Corrosion behaviour of welded low-carbon steel in the Arctic marine environment

Purpose – This paper aims to investigate the corrosion behaviour of carbon steel in the Mauritian atmosphere over a three-year period. Atmospheric corrosion is a serious problem in Mauritius. Design/methodology/approach – Carbon steel samples were exposed outdoors at various sites. Mass loss analysis was performed to determine the corrosion behaviour of the metal over the exposure period. Scanning electron microscopy and Raman tests were performed to investigate the formation of the corrosion products on the carbon steel surface. Findings – It was found that the corrosion loss at two of the sites considered did not vary clearly according to the bilogarithmic law. Time of wetness was found to be a main factor affecting atmospheric corrosion in Mauritius. The corrosivity of the atmosphere was found to lie between categories C3 and C4, according to ISO 9223. Originality/value – The results can be of essential help to the construction industry, especially as steel buildings are becoming very common in Mauritius. Moreover, as Mauritius is a tropical island, the results obtained can be useful in other tropical islands.

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Effect of Carbon Partitioning, Carbide Precipitation, and Grain Size on Brittle Fracture of Ultra-High-Strength, Low-Carbon Steel after Welding by a Quenching and Partitioning Process

Metals ◽

10.3390/met8100747 ◽

2018 ◽

Vol 8 (10) ◽

pp. 747 ◽

Cited By ~ 4

Author(s):

Farnoosh Forouzan ◽

M. Guitar ◽

Esa Vuorinen ◽

Frank Mücklich

Keyword(s):

Grain Size ◽

Carbon Steel ◽

Weld Zone ◽

Low Carbon Steel ◽

High Strength ◽

Precipitate Size ◽

Low Carbon ◽

Quenching And Partitioning ◽

High Level ◽

The Impact

To improve the weld zone properties of Advanced High Strength Steel (AHSS), quenching and partitioning (Q&P) has been used immediately after laser welding of a low-carbon steel. However, the mechanical properties can be affected for several reasons: (i) The carbon content and amount of retained austenite, bainite, and fresh martensite; (ii) Precipitate size and distribution; (iii) Grain size. In this work, carbon movements during the partitioning stage and prediction of Ti (C, N), and MoC precipitation at different partitioning temperatures have been simulated by using Thermocalc, Dictra, and TC-PRISMA. Verification and comparison of the experimental results were performed by optical microscopy, X-ray diffraction (XRD), Scanning Electron Microscop (SEM), and Scanning Transmission Electron Microscopy (STEM), and Energy Dispersive Spectroscopy (EDS) and Electron Backscatter Scanning Diffraction (EBSD) analysis were used to investigate the effect of martensitic/bainitic packet size. Results show that the increase in the number density of small precipitates in the sample partitioned at 640 °C compensates for the increase in crystallographic packets size. The strength and ductility values are kept at a high level, but the impact toughness will decrease considerably.

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Characterization of rust phases formed on low carbon steel exposed to natural marine environment of Chennai harbour – South India

Materials and Corrosion ◽

10.1002/maco.200704073 ◽

2007 ◽

Vol 58 (11) ◽

pp. 873-880 ◽

Cited By ~ 11

Author(s):

K. V. S. Ramana ◽

S. Kaliappan ◽

N. Ramanathan ◽

V. Kavitha

Keyword(s):

Carbon Steel ◽

Marine Environment ◽

South India ◽

Low Carbon Steel ◽

Low Carbon

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Homology Applied to Characterization of Welded Grain Structures in Low Carbon Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.566.399 ◽

2012 ◽

Vol 566 ◽

pp. 399-405 ◽

Cited By ~ 1

Author(s):

Kazuaki Nakane ◽

Takashi Honda ◽

Edson Costa Santos ◽

Katsuyuki Kida

Keyword(s):

Carbon Steel ◽

Work Organization ◽

Weld Zone ◽

Low Carbon Steel ◽

Low Carbon ◽

Average Amount ◽

Analysis Techniques ◽

Grain Structures ◽

Image Analysis Techniques

In the present work, organization of grains within the weld zone in SS400 low carbon steel is investigated. A classification method based on the concept of topological quantity is proposed to investigate the heat affected zone (HAZ) and the center of the weld metal zone (WMZ). The image of each area includes various grains. By using the conventional image analysis techniques, we can analyze the distribution of its size. However, it is difficult to capture the structure of each. In addition, analyzing each grain does not mean the elucidation of the whole. By calculating the average amount of homology of the grains, we make a distinction in these areas quantitatively.

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