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首页> 外文会议>Understanding microstructure : Key to advances in materials >Heat Treatment Response of a Grain Refined C-Mn Steel Obtained by Controlled Rolling: Structure and Properties
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Heat Treatment Response of a Grain Refined C-Mn Steel Obtained by Controlled Rolling: Structure and Properties

机译：通过控制轧制获得的晶粒细化的C-Mn钢的热处理响应：组织和性能

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摘要

The present work shows the possibility of obtaining very fine ferritic grains in an ordinary C-Mn steel without the addition of microalloying elements such as Ti, Nb, and V. The ferrite grain size is similar to that obtained in microalloyed steels when conventional controlled rolling techniques are applied. The combination of the microstructural features such as the cnventional static recrystallization during the roughing passes and the occurence of dynamic recrystallization in the last passes of the finishing period in the semi-continuous mill are essential keys when very fine gamma grains are sought. Special attention must be paid to the process variables such as strain, strain rate, interpass time and temperature, to avoid the formation of duplex structures which have proved to be very deleterious to the mechanical properties, in particular to the toughness. Thereafter the cooling process must be carefully monitored to avoid the formation of non-equilibrium phases. Finally to keep the structure of small equiaxed ferritic grains down to room temperature, the application of accelerated cooling and a low temperature coiling of the strip will maximize the properties of the material. The reheating trials conducted in the as rolled steel at temperature over A_r3, simulating the HAZ of a weld, have shwn the tendency to coarsening of the austenite, leading to the formation of Widmanstaetten ferrite after cooling in air.
机译：目前的工作表明，在不添加诸如Ti，Nb和V之类的微合金元素的情况下，在普通C-Mn钢中获得非常细的铁素体晶粒的可能性。铁素体晶粒尺寸与常规控制轧制时在微合金钢中获得的晶粒尺寸相似。技术的应用。当寻求非常细的γ晶粒时，微观结构特征的组合，例如在粗加工道次中的常规静态再结晶和在半连续轧机中在精加工阶段的最后道次中发生动态再结晶是至关重要的关键。必须特别注意工艺变量，例如应变，应变率，道次时间和温度，以避免形成已被证明对机械性能（特别是韧性）非常有害的双相结构。此后，必须仔细监控冷却过程，以避免形成非平衡相。最后，为了使小等轴铁素体晶粒的结构保持在室温下，带钢的加速冷却和低温卷取将使材料的性能最大化。在A_r3以上的温度下对轧制钢进行的再加热试验（模拟焊缝的热影响区）显示出奥氏体粗大化的趋势，导致在空气中冷却后形成Widmanstaetten铁素体。

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