Nb-Microalloying in Next-Generation Flat-Rolled Steels
Extensive efforts are underway worldwide to develop new steels with substantial fractions of retained austenite,for lightweight automobile manufacturing and other applications requiring improved combinations of strength and formability.It is likely that microalloying can provide product enhancements in these emerging products,such as Q&P,TBF,medium-Mn TRIP,etc.And this paper examines the expected behavior of niobium using inferences based on published AHSS literature and principles of Nbmicroalloying.Some benefits of Nb in terms of microstructure refinement and precipitation strengthening have been reported,and increased retained austenite levels are shown here in Q&P hot-rolling simulations.The potential influences of Nb are complex due to the sensitivity of Nb dissolution and precipitation to chemical composition and processing; differences in the expected role of Nb are pointed out with respect to different product forms produced via hot-rolling or annealing after cold-rolling,and microstructures with or without substantial quantities of primary ferrite.Some issues that warrant further examination are identified,as a deep understanding of Nbmicroalloying and other fundamental behaviors will be needed to optimize the performance of these next-generation steels.
niobium high strength steel Q&P sheet plate
SPEER John G ARAUJO Ana L MATLOCK David K DE MOOR Emmanuel
Advanced Steel Processing and Products Research Center,Colorado School of Mines,1500 Illinois St.,Golden,Colorado,80401,USA
国内会议
上海
英文
1-7
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）