The Influence of Sample Preparation on the Quantitative Analysis of the Volume Fraction of Martensite Formed in a 304l Trip Steel

Alves, Juciane Maria; Brandão, Luiz Paulo Mendonça; Paula, Andersan dos Santos

doi:10.1590/1516-1439.347714

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…The SEM image for 316LSS (Figure 3_2a) evidenced the austenitic grain boundaries, with clear signs of corrosion on some grains (there was no intergranular corrosion, but general corrosion had been initiated). Since 316LSS is susceptible to martensitic transformation induced by deformation, at room temperature, this corrosion behaviour could be attributed to the previous metallographic mechanical polishing, which was unable to remove some of the martensitic phase formed on the surface during sanding [4]. This was evidenced by the presence of emery paper scratches on the sample surface and was supported by previous work reporting the occurrence of the TRIP effect for 316 steels [46].…”

Section: Resultsmentioning

confidence: 61%

See 1 more Smart Citation

Is duplex stainless steel more corrosion resistant than 316L in aqueous acid chloride-containing environments at temperatures higher than 100°C?

Ferreira

Silva

Costa

et al. 2018

Corrosion Engineering, Science and Technology

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The influences of temperature and chloride content on the corrosion resistance of stainless steels (SS) in acid solution were investigated employing polarisation curves (PC) and electrochemical impedance spectroscopy measurements. Although the duplex SS presented a higher pitting resistance equivalent number than that of 316L SS, the PC for the duplex SS in solution containing 250 ppm chloride ions showed a surprisingly large positive hysteresis loop, suggesting that there was damage to the passive film caused by localised intergranular corrosion at 120 o C. In contrast, it was interesting to note that the 316L SS immersed in an acid solution containing 250 ppm chloride did not exhibit pitting corrosion. The oxides naturally formed on both steels at open circuit potential at 120 o C had double layer structures and their thicknesses were obtained from constant phase element calculations.

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Section: Resultsmentioning

confidence: 61%

“…These modified steels are known as the 300 series [1]. In these steels, the austenitic phase is stable at room temperature, but martensitic phase can be formed by transformation induced by plasticity (the TRIP effect), which occurs when the steel is subjected to external stresses leading to elastic or plastic deformation [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Is duplex stainless steel more corrosion resistant than 316L in aqueous acid chloride-containing environments at temperatures higher than 100°C?

Ferreira

Silva

Costa

et al. 2018

Corrosion Engineering, Science and Technology

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“…Austenitic stainless steel, as a typical example of the above situation, has been explored to examine the relationship between strength and ductility by numerous scholars due to its combination of high mechanical strength, high formability, high corrosion resistance, and exceptional weldability. [3][4][5] Proper rolling and subsequent heat treatment were determined to be the keys to obtaining a NG/UFG microstructure and to enhancing the strength and ductility of austenitic stainless steel. [6][7][8][9] The combination of conventional heavy cold rolling and a subsequent annealing process proposed by Misra's group manifests that the combination of high strength and high ductility can be obtained in 204Cu, 301LN, and 316LN UFG austenitic stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Yielding Behavior and Strengthening Mechanisms of a High Strength Ultrafine‐Grained Cr–Mn–Ni–N Stainless Steel

Xie

Huo

et al. 2021

steel research int.

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The microstructure of Cr–Mn–Ni–N stainless steel is regulated by a combination of cold deformation and subsequent martensite reversed annealing. The yield strength and tensile strength of the tested steel are greatly improved to 1220 and 1357 MPa, respectively, by conventional heavy cold rolling (66% thickness reduction) and a subsequent annealing process (750 °C for 5 min) relative to those before cold rolling (austenized state); at the same time, the total elongation keeps an appropriate value. The results show that the grain refinement strengthening acts as the primary factor for the strengthening of the tested steels while the precipitation behavior from the M23C6‐type carbides is not quite effective. Additionally, different yield phenomena and microstructural evolution for tested steels with 66% thickness reduction annealed at 750 °C with different holding times are systematically analyzed and discussed. Lüders‐like deformation features noticeably appear but become weakening with the longer annealing time. The change in initial free mobile dislocation density is the core cause of the preyield plateau phenomenon.

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“…This may happen by the influence of sample preparation during mechanical polishing or other methods, which apply external stress on the sample surface. To avoid the problem, different sample preparation methods have been explored, with the aim of finding the best practice to obtain the best flatness of the surface for EBSD analyses without inducing the austenite to martensite transformation (γ -α') [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sample Preparation on the Microstructure of Austenitic-Ferritic Stainless Steel

Juuti

Uusikallio

Kaijalainen

et al. 2016

MSF

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Sample preparation of metastable austenitic-ferritic steels can have a significant effect on the apparent microstructure due to the transformation of austenite to martensite (γ - α'). As a result, these steels often have a complex microstructure with ferrite and martensite, which have relatively similar crystal structures, making it very difficult to analyse. However, the quantitative analysis of such microstructures and the effect of the sample preparation are very important for the further study of the steel. In this research, the effect of sample preparation in metastable austenitic-ferritic stainless steel was studied by using three different sample preparation methods. In addition to conventional mechanical etching with colloidical silica and electropolishing, focused ion beam (FIB) milling was used to create an optimal sample surface to be further analysed with electron backscatter diffraction (EBSD). Micrographs were obtained from each sample before and after sample preparation using field emission scanning electron microscopy (FESEM) and laser scanning confocal microscopy (LSCM), and the microstructure was analysed using EBSD. The surface flatness required for good EBSD analysis was significantly better using FIB milling than mechanical polishing, while electropolishing results in the greatest topography and an arched sample surface. The amount of martensite was found to be dependent on the sample preparation: least martensite was formed during electropolishing, while surprisingly mechanical polishing and FIB milling resulted in equal amounts of martensite.

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The Influence of Sample Preparation on the Quantitative Analysis of the Volume Fraction of Martensite Formed in a 304l Trip Steel

Cited by 9 publications

References 6 publications

Is duplex stainless steel more corrosion resistant than 316L in aqueous acid chloride-containing environments at temperatures higher than 100°C?

Is duplex stainless steel more corrosion resistant than 316L in aqueous acid chloride-containing environments at temperatures higher than 100°C?

Yielding Behavior and Strengthening Mechanisms of a High Strength Ultrafine‐Grained Cr–Mn–Ni–N Stainless Steel

The Effect of Sample Preparation on the Microstructure of Austenitic-Ferritic Stainless Steel

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