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摘要：
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为了制备符合锻模使用性能要求的模膛表面强化层,进行了在指定的W6Mo5Cr4V2基体上激光熔覆金属陶瓷Ni60/Ni-Cr-Cr3C2的试验研究。主要研究熔覆材料的成分构成,熔覆时的激光参数及所制备的熔覆层的物相、组织形貌及显微硬度分布。试验结果说明,采用50%∶50%的Ni60粉和Ni-Cr-Cr3C2粉做覆层材料,采用激光功率1.7 kW,扫描速度4 mm.s-1,光斑直径为3 mm,预涂厚度为0.6 mm的激光熔覆工艺,可以得到组织细化硬度较高的激光覆层。说明激光熔覆金属陶瓷是制备热锻模膛表面强化层的一种有前途的方法。
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For preparing the molding chamber surface strengthening coating in accordance with the properties of forging die,the cladding of Ni60/Ni-Cr-Cr3C2 on the surface of W6Mo5Cr4V2 steel was studied,mainly including the component composing of the powder,various laser process parameters and the phase composition of clad layers,microstrueture and the distribution of micro-rigidity.The results show that using 50%∶50% Ni60/Ni-CrCr3C2 as cladding material,the laser power P=1.7 kW,scanning velocity V=4 mm·s-1,spot diameter D=3 mm,cladding thickness T=0.6 mm as the laser cladding process,the laser coating with fining microstructure and higher micro hardness can be obtained.The experience shows that laser cladding cermet is one of prospect methods for preparing molding chamber surface strengthening coating.
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基金项目：
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国家自然科学基金资助项目(50675165)
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作者简介：
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参考文献：
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[1]林文松.功能梯度材料涂层制备技术的研究进展[J].表面技术,2004,33(4):7-9.
[2]Zhang D W,Tian L,Lei T C.Laser cladding of Ni-Cr3C2(Ni+Cr)composite coating[J].Surf.Coat.Technol.,1998,110:81-85.
[3]Abbas G,West D R F.Laser surface cladding of satelliteand Stellite-SiC composited deposite for enhanced hardnessandwear[J].Wear,1991,143:353-363.
[4]段慧玲,高俊峰,张书勤.Cr3C2对激光熔覆Ni合金层组织和性能的影响[J].石油机械,1999,27(5):46-48.
[5]石德珂.材料科学基础[M].北京:机械工业出版社,1999.
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