A study on carbon concentration distribution and microstructure of P/M materials prepared by carbusintering

作者：Dong Xianfeng; Hu Jiandong; Wang Hongying; Liu Shuangyu; Guo Zuoxing^*

来源：Journal of Materials Processing Technology, 2009, 209(8): 3776-3782.

DOI：10.1016/j.jmatprotec.2008.08.031

• Powder metallurgy (P/M)
• Carbusintering
• Diffusion coefficient
• Microstructure
• Wear

Carbusintering (CBS) process was used to produce powder metallurgy (P/M) parts (Fe-2Ni-1.5Cu-xC). Influence of sintering parameters such as temperature on diffusion coefficient of carbon was investigated. The specimen with the porosity of 6-13% got the carbon content of the surface ranged from 1.23 to 1.32 wt.%. After heat treatment, the hardness and impact energy were enhanced to 48HRC (484HV) and 13J, respectively. The change in carbon concentration along the case depth was determined quantitatively by means of chemical analysis. The carbon concentration profile was satisfactorily modeled by classical solution derived from Fick's second law. An undesired acicular structure was observed in the specimen with low green compact density due to the high carbon content. CBS process can provide outstanding performance in surface hardening of P/M materials. The use of CBS process was able to make process simple by taking sintering and carburizing as one step. The higher carbon content of the surface in P/M parts can be easily achieved compared to conventional carburizing.

• 出版日期2009-4-21
• 单位吉林大学