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首页> 外文期刊>Journal of Materials Research and Technology >Influences of impact energy on the densification and mechanical properties of powder metallurgical Fe–C–Cu preforms during a powder-forged process
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Influences of impact energy on the densification and mechanical properties of powder metallurgical Fe–C–Cu preforms during a powder-forged process

机译：粉末锻造过程中粉末冶金Fe-C-Cu预成型件对粉末冶金Fe-C-Cu预成型件的致密化和力学性能的影响

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Accurate impact energy control is important for the success of the powder-forged (P/F) technique. This paper address how impact energy influences the densification and mechanical properties of powder metallurgical (P/M) preforms during a P/F process by combining finite element simulations and experiments. The simulated results coincide well with the experimental results. Results reveal that impact energy strongly influences the P/M preform densification by controlling their stress states and strain rate. The densification continuously proceeds throughout the P/F processing by the three steps of micro-pore compression, segmentation, and closure, while the densification uniformity gradually deteriorates in the earlier free upsetting step and then significantly improves in the later closed compressing step. The increased impact energy within the range below 56.3J/cm3induces a higher strain rate, and thus facilitates the P/M preform densification notably. Inversely, the excessive impact energy not only has less influence on the densification but also creates exceptionally high forging pressure. The notably increased density improves the mechanical properties of the P/F forgings significantly; meanwhile, the concomitant work hardening changes their tensile fracture modes and slows down their ductility rising. In this study, the P/F Fe–C–Cu forgings prepared at the optimized impact energy of 56.3J/cm3have a high and uniform density and good mechanical properties. This study can provide theoretical guidance for the rational process design of powder forging.
机译：精确的冲击能量控制对于粉末锻造（P / F）技术的成功非常重要。本文通过组合有限元模拟和实验，影响能量在P / F过程中对粉末冶金（P / M）预成型坯的致密化和力学性能的解决方法。模拟结果与实验结果相一致。结果表明，冲击能量通过控制其应力状态和应变速率强烈影响P / M预制件致密化。通过微孔压缩，分割和闭合的三个步骤，致密化在整个P / F处理过程中不断进行，而致密化均匀性在早期的自由镦锻步骤中逐渐劣化，然后在后面的闭合压缩步骤中显着改善。增加的冲击能量在低于56.3J / cm 3的范围内，应变率较高，因此促进了P / M预制件致密化。相反，过度的影响能量不仅对致密化的影响较小，而且产生了极高的锻造压力。显着增加的密度显着提高了P / F锻件的机械性能;同时，伴随的工作硬化改变了它们的拉伸骨折模式，减慢了延展性上升。在该研究中，在优化的冲击能量为56.3J / cm 3的优化冲击能量下制备的P / F Fe-C-Cu锻件高均匀的密度和良好的机械性能。本研究可以为粉末锻造的合理过程设计提供理论指导。

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