Investigation of Decarburization Behaviour during the Sintering of Metal Injection Moulded 420 Stainless Steel
Investigation of Decarburization Behaviour during the Sintering of Metal Injection Moulded 420 Stainless Steel
复制标题
金属注射成型 420 不锈钢烧结过程中脱碳行为的研究
DOI：
10.3390/met10020211
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发表时间：
2020-02-01
期刊：
影响因子：
2.9
通讯作者：
An, Chuanfeng
中科院分区：
文献类型：
--
作者：
Lou, Jia;Liu, Muyao;An, Chuanfeng
研究了金属注射成形420不锈钢烧结过程中的脱碳行为。特别关注的是在不同温度下烧结的零件的脱碳机制和碳分布。结果表明，碳含量的损失主要是通过粉末颗粒表面氧化物的还原或与大气反应而发生的。根据致密化程度，烧结脱碳分为两个阶段。在1200 °C以下，在粉末颗粒表面发生脱碳。表面氧化物与无定形碳或残余有机物反应以形成金属表面。此时，烧结体的碳含量分布类似于脱粘态样品的碳含量分布。表面氧化物的还原促进烧结。在1200 °C时，致密化速度在样品的中心区域较高，在那里相互连通的孔隙关闭，并发生脱碳的第二阶段。在1200 °C以上的温度下，内层的碳原子必须迁移到表面与大气反应。脱碳速度降低，烧结态零件的碳含量分布与致密脱碳件的碳含量分布相似。
The decarburization behaviour during the sintering of metal-injection-moulded 420 stainless steel was investigated. Particular attention has been paid to the decarburization mechanisms and carbon distribution of parts sintered at different temperatures. The results indicate that the loss of carbon content occurs mainly through the reduction of surface oxides of powder particles or reaction with the atmosphere. Depending on the densification level, the sintering decarburization is separated into two stages. Below 1200 °C, decarburization occurs at the powder particle surface. The surface oxides react with the amorphous carbon or residual organics to pose the metal surface. At this time, the carbon content distribution of the sintered body is similar to that of the as-debound sample. The reduction of surface oxides promotes sintering. At 1200 °C, the densification speed is higher in the centre region of the sample, where the interconnected pores close and the second stage of decarburization takes place. At temperatures above 1200 °C, carbon atoms in the inner layers must migrate to the surface to react with the atmosphere. The decarburization speed is reduced and the carbon content distribution of the as-sintered part is similar to that of the dense decarburized part.