The effect of Ni content (wNi = 0.2 %, 0.53 %, 0.8 %, 1.11 %) on microstructure and mechanical properties was investigated. Results show that low content leads to 'ferrite and martensite' microstructure with coarse grain size. With increasing Ni content, more acicular ferrite is obtained at the expense of polygonal ferrite. M/A island is more finely distributed. And the precipitate mode from the interphase precipitation changes to the uniform dispersion of precipitation with decreased size. Both yield strength and tensile strength monotonously increase with the Ni content. The elongation first increases and then decreases, while the ductile-brittle transition temperature responses in an opposite way. The steel with 0.5 % - 0.83 % Ni yields the best low temperature toughness.
Effect of Ni content on microstructure and mechanical properties of offshore platform steel
Einfluss des Ni-Gehalts auf die Mikrostruktur und die mechanischen Eigenschaften auf den Offshore-Plattform-Stahl
Journal of Iron and Steel Research (Chinese Edition) ; 24 , 6 ; 52-56
2012
5 Seiten, 5 Bilder, 1 Tabelle, 11 Quellen
Article (Journal)
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