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首页> 外文会议>Euro PM2008 congress amp; exhibition proceedings >Fragmentation of Gas Atomized Steel Powder during Liquid PhaseSintering with an Admixed Fe-B-C Powder
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Fragmentation of Gas Atomized Steel Powder during Liquid PhaseSintering with an Admixed Fe-B-C Powder

机译：Fe-B-C混合粉末在气相烧结过程中气雾化钢粉的破碎

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An atomized low-alloy steel powder of < 150 μm in size was mixed with a hypereutectic Fe-rnB-C powder of < 36 μm in size to give a liquid phase during sintering. However, the grainrnboundaries within the steel powder particles were decorated with carbide/boride-precipitatesrnalready in the solid state at 1100℃ before liquid phase sintering occurred at 1200℃ to givernfull density. The decorated boundaries had molten and thereby the steel powder particlesrnwere fragmented by a liquid C,B-rich phase into their crystallographic grains. The results ofrnlight optical microscopy, SEM and EDX reveal that solid state diffusion of C and B is so rapid,rnthat their initially localized content is almost evenly distributed in the solid powder mix. Thusrnlocalized melting of the Fe-B-C alloy to join the steel powder is prevented. Instead generalrnmelting of a hypoeutectic mixture causes compaction during sintering, just as in a powder ofrnhypoeutectic white cast iron.
机译：将尺寸小于150μm的雾化低合金钢粉末与尺寸小于36μm的过共晶Fe-rnB-C粉末混合，以在烧结过程中形成液相。然而，在1200℃下进行液相烧结以达到全密度之前，已在1100℃下以固态碳化物/硼化物-沉淀物装饰了钢粉颗粒内的晶界。装饰的边界熔化了，因此钢粉颗粒被富含C，B的液相破碎成它们的结晶晶粒。光学显微镜，SEM和EDX的结果表明，C和B的固态扩散非常快，以至于它们的初始局部含量几乎均匀地分布在固体粉末混合物中。从而防止了Fe-B-C合金的局部熔化以结合钢粉。相反，亚共晶混合物的一般熔化会导致烧结过程中的压实，就像亚共晶白色铸铁的粉末一样。

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