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STUDY OF STRENGTHENING MECHANISMS IN V -N STEELS

机译：V-N钢强化机理的研究。

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The transformation and strengthening behavior of a series of V -N steels during Hot Strip Mill (HSM) simulation was investigated. Of particular interest in this study was the examination of the 㬰 to 㬐 transformation and the precipitation that takes place during cooling from the finishing rolling temperature to the temperatures reached at the end of the run -out-table (ROT) and during co iling. To clearly distinguish, quan tify, and separate the transformation and precipitation behavior that takes place on the ROT and during coiling, two distinct thermal paths were used;continuous and discontinuous. The continuous cooling thermal path is characterized by the complete proces s, i.e., hot rolling followed by ROT cooling followed by cooling in the coil to room temperature (RT) at 30°C/h. In the discontinuous path, the samples were water quenched (WQ) to RT after reaching the coiling temperature. The transformation and the precip itation behavior were evaluated with standard electron optic techniques, Orientation Imaging Microscopy (OIM) and Image Quality (IQ) analysis. In addition, transmission electron microscopy (TEM)/scanning TEM (STEM ) and atom probe tomography (APT) were used to evaluate the precipitation behavior. The results of this study clearly rev ealed that a) the kinetics and transformation temperature of the 㬰 to 㬐 transformation behavior are strongly influenced by the N content of the steel;b) the majority of the 㬰 to 㬐 transformation takes place on the ROT, while the rest takes place during coiling;c) the volume fraction and the nature of the ferrit e (polygonal versus non -polygonal) depends on the steel composition and the coiling temperature;d) the type and extent of precipitation behavi or was related to the coiling temperature and the nature of the ferrite formed prior to coiling. The results of this study indicated that the major strengthening mechanisms observed and quantified were related primarily to solid solution strengthening, the average polygonal ferrite grain size, the dislocation density associated with the nature of the non -polygonal fe rrite, and to a lesser extent precipitation.
机译：研究了一系列V -N钢在热轧机（HSM）模拟过程中的相变和强化行为。在这项研究中特别感兴趣的是检查从㬰到㬐的转变以及在从终轧温度冷却到跳动台（ROT）末期和卷取过程中达到的温度期间发生的沉淀。为了清楚地区分，量化和分离在ROT上以及在​​卷取过程中发生的转变和沉淀行为，使用了两种不同的热路径：连续和不连续。连续冷却热路径的特征在于完整的过程，即热轧，然后进行ROT冷却，然后在盘管中以30°C / h的速度冷却至室温（RT）。在不连续路径中，在达到卷取温度后，将样品用水淬火（WQ）至室温。使用标准电子光学技术，定向成像显微镜（OIM）和图像质量（IQ）分析评估了相变和沉淀行为。此外，透射电子显微镜（TEM）/扫描TEM（STEM）和原子探针层析成像（APT）用于评估沉淀行为。这项研究的结果清楚地表明，a）㬰到㬐转变行为的动力学和转变温度受钢中氮含量的强烈影响； b）㬰到㬰转变的大部分发生在ROT上， c）铁素体e的体积分数和性质（多边形对非多边形）取决于钢的成分和卷取温度; d）析出行为的类型和程度，或与卷取温度和卷取前形成的铁素体的性质。研究结果表明，观察到并量化的主要强化机制主要与固溶强化，多边形铁素体平均晶粒尺寸，与非多边形铁素体性质有关的位错密度以及较小程度的降水有关。 。

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