摘要
在等离子弧堆焊铁基复合耐磨合金过程中引入外加纵向直流磁场,在堆焊层中合成陶瓷硬质相,研究磁场电流大小对母材的稀释作用的影响。利用光学显微镜、扫描电镜、能谱分析仪、显微硬度计等试验设备进行检测分析。结果表明,外加磁场可以增加母材与堆焊层之间的过渡层的厚度,提高堆焊层与母材的结合强度,从而提高了材料的整体耐磨性能;随着磁场电流的增加,母材的稀释作用增强,磁场电流为4A时,过渡层的厚度适中,保证了堆焊层与母材的结合强度的同时没有影响堆焊层中硬质相的形成;磁场电流5A以上时,由于强烈的电磁搅拌作用,母材对堆焊合金的稀释作用过大,阻碍了堆焊层中陶瓷硬质相的形成,不利于提高耐磨性。
Longitudinal DC magnetic field was introduced in the process of welding iron based wear-resistant alloy by plasma arc. The ceramic hard phase was in-situ synthesized in the surfacing layer.The dilution of the base material to the surfacing layer was researched. Optical Microscope （OM）, Scanning Electron Microscope （SEM）, Spectrum analyzer（EDS） were used to test the microstructure of the surfacing layer. The results show that the thickness of the transition layer between the surfacing layer and base metal increases when the longitudinal DC magnetic field is introduced. The bonding strength between the surfacing layer and base metal is improved, and the wear resistance of the surfacing layer is improved. The dilution of the base metal to the surfacing layer increases when the magnetic field current is bigger. The thickness of the transition layer is moderate when the magnetic field current is 4A. The bonding strength between the surfacing layer and the base metal is ensured, at the same time ,the formation of ceramic hard phase is not affected. The dilution of the base material is larger when the magnetic field current exceeds 5A because the electromagnetic stirring is too strong. The formation of the hard phase is blocked, and the wear resistance of surfacing layer is not conductive to be improved.
出处
《热加工工艺》
CSCD
北大核心
2012年第13期175-177,共3页
Hot Working Technology
关键词
稀释率
陶瓷硬质相
结合强度
堆焊层
纵向直流磁场
dilution
ceramic hard phase
bonding strength
surfacing layer
longitudinal DC magnetic field
