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首页> 外文会议>Pacific Rim International Conference on Advanced Materials and Processing(PRICM 5) pt.1; 20041102-05; Beijing(CN) >Evolution of Microstructures in a Low Carbon Bainitic Steel during Reheating
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Evolution of Microstructures in a Low Carbon Bainitic Steel during Reheating

机译：低碳贝氏体钢再加热过程中组织的演变

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摘要

Cooled in water after isothermal relaxation of deformed austenite for different time, a Nb-bearing microalloyed steel always exhibited synthetic microstructures of bainitic ferrite, granular bainite and acicular ferrite. When these samples were reheated to and held at 650℃ or 700 ℃, the non-equilibrious microstructures tended to evolve into equilibrious ones, accompanied by obvious change of hardness. The rate of microstructures evolution was closely related to relaxation time of deformed austenite. The sample relaxed for 60s displayed the highest thermal stability, while microstructure evolution was quickest in the sample relaxed for 1000s even though it was softest before reheating. By hardness measurement, it was found that softening was not only process occurring during reheating, in which hardness fluctuated with time. There were two peaks in hardness-time curve of each sample having undergone relaxation, while single peak occurred in the curve of the sample not being relaxed. These results indicate that thermal stability of microstructures is determined by their history of formation.
机译：含铌微合金钢在变形奥氏体等温弛豫不同时间后在水中冷却，总是表现出贝氏体铁素体，粒状贝氏体和针状铁素体的合成组织。当这些样品再加热到650℃或700℃并保持其温度时，不平衡的显微组织趋向于演变成平衡的组织，并伴有明显的硬度变化。显微组织的演化速率与变形奥氏体的弛豫时间密切相关。松弛60s的样品表现出最高的热稳定性，而松弛1000s的样品的微观结构演变最快，即使在重新加热之前最软。通过硬度测量，发现软化不仅发生在再加热期间的过程中，在该过程中硬度随时间波动。经历松弛的每个样品的硬度-时间曲线中有两个峰，而没有松弛的样品的曲线中出现一个峰。这些结果表明，微结构的热稳定性取决于它们的形成历史。

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