Description of short time phase transformations during the heating of steels based on high-rate experimental data
Description of short time phase transformations during the heating of steels based on high-rate experimental data
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基于高速实验数据描述钢加热过程中的短时相变
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
D. Löhe
中科院分区：
文献类型：
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作者：
T. Miokovic;J. Schwarzer;V. Schulze;O. Vöhringer;D. Löhe
在钢的表面硬化（如激光硬化）过程中，材料会发生快速的热变化。这些硬化过程的建模允许确定受影响区域内的随时间变化的温度场和相变。虽然有许多研究在冷却过程中的转变行为，有一个缺乏有关的数据，在加热过程中，在非常高的加热速率的转变。因此，模拟快速温度变化的实验是必要的，以实现在硬化过程中的短时间相变的影响到模拟。本文介绍了加热速率高达10000 K/s对AISI 4140钢（德国牌号42 CrMo 4）奥氏体化行为的影响，并用Avrami函数进行了描述。所获得的结果总结在连续加热的时间-温度-转变图和等温时间-温度-转变图中，其可用作模拟的输入数据。
During surface hardening of steels like laser hardening, rapid thermal changes are imposed to the material. The modelling of these hardening processes allows the determination of time-dependent temperature fields and phase transformations within the affected zones. While there are many investigations on the transformation behaviour during cooling, there is a lack of data concerning the transformation during heating at very high heating rates. Therefore, experiments simulating the fast temperature changes are necessary to implement the effects of short time phase transformation during hardening into simulation. In this paper the effect of heating rates up to 10000 K/s on the austenitizing behaviour of the steel AISI 4140 (German grade 42CrMo4) are presented and described using an Avrami-function. The results obtained are summarized in time-temperature-transformation diagrams for continuous heating and isothermal time-temperature-transformation diagrams which may be used as input data for the simulation.