【摘要】：目的提高45#鋼的表面性能。方法利用IPG光纖激光加工系統(tǒng),采用不同的工藝參數(shù)在45#鋼表面激光熔覆自熔性鎳基碳化鎢粉末,對(duì)熔覆層的宏觀表面(平整度、表面硬度、裂紋情況)及金相組織、顯微硬度分布進(jìn)行對(duì)比分析。結(jié)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(shí),獲得的熔覆層宏觀表面相對(duì)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,熔覆層及界面處無裂紋、氣孔等缺陷,熔覆層中上部組織晶粒細(xì)小,沿熔覆層與基體交界處向外,晶粒呈現(xiàn)柱狀晶及等軸晶,組織性能良好,基體與熔覆層間冶金結(jié)合比較牢固。熔覆層顯微硬度分布比較均勻,并且與基體相比提高了約1.5倍。結(jié)論 45#鋼表面機(jī)械性能得到提升,在其表面激光熔覆自熔性鎳基碳化鎢粉末具有可行性和研究價(jià)值。
[Abstract]:Objective to improve the surface properties of 4 # steel. Methods by using IPG optical fiber laser processing system, laser cladding nickel based tungsten carbide powder with different technological parameters was used on the surface of 4steel. The macroscopic surface (smoothness, surface hardness, crack) and metallographic structure of the cladding layer were studied. The microhardness distribution was compared and analyzed. Results when the laser power is 1200 W and the scanning speed is 2 mm/s, the macroscopic surface of the cladding layer is relatively smooth and smooth, and the average Rockwell hardness is about 2.5 times of that of the substrate. The microstructure analysis shows that there are no cracks, pores and other defects in the cladding layer and the interface, and the microstructure of the upper part of the cladding layer is fine, along the interface between the cladding layer and the matrix, the grain appears columnar and equiaxed crystal, and the microstructure and properties are good. The metallurgical bond between the matrix and the cladding is relatively strong. The microhardness distribution of the cladding layer is uniform and 1.5 times higher than that of the substrate. Conclusion the mechanical properties of 4steel surface have been improved, and laser cladding self-fluxing nickel base tungsten carbide powder on its surface is feasible and valuable.
【作者單位】： 遼寧工業(yè)大學(xué)機(jī)械工程與自動(dòng)化學(xué)院;日照港油品碼頭有限公司;
【基金】：國家科技支撐計(jì)劃項(xiàng)目(2012BAF12B08-5)~~
【分類號(hào)】：TG174.4

【參考文獻(xiàn)】

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