烧结气氛对粉末冶金铁基高碳材料组织的影响  

Effect of sintering atmosphere on the microstructure of high carbon iron based powder metallurgy materials

作　　者：吴龙 邓恩龙 崔永涛 李俊 叶子君 WU Long;DENG Enlong;CUI Yongtao;LI Jun;YE Zijun(Porite Yangzhou Technology&Industry Co.,Ltd.,Yangzhou 225002,China)

机构地区：[1]扬州保来得科技实业有限公司,扬州225002

出　　处：《粉末冶金技术》2024年第5期497-502,共6页Powder Metallurgy Technology

摘　　要：以Fe–Cu–0.8%C合金为原料,采用粉末冶金技术压制成形,研究不同烧结气氛(丙烷裂解和分解氨)条件对烧结产品显微组织的影响。结果表明:在丙烷裂解气氛中烧结,高碳产品表面会出现脱碳现象,产品表面硬度较芯部硬度低HV0.140,可通过添加不同流量的瓦斯进行碳补偿,但因补偿不均匀性,产品局部会出现网状渗碳体,影响产品的性能;在分解氨气氛中烧结,产品表面无明显脱碳情况,通过补偿5~10 L·h^(-1)瓦斯即可获得最优的显微组织,而且试样表面与芯部的硬度基本一致。The influence of sintering atmosphere(propane cracking and ammonia decomposition)on the microstructure of the Fe–Cu–0.8%C alloy products sintered by powder metallurgy technology was studied.The results show that the decarburization are present on the surface of high-carbon products sintered in propane cracking atmosphere,and the product hardness on the surface is lower than that in the core by HV0.140.Carbon compensation can be carried out by adding gas flow,but the network cementite may appear in the part of products because of the uneven compensation,affecting the product performance.There is no obvious decarburization on the surface of the products sintered in decomposed ammonia atmosphere,the optimal microstructure can be obtained by compensating gas flow as 5~10 L·h^(−1),and the hardness on the surface and in the core of the products are basically the same.

关 键 词：铁基高碳材料 烧结气氛 脱碳 瓦斯补偿 显微组织 

分 类 号：TF124[冶金工程—粉末冶金]