Microstructure and mechanical properties of powder-injection-molded products of Cu-based amorphous powders and Fe-based metamorphic powders
Microstructure and mechanical properties of powder-injection-molded products of Cu-based amorphous powders and Fe-based metamorphic powders
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DOI：
10.1016/j.msea.2007.05.014
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发表时间：
2008-03
期刊：
影响因子：
6.4
通讯作者：
C. K. Kim;Chang-Young Son;D. J. Ha;T. Yoon;Sunghak Lee;N. Kim
中科院分区：
文献类型：
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作者：
C. K. Kim;Chang-Young Son;D. J. Ha;T. Yoon;Sunghak Lee;N. Kim
采用粉末注射成形技术对铜基非晶合金粉末和铁基变质合金粉末进行了注射成形，分析了粉末注射成形制品的显微组织、硬度和耐磨性，并与传统的注射成形不锈钢制品进行了比较。注射成型铜基非晶粉末即使在略低于熔化温度的温度下也很难烧结，因为大部分非晶相被晶相取代。将铁基变质粉末注射成型，然后在1200℃下烧结，得到了完全致密、几乎没有气孔的制品。它们含有34vol.%的(Cr，Fe)2B硼化物弥散在奥氏体基中，没有非晶相。由于这些(Cr，Fe)2B硼化物具有很高的硬度和热稳定性，铁基变质粉末粉末注射成形制品的硬度、高温硬度和耐磨性是常规粉末注射成形不锈钢制品的两倍。这种性能的改善表明，铁基变质粉末的粉末注射成形产品在需要优异机械性能的结构和部件上具有新的适用性。
In the present study, a powder-injection molding (PIM) process was applied to Cu-based amorphous alloy powders and Fe-based metamorphic alloy powders, and microstructure, hardness, and wear resistance of the PIM products were analyzed and compared with those of conventional PIM stainless steel products. Injection-molded Cu-based amorphous powders were hardly sintered even at temperatures just below the melting temperature as most of amorphous phases were replaced by crystalline phases. When Fe-based metamorphic powders were injection-molded and then sintered at 1200°C, completely densified products with almost no pores were obtained. They contained 34vol.% of (Cr,Fe)2B borides dispersed in the austenitic matrix without amorphous phases. Since these (Cr,Fe)2B borides were very hard and thermally stable, hardness, high-temperature hardness, and wear resistance of the PIM products of Fe-based metamorphic powders were twice as high as those of conventional PIM stainless steel products. Such property improvement suggested new applicability of the PIM products of Fe-based metamorphic powders to structures and parts requiring excellent mechanical properties.