摘要
CO_2激光器熔覆质量分数1%纳米CeO_2和20%WC添加的镍基合金涂层的磨损、显微组织与1%纳米CeO_2添加镍基合金涂层进行对比。上述2种涂层均熔覆在基体30CrMnSiNi2A上并呈优良冶金结合。超细碳化物WC对WC-CeO_2/Ni涂层的显微组织影响由X射线衍射(XRD),扫描电镜(SEM)连同能谱(EDS),电子探针(EPMA)进行分析。添加WC后M_(23)C_6增多,而M_7C_3减少。通过维氏硬度计和磨损测试系统对有WC添加和未添加CeO_2镍基合金涂层进行综合机械性能比。得出WC-CeO_2/Ni涂层明显优于CeO_2/Ni涂层。极少数热裂纹出现于WC-CeO_2/Ni涂层,萌生并扩展于熔池凝固过程中,对此做了SEM和EDS分析。裂纹机理可归因为铁稀释和WC添加导致的涂层与基体30CrMnSiNi2A间线膨胀系数间差异。
The wear behavior and microstructure of CO2 laser cladded Ni-based alloy coatings with 1 wt% nano-CeO2 and 20 wt% WC addition （CeO2/Ni） was compared with Ni-based coatings with 1 wt% nano-CeO2 addition （WC-CeO2/Ni）. Both coatings were cladded on 30CrMnSiNi2A steel with good metallurgical bounding to substrate. The influence of ultra-fine carbide WC on the microstructure of WC-CeOjNi alloy composite coatings were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） coupled with energy dispersive spectroscopy （EDS） and electron probe micro analysis （EPMA）. WC addition increased M23C6 content, but decreased the M7C3. The comparison of comprehensive mechanical properties between coatings with and without fine WC particles was conducted on Vickers hardness and wear-resistance test system. Results indicate that the performance of WC-CeO2/Ni is better than that of CeOffNi metal matrix composition （MMC）. Few hot cracks appeared in Ni-based WC-CeO2 MMC production, which were investigated by SEM and EDS. The crack mechanism can be claimed as Fe dilution and coefficient of thermal expansion for WC-CeO2/Ni MMC differed from that of base material 30CrMnSiNi2A steel.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第1期20-25,共6页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51075328,51675424)
Fundamental Research Funds for the Central Universities(3102015BJ(II)MYZ28)
