Effect of W and Ti addition on oxidation behavior and area-specific resistance of Fe–22Cr–0.5Mn ferritic stainless steel for SOFCs interconnect

2014 ◽  
Vol 39 (5) ◽  
pp. 2286-2296 ◽  
Author(s):  
Azim Safikhani ◽  
Mohammad Aminfard
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Oxidation Behavior ◽  
Specific Resistance ◽  
Area Specific Resistance ◽  
Ti Addition

scholarly journals Effect of Ti Addition on Oxidation Behavior of High-Purity Ferritic Stainless Steel

2018 ◽  
Vol 82 (5) ◽  
pp. 130-139
Author(s):  
Yoshiharu Inoue ◽  
Nobuhiko Hiraide ◽  
Atsutaka Hayashi ◽  
Kohsaku Ushioda
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
High Purity ◽  
Oxidation Behavior ◽  
Ti Addition

Effect of Ti Addition on Oxidation Behavior and Area Specific Resistance of Fe-20Cr Alloys for SOFC Interconnects

2014 ◽  
Vol 660 ◽  
pp. 249-253 ◽  
Author(s):  
Zaka Ruhma ◽  
Asep Ridwan Setiawan ◽  
Aditianto Ramelan ◽  
Rochim Suratman
Keyword(s):  
Oxidation Behavior ◽  
Specific Resistance ◽  
Parabolic Rate Constant ◽  
Xrd Analysis ◽  
Oxidation Rates ◽  
Air Atmosphere ◽  
Ti Alloys ◽  
Initial Stage ◽  
Area Specific Resistance ◽  
Ti Addition

In this work, the oxidation behavior of Fe-20wt.%Cr alloys with different titanium contents: 0, 0.5, and 1 wt.% are studied as a function of time in air atmosphere. The samples were isothermally oxidized at 700°C for 24, 48, and 96 h in a box furnace. The area specific resistance of oxides formed at the alloys surface during oxidation is measured by four-point probe methods at 700°C for 24 h. For Ti containing alloys, surface morphology observation by SEM shows that a few of TiO2 particles formed on the top of Cr2O3 scales. Continous TiO2 layer was not formed at the alloys surface after oxidation. XRD analysis on the oxide scales of Fe-20Cr-Ti alloys confirms that Cr2O3 and TiO2 oxide formed on the alloys. Ti addition into the alloys increases the oxidation rates of alloys at the initial stages. Oxidation behavior of Fe-20Cr-0.5Ti and Fe-20Cr-1Ti alloys showed two regimes. The parabolic rate constant, kp (in gr2/cm4s) were 1.57 x 10-13 and 3.08 x 10-13 respectively for initial stage of oxidation then changed to-9 x 10-15 and-3 x 10-14 respectively for the remainder of the test. ASR measurement shows that the presence of Ti in the alloys decreases the electrical resistance up to 60%. Ti addition into Fe-Cr alloys affect the oxide growth rate and increase the conductivity of Cr2O3 scales.

scholarly journals Effect of Si Addition on Oxidation Behavior of Nb Containing Ferritic Stainless Steel

2018 ◽  
Vol 58 (6) ◽  
pp. 1117-1125 ◽  
Author(s):  
Yoshiharu Inoue ◽  
Nobuhiko Hiraide ◽  
Kohsaku Ushioda
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Oxidation Behavior ◽  
Si Addition

Inclusions evolution during the LF refining process of 439 ultra-pure ferritic stainless steel

2019 ◽  
Vol 116 (6) ◽  
pp. 619
Author(s):  
Xingrun Chen ◽  
Guoguang Cheng ◽  
Yuyang Hou ◽  
Jingyu Li
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Refining Process ◽  
Stable Phase ◽  
X Ray ◽  
Titanium Aluminum ◽  
Reasonable Range ◽  
Ti Addition ◽  
Automatic Scanning ◽  
Lf Refining

The morphology, composition, size, and number of inclusions in 439 ultra-pure ferritic stainless steel samples were analyzed using an automatic scanning electron microscope combined with an energy-dispersive X-ray spectrometer. In addition, the appropriate contents of titanium, aluminum, and calcium were analyzed through the coupling of thermodynamics calculation and experimental results. CaO-Al2O3-MgO inclusions existed in the 439 steel before Ti additions in the ladle furnace (LF) refining process. After Ti addition in the LF refining process, the inclusions were transformed into CaO-Al2O3-MgO-TiOx inclusions. The evolution of these inclusions was consistent with thermodynamic calculation, which indicated that when the Al, Ca, and Ti contents were within a reasonable range, Ca treatment could significantly modify the aluminate and spinel to form CaO-Al2O3-MgO liquid inclusions. In addition, the compositions of inclusions after the addition of titanium were mostly located in the Al2O3-TiOx stable phase. The collision of the CaO-Al2O3-MgO liquid inclusions and Al2O3-TiOx inclusions resulted in the modification of the CaO-Al2O3-MgO-TiOx inclusions. The compositions of most inclusions were located in the liquid zone. The control range of the aluminum, calcium, and titanium contents was obtained: logAl% ≥ 1.481logTi% − 0.7166, Ca% ≥ 34.926(Al%)3 − 3.3056(Al%)2 + 0.1112(Al%) − 0.0003.

scholarly journals Effect of Si Addition on Oxidation Behavior of Nb containing Ferritic Stainless Steel

2016 ◽  
Vol 102 (12) ◽  
pp. 704-713 ◽  
Author(s):  
Yoshiharu Inoue ◽  
Nobuhiko Hiraide ◽  
Kosaku Ushioda
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Oxidation Behavior ◽  
Si Addition
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