS on mechanical properties and corrosion resistance are a research focus. This paper, based on prior study, investigates the effects of intermetallic phases formed during aging on the mechanical properties and corrosion resistance of cast 2507 super duplestainless steel by means of optical microscope (OM), scanning electron microscope (SEM), tensile test and electrochemical test. The results indicate that for the solution annealing cast 2507 super duplex stainless steel aged in the temperature range 650—950 ℃, small and depressive distribution χ phase precipitatd from ferrite can increase its tensile strength, but σ phase causes the opposing effect on its plasticity owing to precipitated along grain boundaries. Both of them can rapidly deteriorate its plasticity, and cause brittle failure. The effect of σ phase on corrosion resistance of 2507 SDSS is weaker than phase. The more the σ phase is, the worse the corrosion resistant could be.

Key words： cast 2507 super duplex stainless steel; intermetallic phase; mechanical roperty; corrosion resistance

Cite this article

XIANG Hong-Liang , LIU Dong , HE Fu-Shan , HUANG Li-Guang , YUAN Pang-Ru . EFFECTS OF PRECIPITATION FOR AGING ONMECHANICAL AND CORROSION RESISTANCE PROPERTIES OF CAST 2507 SUPER DUPLEX STAINLESS STEEL[J]. Acta Metall Sin, 2010 , 46(8) : 941 -945 . DOI: 10.3724/SP.J.1037.2010.00143

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