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首页> 外文会议>Annual technical meeting of the International Metallographic Society >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：通过受控轧制获得的晶粒精制C-Mn钢的热处理响应：结构和性能

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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 conventional 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 temperatures over Ar3 , simulating the HAZ of a weld, have shown the tendency to coarsening of the austenite, leading to the formation of Widmanstatten ferrite after cooling in air.
机译：本作者表明，在普通的C-Mn钢中获得非常精细的铁素体晶体，而不会加入如Ti，Nb和V的微合金元素。铁氧体晶粒尺寸类似于当常规控制轧制时在微合金钢中获得的物质。应用技术。在粗加工过程中诸如传统的静态重结晶期间的微观结构特征的组合以及半连续磨机中精加工时段的最后一次通过的动态再结晶的发生是当寻求非常细的伽马颗粒时的基本键。必须特别注意流程变量，如应变，应变率，接口时间和温度，以避免形成双相结构，这已经证明已经对机械性能非常有害，特别是韧性。此后必须仔细监测冷却过程以避免形成非平衡阶段。最后要将小型等轴的铁素体晶体保持下来至室温，加速冷却的施加和条带的低温卷积将最大化材料的性质。在AR3上的温度下，在AS轧制钢中进行再加热试验，模拟焊缝的HAZ，表明奥氏体粗化的趋势，导致在空气中冷却后形成WidmanStatten铁氧体。

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