Fe基氩弧重熔涂层的制备及其磨损性能研究
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摘要
目的制备高质量的Fe基氩弧重熔涂层,并探究氩弧重熔处理对涂层在不同载荷作用下磨损性能的影响。方法通过正交试验对Fe基重熔层的4个主要重熔参数(电流、速度、弧长、步长)进行优化设计,采用孔隙率和显微硬度作为指标来综合评价涂层的质量。利用X射线衍射仪对涂层进行物相分析,利用UMT-3多功能摩擦磨损试验机测试涂层的耐磨性,利用白光干涉三维表面轮廓仪对磨痕进行表征,利用扫描电镜分析了粉末形貌、涂层的微观结构和涂层的失效形貌。结果通过正交试验获得了高质量的Fe基氩弧重熔涂层,其最优重熔工艺参数为:重熔电流70 A,速度200 mm/min,弧长2 mm,步长2 mm。随着磨损载荷的增加,喷涂层和重熔层的摩擦系数均增大,但在相同的载荷作用下,重熔层的摩擦系数小于喷涂层。喷涂层的主要失效模式为剥落和磨粒磨损,呈现出脆性断裂特征;重熔层的主要失效形式为粘着磨损和疲劳磨损,呈现出塑性变形和犁沟特征。在10、20、30、40 N载荷作用下,重熔层的磨损体积分别比喷涂层降低了32.1%、51.5%、60.7%和55.7%。结论通过氩弧重熔处理,得到了高质量的Fe基重熔层,与原Fe基喷涂层相比,其显微组织和耐磨性得到显著改善。
The work aims to prepare high quality Fe-based argon arc remelting coating and study the effect of argon arc remelting treatment on the wear properties of as-sprayed coating under different loads. Four main remelting parameters(current, velocity, arc length and step length) of Fe-based remelted coating were optimized by orthogonal test, and the porosity and microhardness were used as indicators to comprehensively evaluate the quality of Fe-based remelted coating. The phase composition of the coating was evaluated by X-ray diffraction, the wear resistance of the coating was tested by UMT-3 multi-function friction and wear tester, and wear scar was characterized by three dimensional surface profiler. The morphology of the powders, the microstructure of the coating and the failure morphology of the coatings were analyzed by scanning electron microscope(SEM). High quality Fe-based argon arc remelting coating could be obtained by orthogonal test, and the three main parameters optimized by orthogonal test were current of 70 A, speed of 200 mm/min, arc length of 2 mm and step length of 2 mm. With the increase of the experimental load, the friction coefficient of the as-sprayed coating and the remelted coating increased. While, the friction coefficient of the remelted coating was smaller than that of the as-sprayed coating under the same experimental load. The main failure modes of the as-sprayed coating were spalling and abrasive wear, showing the characteristics of brittle fracture. The main failure modes of the remelted coating were adhesive wear and fatigue wear, displaying the characteristics of plastic deformation and pear gully. The wear volume of the remelted coating respectively decreased by 32.1%, 51.5%, 60.7% and 55.7% than the as-sprayed coating under the load of 10、20、30 and 40 N. Therefore, the microstructure and wear resistance of Fe-based coating are greatly improved by argon arc remelting treatment, when compared with original Fe-based coating.
The work aims to prepare high quality Fe-based argon arc remelting coating and study the effect of argon arc remelting treatment on the wear properties of as-sprayed coating under different loads. Four main remelting parameters(current, velocity, arc length and step length) of Fe-based remelted coating were optimized by orthogonal test, and the porosity and microhardness were used as indicators to comprehensively evaluate the quality of Fe-based remelted coating. The phase composition of the coating was evaluated by X-ray diffraction, the wear resistance of the coating was tested by UMT-3 multi-function friction and wear tester, and wear scar was characterized by three dimensional surface profiler. The morphology of the powders, the microstructure of the coating and the failure morphology of the coatings were analyzed by scanning electron microscope(SEM). High quality Fe-based argon arc remelting coating could be obtained by orthogonal test, and the three main parameters optimized by orthogonal test were current of 70 A, speed of 200 mm/min, arc length of 2 mm and step length of 2 mm. With the increase of the experimental load, the friction coefficient of the as-sprayed coating and the remelted coating increased. While, the friction coefficient of the remelted coating was smaller than that of the as-sprayed coating under the same experimental load. The main failure modes of the as-sprayed coating were spalling and abrasive wear, showing the characteristics of brittle fracture. The main failure modes of the remelted coating were adhesive wear and fatigue wear, displaying the characteristics of plastic deformation and pear gully. The wear volume of the remelted coating respectively decreased by 32.1%, 51.5%, 60.7% and 55.7% than the as-sprayed coating under the load of 10、20、30 and 40 N. Therefore, the microstructure and wear resistance of Fe-based coating are greatly improved by argon arc remelting treatment, when compared with original Fe-based coating.
