含钛铁基耐磨复合材料的研制

为了研制一种铁基耐磨复合材料,采用等离子熔覆技术,通过调节铬含量制备多组Fe-Cr-Ti-C合金系统.借助SEM和XRD等分析手段对熔覆层组织和碳化物形貌进行分析.结果表明,熔覆层中随着铬含量的提高,基体组织由A+F向F及M转变;碳化物M7C3及TiC等硬质相的数量逐渐增多.此外研究了铬含量对熔覆层耐磨粒磨损性能的影响规律,熔覆层的耐磨性随着铬含量的增加而提高,当铬含量达到20.1%时,大量高硬度六边形M7C3复合物结合一定量的呈开花状、球状或团聚状TiC颗粒均匀弥散分布在具有较高强韧性的板条马氏体基体中,使得熔覆层具有最佳的耐磨性.

Investigation on wear resistance of Fe-based composite material containing titanium

A series of Fe-Cr-Ti-C hardfacing alloys with different Cr contents were prepared by PTA in order to develop a Fe-based wear resistant composite material.The microstructure and carbides morphology were investigated by means of scanning electron microscopy(SEM) and X-ray diffraction(XRD).The results show that the matrix transforms from austenite and ferrite to ferrite and martensite,the volume fraction of M7C3 and TiC increase with the Cr content being increased.In addition,the effects of Cr content on wear resistance were studied.The wear resistance of cladding layer increases with increase of Cr content.When Cr content is 20.1%,the microstructure characteristic with a high volume fraction of hexagonal M7C3 complex carbides and a small amount globular,exploded and agglomerated TiC particles are distributed in the lath martensite matrix with higher strength and toughness,which suggests that the cladding layer has a excellent wear resistance.