表面技术
錶麵技術
표면기술
Surface Technology
2015年
11期
66-70
,共5页
激光熔覆%自熔性镍基碳化钨%工艺参数%宏观表面%表面硬度%金相组织%显微硬度
激光鎔覆%自鎔性鎳基碳化鎢%工藝參數%宏觀錶麵%錶麵硬度%金相組織%顯微硬度
격광용복%자용성얼기탄화오%공예삼수%굉관표면%표면경도%금상조직%현미경도
laser cladding%self-fluxing nickel based WC%process parameters%macroscopic surface%surface hardness%micro-structure%microhardness
目的 提高45 #钢的表面性能. 方法 利用IPG光纤激光加工系统,采用不同的工艺参数在45 #钢表面激光熔覆自熔性镍基碳化钨粉末,对熔覆层的宏观表面(平整度、表面硬度、裂纹情况)及金相组织、显微硬度分布进行对比分析. 结果 在激光功率为1200 W、扫描速度为2 mm/s、送粉电压为7 V时,获得的熔覆层宏观表面相对平整光滑,平均洛氏硬度约是基体的2. 5倍. 由微观组织分析得知,熔覆层及界面处无裂纹、气孔等缺陷,熔覆层中上部组织晶粒细小,沿熔覆层与基体交界处向外,晶粒呈现柱状晶及等轴晶,组织性能良好,基体与熔覆层间冶金结合比较牢固. 熔覆层显微硬度分布比较均匀,并且与基体相比提高了约1. 5倍. 结论 45#钢表面机械性能得到提升,在其表面激光熔覆自熔性镍基碳化钨粉末具有可行性和研究价值.
目的 提高45 #鋼的錶麵性能. 方法 利用IPG光纖激光加工繫統,採用不同的工藝參數在45 #鋼錶麵激光鎔覆自鎔性鎳基碳化鎢粉末,對鎔覆層的宏觀錶麵(平整度、錶麵硬度、裂紋情況)及金相組織、顯微硬度分佈進行對比分析. 結果 在激光功率為1200 W、掃描速度為2 mm/s、送粉電壓為7 V時,穫得的鎔覆層宏觀錶麵相對平整光滑,平均洛氏硬度約是基體的2. 5倍. 由微觀組織分析得知,鎔覆層及界麵處無裂紋、氣孔等缺陷,鎔覆層中上部組織晶粒細小,沿鎔覆層與基體交界處嚮外,晶粒呈現柱狀晶及等軸晶,組織性能良好,基體與鎔覆層間冶金結閤比較牢固. 鎔覆層顯微硬度分佈比較均勻,併且與基體相比提高瞭約1. 5倍. 結論 45#鋼錶麵機械性能得到提升,在其錶麵激光鎔覆自鎔性鎳基碳化鎢粉末具有可行性和研究價值.
목적 제고45 #강적표면성능. 방법 이용IPG광섬격광가공계통,채용불동적공예삼수재45 #강표면격광용복자용성얼기탄화오분말,대용복층적굉관표면(평정도、표면경도、렬문정황)급금상조직、현미경도분포진행대비분석. 결과 재격광공솔위1200 W、소묘속도위2 mm/s、송분전압위7 V시,획득적용복층굉관표면상대평정광활,평균락씨경도약시기체적2. 5배. 유미관조직분석득지,용복층급계면처무렬문、기공등결함,용복층중상부조직정립세소,연용복층여기체교계처향외,정립정현주상정급등축정,조직성능량호,기체여용복층간야금결합비교뢰고. 용복층현미경도분포비교균균,병차여기체상비제고료약1. 5배. 결론 45#강표면궤계성능득도제승,재기표면격광용복자용성얼기탄화오분말구유가행성화연구개치.
Objective To improve the surface properties of 45# steel. Methods Using IPG fiber laser YLR-3000 Laser Proces-sing System, laser cladding of self-fluxing Ni-based WC Powders was conducted on the surface of 45# steel using different process parameters. Comparative analysis was conducted on the macroscopic surface ( Flatness, surface hardness, cracks) , metallurgical structure and distribution of microhardness of the cladding layer. Results When the laser power was 1200 W, scanning speed was 2 mm/s, and powder feeding voltage was 7 V, the cladding layer had relatively smooth macro surface, and the average Rockwell hardness of the cladding layer was about 2. 5 times that of the matrix. The microstructure analysis showed that there were no defects such as cracks and holes in the cladding layer and the interface, the middle and upper part of the cladding layer had fine grains, the grains were dendritic and equiaxed along the interface of the cladding layer and the substrate, the structural performance was good, and the metallurgical bonding between the cladding layer and the substrate was relatively strong. The microhardness distribu- tion of the cladding layer was relatively even, and increased by about 1. 5 times as compared to the substrate. Conclusion The me-chanical properties of 45# steel surface were improved. Laser cladding of self-fluxing nickel-based tungsten carbide powder on its surface has therefore feasibility and research value.
