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Annealing Response of Cold-Rolled Vanadium Microalloyed Sheet Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 404-411页

作者： John G Speer david k.matlock Robert J Glodowski A dvanced Steel Processing and Products Research Center Colorado School of MinesGoldenColorado USA East Metals (North America) LLCPittsburghPAUSA

Vanadium microalloying is widely employed in hot-rolled HSLA products;because of its relatively high solubility in austenite,vanadium plays a special role in thin-slab cast hot-rolled products where reheating is limited prior to *** cold-rolled and annealed sheet steels,vanadium technology has been employed in bake-hardenable drawing-quality steels,and in HSLA *** studies have investigated the continuous and batch annealing response of vanadium-containing cold-rolled HSLA steels,with an emphasis on aluminum and nitrogen variations (because of the special importance of nitrogen in vanadium microallyed steels,and interesting interactions between vanadium,aluminum and nitrogen).The present contribution reviews some key aspects of vanadium-microalloyed coldrolled sheet steels,and highlights the results of selected studies showing the influence of steel composition and processing.

关键词： Microalloying vanadium,bake-hardening cold rolled sheet steel

Nb-Microalloying in Next-Generation Flat-Rolled Steels

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Nb-Microalloying in Next-Generation Flat-Rolled Steels

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： SPEER John G ARAUJO Ana L matlock david k DE MOOR Emmanuel Advanced Steel Processing and Products Research Center Colorado School of Mines

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 *** 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.

关键词： niobium high strength steel Q&P sheet plate

来源： cnki会议评论

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Q&P钢热处理工艺的开发进展(英文)

世界钢铁 2009年第1期9卷 31-35+39页

作者： John G Speer david k.matlock 科罗拉多矿业学院先进钢工艺和产品研发中心

Q&P钢的工艺概念已提出了有些年了,它作为一种热处理工艺,生产的组织具有马氏体和富C的亚稳残余奥氏体。工艺包括:控制淬火形成部分的马氏体,然后热处理以使C从过饱和的马氏体中转移到残余奥氏体中。潜在的应用包括具有好的成型性和抗... 详细信息

Q&P钢的工艺概念已提出了有些年了,它作为一种热处理工艺,生产的组织具有马氏体和富C的亚稳残余奥氏体。工艺包括:控制淬火形成部分的马氏体,然后热处理以使C从过饱和的马氏体中转移到残余奥氏体中。潜在的应用包括具有好的成型性和抗断裂的高强度钢。应用该工艺可生产薄板和厚板,以及用从长锻材生产热处理元件,甚至于铸铁。自2003年一直在实验室研究,早期的工作结果已有发表。近期的研究主要集中于机理方面的细节。国际范围的独立团队在此研究领域也有很多进展。

关键词： quenching partitioning retained austenite

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汽车用钢的最新研究进展

世界钢铁 2013年第5期13卷 48-54页

作者： John G Speer david k.matlock Emmanuel de Moor Grant A Thomas 周澍科罗拉多矿校

为满足提高燃油效率及汽车"轻量化"等方面持续的需求,学术界及工业领域一直都很重视钢铁及其替代材料的研发,这两类材料之间的竞争始终十分激烈。对汽车用钢在北美的研究现状进行了概述,并重点介绍了几种冷轧和热轧汽车用钢的研究进展... 详细信息

为满足提高燃油效率及汽车"轻量化"等方面持续的需求,学术界及工业领域一直都很重视钢铁及其替代材料的研发,这两类材料之间的竞争始终十分激烈。对汽车用钢在北美的研究现状进行了概述,并重点介绍了几种冷轧和热轧汽车用钢的研究进展及其生产情况。新一代先进高强钢的发展将依然令人关注并充满机遇。

关键词： AHSS Q&P钢中Mn钢 TRIP钢 TWIP钢纳米结构钢热冲压钢

Ultra-high strength sheet steel property developments

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Baosteel Technical Research 2010年第S1期4卷 45-页

作者： John G SPEER Emmanuel De MOOR david k.matlock Advanced Steel Processing and Products Research Center Colorado School of Mines GoldenCO80401USA

Conventional advanced high strength steels(AHSS) such as dual-phase,TRIP and martensitic sheet products have undergone extensive development and substantially increased implementation in automobile structures over the past few *** are now underway to extend these improvements and develop steels with even greater strengths and formability.A variety of alloy/process/microstructure/property approaches aimed at next generation AHSS properties are highlighted *** approach involves the quenching and partitioning process,originally conceived at the Colorado School of Mines,but now being investigated around the global automotive steel development *** implementation efforts are underway,and new results demonstrate the capability to obtain ultra-high strength levels with usable *** the field more broadly,it appears that several approaches are converging,and it is likely that additional attention will continue to be placed on expanding the allowable range of austenite stabilizing elements.

关键词： AHSS sheet steel Q & P

Development of microalloyed steels for high temperature carburizing

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Baosteel Technical Research 2010年第S1期4卷 86-页

作者： david k.matlock John G SPEER Steven G JANSTO Marcos STUART Advanced Steel Processing and Products Research Center Colorado School of Mines GoldenColorado USA CBMM-Reference Metals Bridgeville PA CBMM Sao Paulo Brasil

The potential for use of microalloy additions to suppress abnormal austenite grain growth and produce steels with enhanced bending fatigue resistance after high temperature vacuum carburizing was investigated in a series of Ti-modified SAE 8620 steels with w(niobium) additions up to 0.1%.Results are considered from a series of papers at the Advanced Steel Processing and Products Research Center on the effects of Nb content,heating rate, rolling history,and processing temperature on the evolution of austenite grain structures in carburizing steels. Emphasis is placed on understanding the effects of alloying and processing on each stage in the annealing process including the as received laboratory rolled conditions,during the onset of carburizing after annealing at different heating rates,and after annealing for various times at carburizing temperatures up to 1 100℃.Heating rate to the carburizing temperature was shown to be an influential variable and suppression of abnormal grain growth was dependent on the development of a critical distribution of fine NbC precipitates,stable at the austenitizing *** importance to industrial carburizing practice of heating rate effects on precipitates and austenite grain size evolution are discussed and correlated to selected data on fatigue performance.

关键词： heat treating microalloying carburizing niobium abnormal grain growth