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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >Physical Simulation and Analysis of the Hot Workability of a New Powder Metallurgical 'Micro-Clean' HS-Steel Grade
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Physical Simulation and Analysis of the Hot Workability of a New Powder Metallurgical 'Micro-Clean' HS-Steel Grade

机译：新型粉末冶金“微清洁” HS钢的热加工性的物理模拟和分析

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摘要

To increase the hot forming process capability and the quality of powder metallurgically produced "micro clean"-HSS grades it is indispensable to understand the relevant microstructural phenomena during the forming process. With this objective, numerical flow curve models and processing maps have been applied to describe the workability and the microstructural evolution during the deformation of a new powder metallurgically produced HSS grade in an as-hipped start condition. The routines which describe the deformation behavior are based on experimentally determined flow curves in the strain rate range of 0.01 to 100 /s and at temperatures between 900 and 1150℃. In this special case of a matrix-particle composite structure the flow stress with respect to strain rate does not obey the classical power law over the full process-relevant strain rate range. So a detailed analysis of the work-hardening and dynamic softening behavior together with the corresponding efficiency of power dissipitation and the appearance of flow instabilities make an understanding of the metallurgically relevant changes in the microstructure possible. In addition, microstructural observations of deformed specimens could explain the damage mechanism inside regions of flow instabilities and flow localization by pore formation and interfacial cracking at temperatures which are too high or too low. For high strain rates, such as occur during the final sequences of rod rolling, the "speed limit" regarding critical flow localization with short time overheating in the areas surrounding particle clusters could be derived as an important process control parameter.
机译：为了提高热成型工艺的能力和冶金生产的“微清洁” -HSS粉末粉末的质量，必须了解成型过程中的相关微观结构现象。出于这个目的，数值流曲线模型和加工图已被用于描述在刚开始时以冶金方式生产的新型粉末HSS牌号的变形过程中的可加工性和微观组织演变。描述变形行为的程序是基于实验确定的，在0.01至100 / s的应变速率范围内，在900至1150℃之间的温度下的流动曲线。在基质-颗粒复合结构的这种特殊情况下，在与过程相关的整个应变速率范围内，关于应变速率的流应力未遵循经典幂律。因此，对工作硬化和动态软化行为的详细分析以及相应的功率耗散效率和流动不稳定性的出现，使人们有可能了解微观组织中与冶金相关的变化。另外，变形样品的微观结构观察可以解释在太高或太低的温度下，由于孔的形成和界面裂纹所致的流动不稳定性和流动局部化区域内部的破坏机理。对于高应变率，例如在棒材轧制的最后顺序中发生的情况，有关临界流局部化和短时间过热的“速度极限”在颗粒团簇周围的区域中可以作为重要的过程控制参数得出。

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