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Titolo:
Effects of alloying elements on the mechanical properties and corrosion behaviors of 2205 duplex stainless steels
Autore:
Lieu, HY; Pan, YT; Hsieh, RL; Tsai, WT;
Indirizzi:
Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan Natl ChengKung Univ Tainan Taiwan 70101 ci & Engn, Tainan 70101, Taiwan China Steel Corp, Steel & Aluminum Res & Dev Dept, Kaohsiung 81233, TaiwanChina Steel Corp Kaohsiung Taiwan 81233 ev Dept, Kaohsiung 81233, Taiwan
Titolo Testata:
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
fascicolo: 2, volume: 10, anno: 2001,
pagine: 231 - 241
SICI:
1059-9495(200104)10:2<231:EOAEOT>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENVIRONMENTS; PERFORMANCE;
Keywords:
alloying elements; corrosion behaviors; crack sensitivity index; duplex stainless steel; hot ductility index; mechanical properties;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Lieu, HY Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 , Tainan 70101, Taiwan
Citazione:
H.Y. Lieu et al., "Effects of alloying elements on the mechanical properties and corrosion behaviors of 2205 duplex stainless steels", J MAT ENG P, 10(2), 2001, pp. 231-241

Abstract

The effects of alloying elements on the microstructure, mechanical properties, and corrosion behaviors of duplex stainless steels (DSSs) have been investigated in this study. Experimental alloys were prepared by varying the concentrations of the constituent elements in DSSs, Hot ductility test, tensile test, charpy impact test, and corrosion test were performed to evaluate the properties of the experimental alloys, The results showed that the extent of edge cracking of DSSs increased with the increasing value of the crack sensitivity index (CSI), The higher the hot ductility index (HDI) was, the better the hot ductility of DSSs achieved, Austenite (gamma) stabilizergenerally caused a decrease in the strength and an increase in the charpy impact absorbed energy of the stainless steel. On the contrary, ferrite (alpha) former exerted its beneficial effect on the strength but became detrimental to the toughness of DSSs, The presences of sulfur and boron also caused a decrease in the impact energy, but nitrogen and carbon hardly affectedthe toughness within the concentration range tested in this study. The value of pitting nucleation potential (E-np) of different nitrogen contents in3.5 wt.% NaCl solution at room temperature was almost the same, but the value of pitting protection potential (E-pp) among these alloys was increasedwith increasing the content of nitrogen. The susceptibility to stress corrosion cracking (SCC) of DSSs was high when tested in boiling 45 wt.% MgCl2 solution. On the other hand, the time to failure of the experimental steelsin 40 wt.% CaCl2 solution at 100 degreesC was longer than that in MgCl2 solution. Nitrogen could affect the SCC behavior of DSSs in CaCl2 solution through the combinative effects by varying the pitting resistance and the slip step dissolution. An optimum nitrogen (N) content of 0.15 wt.% was found where the highest SCC resistance could be obtained. Although gamma phase exhibited better resistance to SCC, cracks were found to penetrate through alpha and gamma grains or to propagate along the alpha/gamma interface, As a result, a mixed transgranular plus intergranular mode of fracture surface was observed.

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Documento generato il 30/03/20 alle ore 19:53:33