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在4Cr5W2SiV模具钢表面激光熔覆不同含量Y2O3的HT-1合金粉末,利用OM、XRD、显微硬度计和磨损试验机研究了Y2O3对熔覆层组织结构和性能的影响。结果表明:当Y2O3添加量在0～3.0wt%变化时,随着Y2O3含量的增加,熔覆层组织逐渐变细,当Y2O3含量在1.0wt%时,熔覆层组织最细,然而,当Y2O3含量>1.0wt%时,熔覆层组织随着Y2O3含量的增加而变粗大;当未添加Y2O3时,熔覆层除了基体相α-Fe外,还有Fe2B、Fe3C、FeSi等相以及一定量的非晶组织,当添加Y2O3后,熔覆层中出现了少量的尖晶石类矿物质FeFe2O4。Y2O3添加量为1.0wt%时,熔覆层具有最高的硬度和耐磨性,当Y2O3含量大于1.0wt%时,熔覆层的硬度和耐磨性随着Y2O3含量的增加反而降低。
The effects of Y2O3 on the microstructure and properties of the coatings were investigated by OM, XRD, microhardness tester and wear tester on the surface of 4Cr5W2SiV laser cladded HT-1 alloy with different content of Y2O3. The results show that the microstructure of the coating becomes finer with the increase of Y2O3 content when the amount of Y2O3 is 0 ~ 3.0wt%. When the Y2O3 content is 1.0wt%, the microstructure of the coating is the smallest. However, When Y2O3 content> 1.0wt%, the microstructure of cladding layer becomes coarse with the increase of Y2O3 content. When Y2O3 is not added, besides the matrix phase α-Fe, there are Fe2B, Fe3C, FeSi phase and a certain Amount of amorphous structure, when added Y2O3, a small amount of spinel mineral FeFe2O4 appears in the cladding layer. When the content of Y2O3 is 1.0wt%, the cladding layer has the highest hardness and wear resistance. When the content of Y2O3 is more than 1.0wt%, the hardness and wear resistance of the cladding layer decrease with the increase of Y2O3 content.