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首页> 外文会议>Powder metallurgy world congress amp; exhibition >Oxide Transformation During Sintering Of Prealloyed Water Atomized Steel Powder
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Oxide Transformation During Sintering Of Prealloyed Water Atomized Steel Powder

机译：预合金水雾化钢粉烧结过程中的氧化物转变

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Some amount of oxides are already present on the initial powder surface and its interior, however further oxide products formation and their transformation during sintering remains unclear. The present study deals with the modelling of oxides transformation in dependence on sintering atmosphere composition, its purity and temperature profile utilizing variety of chemical and thermodynamic softwares based on experimental results from interrupted sintering trials. As the base material prealloyed with chromium water atomized steel powder was used. The type, morphology and composition of oxide products on the fracture surface were studied by means of HR SEM combined with EDX analysis. Results indicate that oxide transformation processes occur in accordance with the thermodynamic stability of oxides, presented on the initial powder surface, in the line Fe_2O_3→FeO→Fe_2MnO_4→Cr_2FeO_4→Cr_2O_3→MnCr_2O_4→MnO. Amount and composition of surface products are strongly determined not only by conditions during dwelling at sintering temperature but also by processes during preceding heating stage.
机译：最初的粉末表面及其内部已经存在一定数量的氧化物，但是尚不清楚在烧结过程中是否会进一步形成氧化物产物及其转化。本研究基于不连续烧结试验的实验结果，利用各种化学和热力学软件，对依赖于烧结气氛成分，其纯度和温度分布的氧化物转化进行建模。作为与铬水预合金化的基材，使用雾化的钢粉。通过HR SEM结合EDX分析研究了断裂表面氧化物产物的类型，形态和组成。结果表明，根据初始粉末表面上呈现的氧化物的热力学稳定性，在Fe_2O_3→FeO→Fe_2MnO_4→Cr_2FeO_4→Cr_2O_3→MnCr_2O_4→MnO线中发生了氧化物转变过程。表面产物的量和组成不仅取决于烧结温度下的停留条件，还取决于先前加热阶段的工艺。

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