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首页> 外文期刊>Journal of Materials Engineering and Performance >Development and Characterization of Steel Containing Very Fine Ferrite Grains
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Development and Characterization of Steel Containing Very Fine Ferrite Grains

机译：含极细铁素体晶粒的钢的开发与表征

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摘要

Ferrite grain sizes of the order of 1 to 2 um were obtained by optimizing the strain, strain rate, the stage of cooling, as well as the cooling rate during hot rolling of 0.15C-0.92Mn-0.01Si-0.036S-0.04P-0.013Nb steel. It was found that in single-pass rolling of a 10 mm plate to a thickness of 3.5 mm with an entry temperature of 800 °C, and early-stage water cooling, very fine grains of ferrite (1-2 um) were formed at the surface and in subsurface regions. It was also found that the threshold level of reduction during rolling, which is required for the refinement of ferrite grains, is >50 percent. The 3.5 mm thermomechanically processed plate was found to possess very attractive mechanical properties in terms of the yield strength (485 MPa), the ultimate tensile strength (UTS) (763 MPa), and particularly the yield strength to ultimate tensile strength (YS/UTS) ratio (0.63). This combination of properties can be explained on the basis of the composite microstructure consisting of ferrite and bainite that was obtained as a result of the thermomechanical processing.
机译：通过优化0.15C-0.92Mn-0.01Si-0.036S-0.04P的应变，应变速率，冷却阶段以及热轧过程中的冷却速率，可获得1至2 um数量级的铁素体晶粒尺寸-0.013Nb钢。结果发现，在入口温度为800°C的情况下，将10 mm板单道次轧制至3.5 mm的厚度，并进行了早期水冷却，在此温度下形成了非常细的铁素体晶粒（1-2 um）。表面和地下区域。还发现，细化铁素体晶粒所需的轧制过程中还原的阈值水平> 50％。发现3.5毫米热机械加工的板材在屈服强度（485 MPa），极限抗拉强度（UTS）（763 MPa），特别是屈服强度对极限抗拉强度（YS / UTS）方面具有非常吸引人的机械性能）比率（0.63）。可以基于由热机械加工获得的由铁素体和贝氏体组成的复合微观结构来解释这种性能组合。

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