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Microstructural and corrosion resistance of HSLA X70 welded pipeline subjected to successive repairs

Auteurs : B. MAAMACHE, B. Cheniti, Y. YAHMI
Année : 2016
Domaine : Sciences des matériaux
Type : Communication
Conférence: 4th International Conference Recent Trends in Structural Materials
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Mots clés : HSLA X 70 steel, successive weld repairs, Heat affected zone, corrosion resistance

Résumé :

The aim of this work is to study the influence of successive weld repairs on the microstructure, the mechanical properties and the corrosion resistance of the weldment of an HSLA X70 steel. Detailed microstructural examination combined to grain size measurement showed that beyond the second weld repair, the microstructure of the HAZ undergoes significant change in the grain morphology and grain growth. Consequently, a loss of the mechanical properties namely the yield strength and the toughness with the number of the weld repairs was recorded. Potentiodynamic polarization tests of different weld repair were evaluated at 0.1M in NaCl solution. Beyond the second weld repair the corrosion resistance decrease due to the formation of martensite-austenite (M-A) and bainitic structures.