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Effects of Nb on Microstructure and Property of09CuPRE Weathering Resistant Steel

Author: BoFanChao
Tutor: DongFang
School: Inner Mongolia University of Science and Technology
Course: Iron and steel metallurgy
Keywords: Nb 09CuPRE weathering steel Microscopic structure Mechanicalproperty Corrosion resistance
CLC: TG142.7
Type: Master's thesis
Year: 2013
Downloads: 11
Quote: 0
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Abstract


Weathering steel is the high strength and low alloy steel added small amounts of alloyelements which has strong corrosion resistance capability, and the09CuPRE weatheringsteel is one of the traditional weathering resistance steel grades. Through the addedelement of niobium in the09CuPRE weathering steel studied the influence law ofmicrostructure, mechanical and corrosion properties. For weathering steel has certainguiding significance to the promotion of comprehensive performance.This study through the tensile test at room temperature, impact test, hardness test andsimulated industrial atmospheric environmental cycle corrosion test, and by means of Zeissmetallographic microscope and laser confocal microscope scanning electron microscopy,X-ray diffractometer and electrochemical analysis instrument systematically tested theniobium on the09CuPRE weathering steel organization and performance. Through themechanical test results, weeks leaching test weightlessness data, electrochemicalpolarization curve and impedance spectroscopy data of the comprehensive analysis, thefollowing conclusions:Niobium drags through the solid solution of niobium and niobium carbon nitrogenprecipitated phase at the grain boundary pinning effect increases the nucleation rate oforganization, inhibits the grain growth and makes grains refine and uniform. With theincrease of niobium content, organization refinement is obvious.Adding the right amount of niobium, through the common role of fine-grainstrengthening and precipitation strengthening, makes the steel yield strength and tensilestrength increase significantly, the yield strength increases slightly greater than the tensilestrength. When niobium content is0.051%, the yield strength and tensile strength reachesmaximum, respectively is383.19MPa and496.11MPa; the addition of niobium can greatlyimprove the plastic property of09CuPRE weathering steel, when the niobium content is 0.051%, the plastic at best, tensile fracture toughness nests are small and uniform, showingthe characteristics of good plasticity. With the increase of niobium content, impacttoughness of steel at-20℃and25℃increases first and then decreases, when the niobiumcontent is0.032%, respectively reaching maximum impact energy at126J and218J. Withthe addition of niobium elements,09CuPRE weathering steel hardness increases gradually.With the increase of niobium content in steel,09CuPRE corrosion resistance ofweathering steel is improved, Niobium element significantly reduces corrosion rate, andpromotes the stability of the generation of rust layer. When niobium content added in thetest range is0.073%,09CuPRE has the best corrosion resistance.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Special performance of steels
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