Study on Microstructure and Properties of TiC/Cobalt Base Superalloy by Laser Cladding on 32Cr3Mo1V Surface
In view of the failure of the surface of aluminothermic roll sleeve due to high temperature friction and wear,the high temperature wear-resistant cladding coatings of Co-08 with different mass fraction(0%,5%,10%,15%)TiC were prepared on the surface of 32Cr3Mo1V by coaxial powder feeding laser cladding.The microstructure,phase composition and micro zone composition of the cladding layer were analyzed,and the microhardness and high temperature friction and wear properties were tested.The results show that Co-08 coating is mainly composed of γ-Co and carbide intergranular,the wear forms are oxidation wear and abrasive wear.When the addition amount of TiC is 5%,the content of carbide in the intergranular structure decreases,the content of Fe element in the coating increases,the microhardness decreases,the friction coefficient increases,and the wear form changes from oxidation wear to adhesive wear and abrasive wear.When TiC content is greater than or equal to 10%,the content of intergranular carbide increases,and fine TiC particles are precipitated in the coating,which effectively improves the microhardness of the coating and significantly reduces its friction coefficient.The wear mechanism is mainly oxidation wear and slight abrasive wear.When the addition amount of TiC is 5%,the microstructure of the coating becomes coarse and the microhardness and high-temperature wear resistance decrease.With the continuous increase of TiC content,small-size TiC reinforcements are reprecipitated in the coating,and the content of intergranular carbides also increases.The microhardness a nd high temperat ure wear resistance also increase with the increase of TiC content.When TiC content is greater than or equal to 10%,TiC/Co-08 composite coating has good high temperature wear resistance.
Co based alloylaser claddingTiCmicrostructurehigh temperature friction and wear
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