【摘要】：通過脈沖激光熔覆技術(shù)在低碳鋼表面上制備高致密鐵基非晶合金涂層,研究了不同脈沖頻率對(duì)涂層組織與性能的影響。利用光學(xué)顯微鏡(OM)、X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)、顯微硬度儀、電化學(xué)工作站等測(cè)試方法分別分析了涂層成形、組織特征、顯微硬度與耐腐蝕性能。研究結(jié)果表明,涂層主要由非晶組成,隨脈沖頻率降低,涂層厚度減小,稀釋率降低,非晶化程度升高;當(dāng)脈沖頻率為1.0 Hz時(shí),涂層稀釋率顯著降低50%,且未析出明顯結(jié)晶相。隨脈沖頻率降低,熔合區(qū)寬度減小,柱狀晶沿外延生長(zhǎng)趨勢(shì)變小,涂層顯微硬度表現(xiàn)為先增加后減小,耐腐蝕性能先明顯增強(qiáng)后減弱,且在3.5%NaCl溶液中耐腐蝕性能明顯優(yōu)于316L不銹鋼。當(dāng)脈沖頻率為1.0 Hz時(shí),涂層結(jié)構(gòu)致密,平均顯微硬度最高,達(dá)HV 1315,約為基材的9倍,涂層自腐蝕電流密度及鈍化電流密度最低,分別為1.81×10~(-8),7.10×10~(-7)A·cm~(-2),耐蝕性能表現(xiàn)最強(qiáng)。
[Abstract]:High density Fe-based amorphous alloy coatings were prepared on the surface of low carbon steel by pulsed laser cladding. The effect of different pulse frequencies on the microstructure and properties of the coatings was studied. The forming, microstructure, microhardness and corrosion resistance of the coating were analyzed by means of (OM) X-ray diffractometer, (XRD), scanning electron microscope, (SEM), microhardness tester and electrochemical workstation. The results show that the coating is mainly composed of amorphous, with the decrease of the pulse frequency, the thickness of the coating decreases, the dilution rate decreases and the degree of non-crystallization increases, and when the pulse frequency is 1.0 Hz, the dilution rate of the coating decreases significantly by 50% and the crystalline phase is not precipitated. With the decrease of pulse frequency, the width of fusion zone decreases, and the growth trend of columnar crystal along the epitaxial growth becomes smaller. The microhardness of the coating increases first and then decreases, and the corrosion resistance first increases and then weakens. The corrosion resistance in 3.5%NaCl solution is better than that in 316L stainless steel. When the pulse frequency is 1.0 Hz, the coating structure is compact and the average microhardness is the highest, which is about 9 times of that of the substrate, and the self-corrosion current density and passivation current density of the coating are the lowest (1.81 脳 10 ~ (-8) and 7.10 脳 10 ~ (-7) A cm ~ (-2), respectively. The corrosion resistance of the coating is the strongest.
【作者單位】： 南昌航空大學(xué)輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室;北京科技大學(xué)新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室;江西省電力設(shè)備總廠;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51461031) 江西省教育廳基金項(xiàng)目(GJJ150733);江西省教育廳科技落地計(jì)劃項(xiàng)目(KJLD14055,20161BBH80031)資助 國(guó)家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(2013-Z05) 北京市自然科學(xué)基金項(xiàng)目(2142022)
【分類號(hào)】：TG174.4

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