Research on In- situ Synthesis of （V,Nb） C Reinforced Iron Matrix Composite and Its Microstructure
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摘要: 采用粉末冶金的方法原位合成一种(V,Nb)C增强铁基复合材料,其烧结密度在1 360℃达到7.07 g/cm3。使用X射线衍射(XRD),扫描电镜(SEM)对微观组织进行分析,结果表明:NbC在高温析出过程中吸附在VC颗粒表面,逐渐向内渗透,形成(V,Nb)C固溶体,能够抑制硬质相颗粒的长大。Nb/V摩尔比为0.4时,Nb能有效地抑制合金元素在碳化物中的固溶,使得V、Mo、Cr元素大量进入奥氏体中,从而在随炉冷却的条件下得到贝氏体加残余奥氏体的基体组织。
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关键词:
- (V,Nb)C增强铁基复合材料 /
- 粉末冶金 /
- 原位合成 /
- 微观组织
Abstract: In-situ synthesized（V,Nb）C reinforced iron matrix composites with sintering density of 7.07 g·cm-3 at 1 360 ℃were prepared by powder metallurgy process.The microstructure of the composites were investigated by X-ray diffraction（XRD）and scanning electron microscope（SEM）respectively.The results show that NbC absorbs on the surface of VC particles during high temperature precipitation process and then（V,Nb） C solid solution that could inhibit the growth of hard-phase particles is formed by inward penetration of NbC.When the molar ratio of Nb/V was 0.4,Nb could effectively inhibit solid solution of alloy elements in carbides,bringing a large number of V,Mo and Cr into austenite,and thus the iron matrix comprising of bainite and residual austenite was obtained with furnace cooling. -
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