In-situ synthesis of TiC/Fe alloy composites with high strength and hardness by reactive sintering  

作　　者：Junho Lee Dongju Lee Myung Hoon Song Wonhyuk Rhee Ho Jin Ryu Soon Hyung Hong 

机构地区：[1]Department of Materials Science and Engineering,Korea Advanced Institute of Science and Technology,291 Daehak-ro,Yuseong-gu,Daejeon,305-701,Republic of Korea [2]Department of Nuclear and Quantum Engineering,Korea Advanced Institute of Science and Technology,291 Daehak-ro,Yuseong-gu,Daejeon,305-701,Republic of Korea [3]Nuclear Materials Development Division,Korea Atomic Energy Research Institute,111 Daedeok-daero 989 Beon-gil,Yuseong-gu,Daejeon,305-353,Republic of Korea [4]Daewha Alloytech Corporation,17-60,Sanupdanji-gil,Myeoncheon-myeon,Dangjin-si,Chungcheongnam-do,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2018年第8期1397-1404,共8页材料科学技术（英文版）

基　　金：supported by the Ministry of Trade,Industry&Energy(MOTIE,Korea)under Industrial Technology Innovation Program.No.10046591,‘Development of TiC reinforced metal matrix composite fabricated by in-situ liquid forming for tool steel’

摘　　要：Fe alloy composites reinforced with in-situ titanium carbide （TIC） particles were fabricated by reactive sintering using different reactant C/Ti ratios of 0.8, 0.9, 1 and 1.1 to investigate the microstructure and mechanical properties ofin-situ TiC/Fe alloy composites. The microstructure showed that the in-situ syn- thesized TiC particles were spherical with a size of 1-3 }~m, irrespective of C/Ti ratio. The stoichiometry of in-situ TiC increased from 0.85 to 0.88 with increasing C/Ti ratio from 0.8 to 0.9, but remained almost unchanged for C/Ti ratios between 0.9 and 1.1 due to the same driving force for carbon diffusion in TiCx at the common sintering temperature. The in-situ TiC/Fe alloy composite with C[Ti ~ 0.9 showed improved mechanical properties compared with other C/Ti ratios because the presence of excess carbon （C/Ti = 1 and 1.1） resulted in unreacted carbon within the Fe alloy matrix, while insufficient carbon （C/Ti = 0.8） caused the depletion of carbon from the Fe alloy matrix, leading to a significant decrease in hardness. This study presents that the maximized hardness and superior strength of in-situ TiC/Fe alloy composites can be achieved by microstructure control and stoichiometric analysis of the in-situ synthesized TiC par- ticles, while maintaining the ductility of the composites, compared to those of the unreinforced Fe alloy. Therefore, we anticipate that the in-situ synthesized TiC/Fe alloy composites with enhanced mechanical properties have great potential in cutting tool, mold and roller material applications.Fe alloy composites reinforced with in-situ titanium carbide （TIC） particles were fabricated by reactive sintering using different reactant C/Ti ratios of 0.8, 0.9, 1 and 1.1 to investigate the microstructure and mechanical properties ofin-situ TiC/Fe alloy composites. The microstructure showed that the in-situ syn- thesized TiC particles were spherical with a size of 1-3 }~m, irrespective of C/Ti ratio. The stoichiometry of in-situ TiC increased from 0.85 to 0.88 with increasing C/Ti ratio from 0.8 to 0.9, but remained almost unchanged for C/Ti ratios between 0.9 and 1.1 due to the same driving force for carbon diffusion in TiCx at the common sintering temperature. The in-situ TiC/Fe alloy composite with C[Ti ~ 0.9 showed improved mechanical properties compared with other C/Ti ratios because the presence of excess carbon （C/Ti = 1 and 1.1） resulted in unreacted carbon within the Fe alloy matrix, while insufficient carbon （C/Ti = 0.8） caused the depletion of carbon from the Fe alloy matrix, leading to a significant decrease in hardness. This study presents that the maximized hardness and superior strength of in-situ TiC/Fe alloy composites can be achieved by microstructure control and stoichiometric analysis of the in-situ synthesized TiC par- ticles, while maintaining the ductility of the composites, compared to those of the unreinforced Fe alloy. Therefore, we anticipate that the in-situ synthesized TiC/Fe alloy composites with enhanced mechanical properties have great potential in cutting tool, mold and roller material applications.

关 键 词：Metal matrix composites SINTERING Mechanical properties MICROSTRUCTURES 

分 类 号：Q1[生物学—普通生物学]