Effect of heat treatment temperature on the performance of nano-TiO 2 coating in protecting 316L stainless steel against corrosion under UV illumination and dark conditions

This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness of the film and the change in the contents of each element. In addition, electrochemical analyses of each heat-treatment condition was used to quantitatively compare corrosion resistance and passive film stability based on the relative chromium, silicon, and tin contents. It was found that the addition of silicon and tin compensated for the decrease in corrosion resistance induced by the chromium reduction. The addition of the two elements inhibited iron (Fe) oxide production in the surface oxide film, thereby improving the corrosion resistance of the material and improving the stability of the passive film. Moreover, the SiO2 and SnO2 layers inhibited the production of Fe oxide and contributed to the stability of the film along with Cr2O3, the main component of the passive film. However, when the heat treatment temperature increased above a specific temperature, the oxide inhibitory effect of the two elements was relatively offset. Nevertheless, further research to optimize the content of the three elements will help develop materials with superior mechanical properties and corrosion resistance.

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Effect of cooling rate after heat treatment on pitting corrosion of super duplex stainless steel UNS S 32750

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-05-2018-1939 ◽

2018 ◽

Vol 65 (5) ◽

pp. 492-498 ◽

Cited By ~ 1

Author(s):

Byung-Hyun Shin ◽

Junghyun Park ◽

Jongbae Jeon ◽

Sung-bo Heo ◽

Wonsub Chung

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Corrosion Resistance ◽

Cooling Rate ◽

Pitting Corrosion ◽

Heat Treatment Temperature ◽

Secondary Phase ◽

Treatment Temperature ◽

Super Duplex Stainless Steel ◽

Content Type

Purpose In this study, super duplex stainless steel (SDSS) was heat-treated. The purpose of this study is to assess the effect of the cooling rate after heat treatment on the pitting corrosion of SDSS. Design/methodology/approach The heat treatment from 1,000°C to 1,300°C was applied to SDSS to check the effect of the cooling rate. Findings The heat treatment temperature produced a different SDSS microstructure, and the cooling rate led to the growth of austenite. The casted SDSS indicated the presence of heterogeneous austenite, and the precipitation secondary phase under 1.6 per cent precipitated to bare metal. By applying heat treatment and cooling SDSS, its corrosion resistance changes because of the change in the chemical composition. The cooling rate at 5,600 J/s has the highest critical pitting temperature (CPT) at 1,100°C, and the cooling rate at 1.6 J/s has the highest CPT at 1,200°C. Low cooling rate (0.4 J/s) made the secondary phase at all temperature range. Research limitations/implications The effect of secondary phase not consider because that is well known to decreasing corrosion resistance. Practical implications Solution annealing is taken into account to optimize the corrosion resistance. But that is not consider the cooling rate at each temperature. This study assessed the effect of the cooling rate at each temperature point. Social implications Manufacturers need to know the effect of the cooling rate to optimize the corrosion resistance, and this study can be applied in the industrial scene. Originality/value SDSS is hard the optimization because SDSS is a dual-phase stainless steel. Corrosion resistance can be optimized by controlling heat treatment temperature and the cooling rate. Anyone not studied the effect of the cooling rate at each temperature. The effect of the cooling rate should be considered to optimize the corrosion resistance.

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Heat treatment temperature influence on ASTM A890 GR 6A super duplex stainless steel microstructure

Materials Characterization ◽

10.1016/j.matchar.2005.05.008 ◽

2005 ◽

Vol 55 (3) ◽

pp. 225-233 ◽

Cited By ~ 49

Author(s):

Marcelo Martins ◽

Luiz Carlos Casteletti

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Duplex Stainless Steel ◽

Heat Treatment Temperature ◽

Treatment Temperature ◽

Temperature Influence ◽

Super Duplex Stainless Steel ◽

Steel Microstructure

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Corrosion resistance of UNS S31803 stainless steel welded joints

Acta Metallurgica Slovaca ◽

10.12776/ams.v24i2.1073 ◽

2018 ◽

Vol 24 (2) ◽

pp. 147

Author(s):

Paolo Ferro ◽

Jan-Olof Nilsson ◽

Franco Bonollo

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Corrosion Resistance ◽

Welded Joints ◽

Heat Treatment Temperature ◽

Experimental Tests ◽

Treatment Temperature ◽

Gas Composition ◽

Shielding Gas ◽

Heat Treated

<p>The corrosion resistance of duplex stainless steel welded joints is affected by different parameters such as filler metal chemical composition, heat input, shielding gas composition and post welding heat treatment temperature. In most cases such parameters interact with each other so that it is very difficult to foresee their effect on corrosion resistance of welded joints without specific experimental tests. In this work the best combination of shielding gas composition and post welding heat treatment temperature that guarantees the corrosion resistance of the joint according to ASTM A932, method C, was found. Two shielding gases were tested during welding, Ar (100%) and a mixture of Ar (87%), He (10%) and N (3%), while the solution temperatures were 1050 °C and 1070 °C. It was found that only the samples welded with the mixture of Ar (87%), He (10%), N (3%) as shielding gas and solution heat treated at 1070 °C passed the corrosion test completely.</p>

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Effect of Heat Treatment Temperature on Microstructure and Properties of PM Borated Stainless Steel Prepared by Hot Isostatic Pressing

Materials ◽

10.3390/ma14164646 ◽

2021 ◽

Vol 14 (16) ◽

pp. 4646

Author(s):

Yanbin Pei ◽

Xuanhui Qu ◽

Qilu Ge ◽

Tiejun Wang

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Heat Treatment Temperature ◽

Hot Isostatic Pressing ◽

Fracture Morphology ◽

Treatment Temperature ◽

Isostatic Pressing ◽

Different Temperatures ◽

Strength And Plasticity ◽

Borated Stainless Steel

Borated stainless steel (BSS) with a boron content of 1.86% was prepared by a powder metallurgy process incorporating atomization and hot isostatic pressing. After solution quenching at 900–1200 °C, the phase composition of the alloy was studied by quantitative X-ray diffraction phase analysis. The microstructure, fracture morphology, and distributions of boron, chromium, and iron in grains of the alloy were analyzed by field-emission scanning electron microscopy with secondary electron and energy-dispersive spectroscopy. After the coupons were heat treated at different temperatures ranging from 900 to 1200 °C, the strength and plasticity were tested, and the fracture surfaces were analyzed. Undergoing heat treatment at different temperatures, the phases of the alloy were austenite and Fe1.1Cr0.9B0.9 phase. Since the diffusion coefficients of Cr, Fe, and B varied at different temperatures, the distribution of elements in the alloy was not uniform. The alloy with good strength and plasticity can be obtained when the heat treatment temperature of alloy ranged from 1000 to 1150 °C while the tensile strength was about 800 MPa, with the elongation standing about 20%.

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