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Isothermal Growth Kinetics of Ultra-fine Austenite Grains in a Nb-V-Ti Microalloyed Steel

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Journal of Materials Science & Technology 2009年第5期25卷 615-618页

作者： shengjie yao linxiu du xianghua liu guodong wang State Key Lab. of Rolling and Automation Northeastern University Shenyang 110004 China

Ultra-fine austenite grains with size of i-3 μm were prepared in a Nb-V-Ti steel through repetitive treatment of rapid heating and quenching. A model for the growth kinetics of these ultra-fine austenite grains was successfully created through successive 2 processes, and the activation energy Q for growth was estimated to be about 693.2 kJ/mol, which directly shows the inhibition effect of microalloy elements on the growth of ultra-fine austenite grains.

关键词： Ultra-fine austenite grain Grain growth kinetics Microalloyed steel

A New Attempt to Obtain Bulk Nanocrystalline Steel

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Journal of Materials Science & Technology 2009年第1期25卷 81-84页

作者： shengjie yao linxiu dut xianghua liu guodong wang The State Key Lab. of Rolling Technology and Automation Northeastern University Shenyang 110004 China

Bulk nanocrystalline steel sample was obtained in laboratory through refining of austenite grains and controlled rolling. Transmission electron microscopy micrographs show that some textures are evolved in the process of the treatment and two typical carbides are classified according to their size and location. The tensile strength of the nanocrystalline sample is obviously lower than conventional consideration, and scanning electron microscopy observation shows that the existence of the first type of carbide is considered as the main reason for the failure.

关键词： Bulk Nanocrystalline Deformation Carbide Fracture

Fabrication and Microstructural Control of Nano-structured Bulk Steels: A Review

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 508-520页

作者： linxiu du shengjie yao Jun Hu Huifang Lan Hui Xie guodong wang State Key Laboratory of Rolling and Automation Northeastern University School of Materials Science and Engineering Harbin Institute of Technology at Weihai

There exist strong interests of developing nano-grained steels because of the outstanding properties including high strength/weight ratio, wear resistance, excellent toughness, and favorable cellular activity. This article reviews the main fabrication process and microstructural control of nano-structured steels over the last decades. Severe plastic deformation is considered as an effective route of obtaining the nano-grained microstructures. The process of cold-rolling and annealing of martensitic steel is a viable method to obtain bulk nano-structured low carbon steel, while the final thickness of the cold-rolling plate is limited. According to the theoretical results of the thermal simulation studies, a novel alloy design combined with the rapid transformation and rolling process is proposed to successfully fabricate nano-grained high strength bulk steel. The refinement mechanisms are expected to be taking advantage of increase in the transformation nucleation sites and inhibiting the grain coarsening. Moreover, corresponding mechanical properties are summarized.

关键词： Nano-structured steel SPD Cold-rolling and annealing martensite RTRP Transformation mechanism Mechanical properties

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超细晶奥氏体在两相区大变形后的瞬态组织

材料研究学报 2008年第6期22卷 572-576页

作者：姚圣杰杜林秀刘相华王国栋东北大学轧制技术及连轧自动化国家重点实验室沈阳110004

将一种低碳结构钢循环加热淬火得到超细晶粒奥氏体,再以20℃/s的速率将其冷却至两相区进行真应变量为2的大变形,分析了形变后的瞬态组织.结果表明:用该工艺制备的超细晶奥氏体在两相区的高速大变形的后期,始终呈现应变硬化特征,并伴随... 详细信息

将一种低碳结构钢循环加热淬火得到超细晶粒奥氏体,再以20℃/s的速率将其冷却至两相区进行真应变量为2的大变形,分析了形变后的瞬态组织.结果表明:用该工艺制备的超细晶奥氏体在两相区的高速大变形的后期,始终呈现应变硬化特征,并伴随有一定程度的形变诱导相变或铁素体动态再结晶等软化行为;同时,在较低温度快速大变形容易在试样的个别碳过饱和区导致应变诱导孪晶马氏体组织的生成,且随着形变温度降低孪晶马氏体量增加-循环加热淬火前的原始组织影响奥氏体内碳浓度分布,在一定程度上影响冷却变形过程的应力应变行为和形变后的瞬态组织.

关键词：金属材料轧制超细晶奥氏体两相区大变形孪晶马氏体

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利用相变进行低碳钢的亚微米化

金属学报 2007年第1期43卷 59-63页

作者：杜林秀熊明鲜姚圣杰刘相华王国栋东北大学轧制技术及连轧自动化国家重点实验室沈阳110004

以低碳微合金钢为对象,提出了一种利用相变进行亚微米化的新方法．通过大变形量温变形和循环淬火相结合的方法,使奥氏体晶粒细化到1—2μm．在一般冷速的连续冷却条件下,得到的铁索体粒径接近或超过原奥氏体晶粒;若冷却过程中在Ar3点以... 详细信息

以低碳微合金钢为对象,提出了一种利用相变进行亚微米化的新方法．通过大变形量温变形和循环淬火相结合的方法,使奥氏体晶粒细化到1—2μm．在一般冷速的连续冷却条件下,得到的铁索体粒径接近或超过原奥氏体晶粒;若冷却过程中在Ar3点以下施加较大的变形,则可以获得尺寸为0．1-0．μm的亚微米级铁素体组织．大变形量的温变形使得原始组织中碳化物分布均匀,促进了加热过程中碳化物的溶解及超细奥氏体晶粒的形成;晶界滑动促进奥氏体的晶界形核可能是超细奥氏体形变诱导相变的主要机制．

关键词：低碳钢亚微米化相变变形晶粒细化