CAJ | 학술논문

利用高速火焰喷涂在45钢表面制备了Ni60AA和DZ-WC-12Co硬质合金层,再采用5 kW连续CO2激光器进行激光熔凝。通过GX51金相显微镜观察显微组织,HXS-1000TAY维氏硬度计测量硬度分布,MM-W1B立式万能磨损试验机进行磨损试验。结果表明,激光熔凝显著地消除了硬质合金层中未熔硬质合金颗粒、孔洞及裂纹等缺陷,组织更加细小、均匀；激光熔凝后,硬质合金层的硬度提高,平均显微硬度高达647 HV0.3。在试验条件下,激光熔凝后的硬质合金层的摩擦因数从原来的0.1373降至0.0948,激光熔凝可明显改善涂层的耐磨性能。
이용고속화염분도재45강표면제비료Ni60AA화DZ-WC-12Co경질합금층,재채용5 kW련속CO2격광기진행격광용응。통과GX51금상현미경관찰현미조직,HXS-1000TAY유씨경도계측량경도분포,MM-W1B입식만능마손시험궤진행마손시험。결과표명,격광용응현저지소제료경질합금층중미용경질합금과립、공동급렬문등결함,조직경가세소、균균；격광용응후,경질합금층적경도제고,평균현미경도고체647 HV0.3。재시험조건하,격광용응후적경질합금층적마찰인수종원래적0.1373강지0.0948,격광용응가명현개선도층적내마성능。
Ni60AA and DZ-WC-12Co cemented carbide coatings were prepared on 45 steel by high velocity flame spraying, then laser melted by 5 kW continuous wave CO2 laser. The microstructure was observed by Olympus GX51 microscope, the micro-hardness distribution was tested by HXY-1000TAY Vickers hardness tester and the wear test was carried out by MM-W1B vertical universal wear testing machine. The results show that laser melting can significantly eliminate the unmelted carbide particles, holes and cracks in coatings,and the microstructure is fine and uniform. After laser melting, the average micro-hardness of the carbide coatings is up to 647 HV0. 3. Under the experimental conditions, the friction coefficient of the coating after laser melting decreases from 0. 1373 to 0. 0948. The wear resistance of cemented carbide coatings can be significantly improved after laser melting.