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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 >Influence of Carbon Activity and Oxygen Potential of Sintering Atmospheres on the Microstructural Characteristics of Low Alloy P/M Steels
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Influence of Carbon Activity and Oxygen Potential of Sintering Atmospheres on the Microstructural Characteristics of Low Alloy P/M Steels

机译：烧结气氛中碳活性和氧势对低合金P / M钢组织性能的影响

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摘要

The influence of the characteristics of a sintering atmosphere based on H_2/N_2 gas mixtures, on the sinterability and the resulting mechanical properties of P/M steels containing high oxygen affinity elements, like Cr and Mn, has been studied at 1100 and 1240℃. Special attention has been paid, to the control and evolution of critical parameters like oxygen partial pressure and carbon activity, and to their sensitivity in relation to the chemical composition of the initial atmosphere and the sintering temperature. Theoretical thermodynamic calculations referred to the interaction between the atmosphere and the powder compacts based on equilibrium conditions have been considered for various H_2/N_2 ratios, dew points and small amounts of methane additions. Predictions from these calculations were compared to experimentally obtained results. Microstructural observations from the surface to the core of the specimens and tensile properties according to MPIF standards were carried out. Cr and Mn containing alloyed steels, with 0 and 0.4 wt% C were sintered in selected atmospheres. The carburisation-decarburisation phenomena and the role of carbon during oxide reduction are discussed. The alternative use of a typical endothermic atmosphere was evaluated.
机译：在1100和1240℃下研究了基于H_2 / N_2气体混合物的烧结气氛的特性对含Cr和Mn等高氧亲和力元素的P / M钢的烧结性和所得力学性能的影响。对于关键参数（如氧分压和碳活度）的控制和演变及其相对于初始气氛的化学成分和烧结温度的敏感性，已经给予了特别关注。对于各种H_2 / N_2比，露点和少量甲烷添加，已经考虑了基于平衡条件的涉及大气和粉末压块之间相互作用的理论热力学计算。将这些计算的预测结果与实验获得的结果进行比较。根据MPIF标准，从样品的表面到核心进行了显微组织观察，并观察了拉伸性能。在选定的气氛中烧结含Cr和Mn的合金钢，其中C含量为0和0.4 wt％。讨论了渗碳-脱碳现象以及碳在氧化物还原过程中的作用。评估了典型吸热气氛的替代用途。

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