CAJ | 학술논문

研究了在45#钢基体表面激光熔覆Al65Cu20Cr15准晶态合金过程中,工艺参数激光功率(P)和扫描速度(v)对激光熔覆涂层相结构的影响.结果表明,激光功率和扫描速度的变化使基体材料对熔覆涂层的稀释率发生改变.随着激光熔覆稀释率的增加,熔覆层的相结构依次为A+I,I+β,β,β+d,d+Fe.激光熔覆涂层相结构的差异使涂层具有不同的显微硬度.参数δ(P/v)决定激光熔覆过程的稀释度,从而直接影响激光熔覆准晶涂层的相结构.涂层的表面显微硬度也因涂层相结构的不同而有所差异.
연구료재45#강기체표면격광용복Al65Cu20Cr15준정태합금과정중,공예삼수격광공솔(P)화소묘속도(v)대격광용복도층상결구적영향.결과표명,격광공솔화소묘속도적변화사기체재료대용복도층적희석솔발생개변.수착격광용복희석솔적증가,용복층적상결구의차위A+I,I+β,β,β+d,d+Fe.격광용복도층상결구적차이사도층구유불동적현미경도.삼수δ(P/v)결정격광용복과정적희석도,종이직접영향격광용복준정도층적상결구.도층적표면현미경도야인도층상결구적불동이유소차이.
The phase selection in Al65Cu20Cr15 quasicrystalline coating produced by laser cladding was studied as a function of the laser power and scanning speed. A parameter δ, defined as the ratio of the laser power, P, to the scanning speed, v, has been used to understand the effect of the laser parameters on the phase selection of layer claddings. Experimental results indicated that the icosahedral (i) phase could be formed for low value of δ, and that especially the volume fraction of (i) phase was essentially dependent on the scanning speed. On the contrary, high value of δ enabled the formation of the decagonal (d) as a consequence of Fe diffusion from the substrate. The surface microhardness of the cladding coatings is different from each other for specimens prepared with different parameters,owing to the difference of the phase composition.