Oxidation behavior of sintered 316L austenitic stainless steel-yttria composites with various additions

Lal, Sunder; Upadhyaya, G. S.

doi:10.1007/bf00664804

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…It is true that the bibliography published up to now about high temperature oxidation resistance of PM stainless steels is based on gravimetric results. 3,15,22,24,[32][33][34] However, the study of PM materials with very different porosity levels, as those considered in this study, stresses that the mass gains are very dependent on the extent of the oxidation that occurs in the inner pores and can not be related to the amount of oxide formed on the surface. The decrease in the mass gain caused by the addition of small quantities of GA powder to the 434L is very remarkable after exposures to 800 and 900uC (Fig.…”

Section: Oxidation Behaviourmentioning

confidence: 78%

Mechanical and oxidation properties of high density sintered duplex stainless steels obtained from mix of water and gas atomised powders

Bautista¹,

Moral²,

Blanco³

et al. 2006

Powder Metallurgy

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High density powder metallurgy duplex stainless steels have been obtained by mixing water and gas atomised powders. AISI 434L water atomised ferritic powders were mixed with different percentages (up to 50%) of AISI 316L gas atomised powders. The mixtures were then compacted by uniaxial pressing and vacuum sintered at three temperatures. Physical and mechanical properties were measured, showing the positive influence of small size austenitic powders in density and strength. Best materials were submitted to oxidation tests at 800 and 900uC. Mass gains during high temperature exposure have been dramatically reduced by the addition of gas atomised powders. Characterisation of the scales through scanning electron microscopy and X-ray diffraction has shown that the mixtures mainly comprise chromia, although other oxides have been detected.

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Section: Oxidation Behaviourmentioning

confidence: 78%

Mechanical and oxidation properties of high density sintered duplex stainless steels obtained from mix of water and gas atomised powders

Bautista¹,

Moral²,

Blanco³

et al. 2006

Powder Metallurgy

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“…The existing bibliography to date on the behavior of porous metals at high temperatures is limited, although in previous investigations, exclusively focused on PM stainless steels, it is quite clear that the presence of pores affects the amount of oxides formed [18]. Porosity greatly increases the real area of metal exposed to attack, with which the mass gain per unit of the apparent surface increases dramatically [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Highly Porous Metallic Components

et al. 2008

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This paper covers a study on the oxidation behavior in air of four materials processed by means of powder metallurgy (PM), in such a manner that their porosity will be high and so they can be used to manufacture anodic supports in solid-oxide fuel cells (SOFC). For this, powders with a Fe base (AISI 430L and Fe22Cr grades) and with Ni base (Ni20Cr and Ni625 grades) have been processed through a novel method specifically designed for this type of applications. The oxidation kinetics of the four materials has been studied during their exposure to high temperature, and the oxides formed both inside and on the samples have been characterized. The protective abilities of the oxides formed depend on the chromium losses during sintering of the outer surface, the oxygen diffusion rate during hightemperature exposure and the irregularities on the morphology caused by the processing method. The results of these studies have allowed to reach the conclusion that, from amongst the materials tested, Fe22Cr exhibits the best behavior in air at 800°C.

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“…. Conventional PM steels have intrinsically lower oxidation properties at high temperature in comparison with wrought fully dense steels with same compositions . Studies showed that porosity of these materials not only increases the effective area, exposed for oxidation, to many folds but also affect the nature of the protective film formed on the surface of these SSs .…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on the corrosion properties of nanostructured Fe‐18Cr‐2Si alloy prepared by SPS

Ahmed

Toor

Al-Aqeeli

2016

Materials & Corrosion

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Nanostructured Fe-18Cr-2Si alloys were developed by a combination of mechanically alloying (MA) and spark plasma sintering (SPS) process. SPS was carried out in vacuum at three different temperatures (900, 1000, and 1100 8C) with a fixed holding time of 10 min and an applied pressure of 50 MPa. Potentiodynamic polarization (PDP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) were used to study the effect of sintering temperature on the electrochemical properties of newly developed nanostructured ferritic Fe-18Cr-2Si alloy. XRD results showed that, after sintering, crystallite size increased with increasing sintering temperature and maximum crystallite size was 23.64 nm. The results showed that with increasing sintering temperature, corrosion resistance was increased in terms of pitting potential (E pit ), passive current density (i p ), and polarization resistance (Rp). The improved corrosion resistance was found to be closely related with the densification of the sintered alloys.

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Oxidation behavior of sintered 316L austenitic stainless steel-yttria composites with various additions

Cited by 11 publications

References 11 publications

Mechanical and oxidation properties of high density sintered duplex stainless steels obtained from mix of water and gas atomised powders

Mechanical and oxidation properties of high density sintered duplex stainless steels obtained from mix of water and gas atomised powders

Oxidation Behavior of Highly Porous Metallic Components

Effect of sintering temperature on the corrosion properties of nanostructured Fe‐18Cr‐2Si alloy prepared by SPS

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