摘要
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。
HT-1 alloying powder with different Y2O3 contents was clad on 4CrSW2SiV mould steel by laser. The effects of Y2O3 on microstrueture and properties of the coating were investigated with OM, XRD, hardometer and wear testing machine. The results show that the content of Y2O3 varies from 0wt% to 3.0wt%, as the content of Y2O3 increases, the grain size in coating gradually becomes finer. When the content of Y2O3 is up to 1.0wt% ,the finest grain is obtained. However, when the content of Y2 O3 exceeds 1.0wt% , the grain in coating is coarser with increase of Y2O3. Without Y2O3 in coating, there are some phases such as Fe2 B, Fe3 C, FeSi and an amount of amorphous besides the main phase a-Fe in coating. When addition of Y2O3 into coating, a new kind of phase FeFe2O4 appears in coating. When the content of Y2O3 is 1.0wt% , the highest hardness and wear resistance are obtained, when the content of Y2O3 exceeds 1.0wt%, the hardness and wear resistance of the coating adversely decrease with increase of Y2O3
出处
《金属热处理》
CAS
CSCD
北大核心
2009年第8期62-65,共4页
Heat Treatment of Metals
基金
科技部科技型中小企业创新基金(国科发计字[2007]335号)
贵州省科技型中小企业创新基金(黔科计字[2006]5027号)
贵州大学大学生SRT项目贵大SRT字(2007)192号