引文
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[2]QING Y H.Influence of molybdenum on the microstructure and properties of a FeCrBSi alloy coating deposited by plasma transferred arc hardfacing[J].Surface&coatings technology,2013,225:11-20.
[3]KANG J J,XU B S,WANG H D,et al.Delamination failure monitoring of plasma sprayed composite ceramic coatings in rolling contact by acoustic emission[J].Engineering failure analysis,2018,86:131-141.
[4]LIU L M,XIAO J K,WEI X L,et al.Effects of temperature and atmosphere on microstructure and tribological properties of plasma sprayed FeCrBSi coatings[J].Journal of alloys and compounds,2018,753:586-594.
[5]PIAO Z Y,XU B S,WANG H D,et al.Influence of undercoating on rolling contact fatigue performance of Fe-based coating[J].Tribology international,2010,43(1):252-258.
[6]CUI C,YE F X,SONG G R.Laser surface remelting of Fe-based alloy coatings deposited by HVOF[J].Surface&coatings technology,2012,206(8):2388-2395.
[7]PIAO Z Y,XU B S,WANG H D,et al.Characterization of Fe-based alloy coating deposited by supersonic plasma spraying[J].Fusion engineering and design,2013,88:2933-2938.
[8]KONG D J,SHENG TY.Wear behaviors of HVOFsprayed WC-12Co coatings by laser remelting under lubricated condition[J].Optics&laser technology,2017,89:86-91.
[9]WANG X H,ZOU Z D,SONG S L,et al.Microstructure and wear properties of in situ TiC/FeCrBSi composite coating prepared by gas tungsten arc welding[J].Wear,2006,260:25-29.
[10]田立辉,毛淑滑,芦笙,等.等离子喷涂-重熔Ni Cr BSi涂层的显微组织与耐磨性能[J].焊接学报,2016,37(6):89-94.TIAN L H,MAO S H,LU S,et al.Microstructure and wear-resistance of NiCrBSi coating sprayed-remelted by plasma process[J].Transactions of the China welding institution,2016,37(6):89-94.
[11]BOLELLI G,BONFERRONI B,LAURILA J,et al.Micromechanical properties and sliding wear behaviour of HVOF-sprayed Fe-based alloy coatings[J].Wear,2012,277:29-47.
[12]LI G L,LI Y L,DONG T S,et al.Microstructure and wear resistance of TIG remelted NiCrBSi thick coatings[J].Advances in materials science&engineering,2018,104:1-10.
[13]CHEN J B,DONG Y C,WAN L N,et al.Effect of induction remelting on the microstructure and properties of in situ TiN-reinforced NiCrBSi composite coatings[J].Surface&coatings technology,2018,340:159-166.
[14]DONG T S,ZHOU X K,LI G L,et al.Microstructure and corrosive wear resistance of plasma sprayed Ni-based coatings after TIG remelting[J].Materials research express,2018,5:77-80.
[15]KONG D J,ZHAO B G.Effects of loads on friction-wear properties of HVOF sprayed NiCrBSi alloy coatings by laser remelting[J].Journal of alloys and compounds,2017,705:700-707.
[16]YANG X C,LI G L,WANG H D,et al.Effect of flame remelting on microstructure and wear behaviour of plasma sprayed NiCrBSi-30%Mo coating[J].Surface engineering,2016,1:1-7.