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

被引：0
|
作者：
Junho Lee [1 ]
Dongju Lee [2 ]
Myung Hoon Song [3 ]
Wonhyuk Rhee [3 ]
Ho Jin Ryu [1 ,4 ]
Soon Hyung Hong [1 ]
机构：
[1] Department of Materials Science and Engineering,Korea Advanced Institute of Science and Technology
[2] Nuclear Materials Development Division,Korea Atomic Energy Research Institute
来源：
JournalofMaterialsScience&Technology | 2018年 / 34卷 / 08期
关键词：
Metal matrix composites; Sintering; Mechanical properties; Microstructures;
D O I：
暂无
中图分类号：
TB333 [金属－非金属复合材料];
学科分类号：
摘要：
Fe alloy composites reinforced with in-situ titanium carbide(Ti C) 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 of in-situ Ti C/Fe alloy composites.The microstructure showed that the in-situ synthesized Ti C particles were spherical with a size of 1–3 μm,irrespective of C/Ti ratio.The stoichiometry of in-situ Ti C 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 Ti Cxat the common sintering temperature.The in-situ Ti C/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 Ti C/Fe alloy composites can be achieved by microstructure control and stoichiometric analysis of the in-situ synthesized Ti C particles,while maintaining the ductility of the composites,compared to those of the unreinforced Fe alloy.Therefore,we anticipate that the in-situ synthesized Ti C/Fe alloy composites with enhanced mechanical properties have great potential in cutting tool,mold and roller material applications.
引用
收藏
页码：1397 / 1404
页数：8
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