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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Effect of Composition and Austenite Deformation on the Transformation Characteristics of Low-Carbon and Ultralow-Carbon Microalloyed Steels
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Effect of Composition and Austenite Deformation on the Transformation Characteristics of Low-Carbon and Ultralow-Carbon Microalloyed Steels

机译：成分和奥氏体变形对低碳和超低碳微合金钢的相变特性的影响

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摘要

Deformation dilatometry has been used to simulate controlled hot rolling followed by controlled cooling of a group of low- and ultralow-carbon microalloyed steels containing additions of boron and/or molybdenum to enhance hardenability. Each alloy was subjected to simulated recrystallization and nonrecrystallization rolling schedules, followed by controlled cooling at rates from 0.1 deg C/s to about 100 deg C/s, and the corresponding continuous-cooling-transformation (CCT) diagrams were constructed. The resultant microstructures ranged from polygonal ferrite (PF) for combinations of slow cooling rates and low alloying element contents, through to bainitic ferrite accompanied by martensite for fast cooling rates and high concentrations of alloying elements. Combined additions of boron and molybdenum were found to be most effective in increasing steel hardenability, while boron was significantly more effective than molybdenum as a single addition, especially at the ultralow carbon content. Severe plastic deformation of the parent austenite (>0.45) markedly enhanced PF formation in those steels in which this microstructural constituent was formed, indicating a significant effective decrease in their hardenability. In contrast, in those steels in which only nonequilibrium ferrite microstructures were formed, the decreases in hardenability were relatively small, reflecting the lack of sensitivity to strain in the austenite of those microstructural constituents forming in the absence of PF.
机译：变形膨胀法已用于模拟受控热轧，然后受控冷却一组含硼和/或钼的低碳和超低碳微合金钢，以增强淬透性。对每种合金进行模拟的重结晶和非重结晶轧制计划，然后以0.1℃/ s至约100℃/ s的速率进行受控冷却，并绘制了相应的连续冷却转变（CCT）图。最终的微观结构从用于慢速冷却和低合金元素含量的多边形铁素体（PF）到伴随快速冷却速率和高合金元素浓度的马氏体伴生的贝氏体铁素体。硼和钼的混合添加被发现对提高钢的淬透性最有效，而硼作为单一添加比钼显着更有效，特别是在碳含量超低的情况下。母体奥氏体的严重塑性变形（> 0.45）在形成这种微结构成分的钢中显着增强了PF的形成，表明淬透性显着有效降低。相反，在仅形成非平衡铁素体微结构的那些钢中，淬透性的降低相对较小，这反映出在没有PF的情况下形成的那些微结构成分对奥氏体缺乏应变敏感性。

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