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首页> 外文会议>Journal of Iron and Steel Research, International >Refinement of Steel Austenite Grain Under an Extremely High Degree of Superheating
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Refinement of Steel Austenite Grain Under an Extremely High Degree of Superheating

机译：极高过热度下钢奥氏体晶粒的细化

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There thermal cycles for the cyclic heat treatment of a bainitic steel were simulated under the different heating rate ranged from 2 °C/s to 100 °C/s and 1000 °C/s followed by subsequent rapid cooling using a Gleeble3500thermal-mechanical simulator equipped with the self-designed quench system. The microstructural change of the starting material imposed by the different thermal cycles was observed by optical and transmission electron microscope (TEM). The results indicate that a high degree of superheating for the reverse bainitic α→γ transformation was realized as a result of extremely rapid heating (1000 °C/s) up to an elevated austenitisation temperature (1250°C), which prevent restoration of the initial coarse-grained austenite and lead to a significant refinement of austenite grain. An ultrafine-grained structure with enhanced mechanical properties then formed during the subsequent rapid γ→α reaction on cooling. The results indicate a novel microstructure refinement route for the bainitic steels.
机译：模拟了贝氏体钢在2°C / s至100°C / s和1000°C / s的不同加热速率下进行循环热处理的热循环，随后使用配备的Gleeble3500热机械模拟器进行快速冷却自行设计的淬火系统。通过光学和透射电子显微镜（TEM）观察到由不同的热循环引起的原材料的微观结构变化。结果表明，由于极快的加热速度（1000°C / s）到升高的奥氏体化温度（1250°C），实现了贝氏体反向α→γ转变的高度过热，从而阻止了奥氏体的恢复。初始的粗晶粒奥氏体并导致奥氏体晶粒的显着细化。然后，在随后的冷却中快速的γ→α反应过程中，形成了具有增强的机械性能的超细晶粒结构。结果表明，贝氏体钢有新的组织细化途径。

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