An Investigation On External Corrosion Of Tempered Dual Phase Steel Welded Plate In NaCI Solutions

Sapani, Fatin Munirah (2016) An Investigation On External Corrosion Of Tempered Dual Phase Steel Welded Plate In NaCI Solutions. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The upgrading of new steel that has stronger properties is needed to make sure the enhancement of industry development nowadays. According to the situation, dual phase steel is another substitute to low carbon steel because of its characteristics of low yield strength, excellent elongation, and good formability. Therefore, the effect of quenching and tempering process on the microstructure, hardness and corrosion rate of carbon dual-phase steel has been studied. The low carbon steel has been intercritically annealed at 800°C and 850°C followed by rapid water quenching to get different microstructure of martensite and matrix ferrite. The dual phase steel then tempered in the range of 200-400°C. This study also investigates the corrosion rate of welded of dual phase steel in 3.5% concentration of NaCl solution. The method of welding that used in this study was Shielded metal arc welding (SMAW) technique. The hardness and weight loss of metal is measured and the microstructure of dual phase steel is investigated by using Optical microscope and Scanning electron microscopy (SEM).This study has shown that the hardness and corrosion rate increase after annealing and quenching process while the ductility and the c01lrosion resistance increase after tempering process. The corrosion rate of the dual phase steel depends on the volume of martensite, which is the dual phase steel that through the heat treatment by the annealing process at 850°C (850DPS) has the higher corrosion rate than the dual phase steel annealed at 800 °C (800DPS).

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