Direct and Indirect Benefits of Niobium Microalloying to Automotive Sheet Steel
Automotive sheetsteel grade cover today a wide range of properties from very soft grades with highest formability to extremely strong grades being very difficult to form.In the same respect the carbon content ranges from nearly zero in interstitial-free steel up to 0.35% in the strongest press hardening steel.In the widely used HSLA steel grades the addition of carbon is mediated against microstructural optimization with the aim of obtaining high strength steel having acceptable formability and weldability.Niobium microalloying has been established in these steels as the most efficient element for obtaining grain refinement and precipitation strengthening.Furthermore,niobium acts as a carbon stabilizer to provide steel with an interstitial-free matrix.These well-known direct metallurgical benefits of niobium are complemented by several less-known indirect effects bringing substantial benefits for either processing the steel in the mill or improving particular properties of the steel.Examples of such indirect benefits are texture control,phase transformation kinetics,stabilization of properties or hydrogen trapping.Accordingly,this paper will comprehensively explain the currently understood effects of niobium relevant to the production and properties of automotive sheet steel.
MOHRBACHER Hardy
NiobelCon bvba, 2970 Schilde, Belgium
国际会议
成都
英文
341-344
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）