时效处理对WC/Cu-Ni-Mn堆焊层耐磨损性能影响
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摘要
通过对比未时效与时效后WC/Cu-Ni-Mn堆焊层的微观组织、界面及耐磨损性能,研究时效处理对其耐磨损性能的影响规律,并揭示其耐磨损机理.结果表明,未时效和时效后的WC/Cu-Ni-Mn涂层相对耐磨损性能分别是时效后Cu-Ni-Mn基体的170.72和210.77倍,时效后涂层耐磨性能提升了23.5%;时效处理后Cu-Ni-Mn金属基中析出了NiMn第二相,基体硬度提升了2.3倍,从而为WC颗粒增强相提供了更稳定支撑;而未时效的Cu-NiMn合金中Ni,Mn原子固溶到Cu晶格,形成了一种α-Cu固溶体;未时效和时效后WC/Cu-Ni-Mn的主要磨损机理均为磨粒磨损和黏着磨损.
The microstructure,interface and anti-wear performance of WC/Cu-Ni-Mn hardfacing coatings with and without age-hardening were compared and analyzed.The influence of the aging treatment on the anti-wear performance and wear mechanisms of WC/Cu-Ni-Mn coatings were investigated.The results showed that relative wear-resistances of WC/Cu-Ni-Mn hardfacing coatings with and without agehardening treatment were 170.72 and 210.77 times as much as the aged Cu-Ni-Mn matrix,which increased by 23.5%.After aging,the NiMn phase precipitated in the Cu-Ni-Mn alloy and its hardness increased by 2.3 times.As for the Cu-Ni-Mn metal matrix without the age-hardening,the elements of Ni and Mn dissolved in copper and then formed the α-Cu solid solutions.The main wear mechanisms of coating with and without age-hardening were adhesion and abrasion.
The microstructure,interface and anti-wear performance of WC/Cu-Ni-Mn hardfacing coatings with and without age-hardening were compared and analyzed.The influence of the aging treatment on the anti-wear performance and wear mechanisms of WC/Cu-Ni-Mn coatings were investigated.The results showed that relative wear-resistances of WC/Cu-Ni-Mn hardfacing coatings with and without agehardening treatment were 170.72 and 210.77 times as much as the aged Cu-Ni-Mn matrix,which increased by 23.5%.After aging,the NiMn phase precipitated in the Cu-Ni-Mn alloy and its hardness increased by 2.3 times.As for the Cu-Ni-Mn metal matrix without the age-hardening,the elements of Ni and Mn dissolved in copper and then formed the α-Cu solid solutions.The main wear mechanisms of coating with and without age-hardening were adhesion and abrasion.
引文
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[4]Bao J,Newkirk J W,Bao S.Wear-resistant WC composite hard coatings by brazing[J].Journal of Materials Engineering and PerFormance,2004,13(4):385-388.
[5]周庆军.铸造碳化钨颗粒增强铜基复合材料的研究[D].西安:长安大学,2002.
[6]Polyakova N A,Udovenko V A,Chichua E D.The structure,deformation mechanism and strength properties of ageing Cu-Ni-Mn alloys[J].Physics of Metals and Metallography,1991,71(1):171-179.
[7]Weatherill A E,Buckley R A.Phase transformations and ageing phenomena in copper-nickel-manganese alloys[C]//Symposium GREECE-Phase Transformations in Solids.London:Cambridge University Press,1983,531-536.
[8]Liu J,Yang S,Xia W,et al.Microstructure and wear resistance performance of Cu-Ni-Mn alloy based hardfacing coatings reinforced by WC particles[J].Journal of Alloys and Compounds,2016,654:63-70.
[9]Callister W D,Rethwisch D G.Materials science and engineering:an introduction[M].New York:Wiley,2007.
[10]潘奇汉.高弹性Cu-20Ni-20Mn合金[J].中国有色金属学报,1996,6(4):91-95.Pan Qihan.A highly elastic Cu-20Ni-20Mn alloy[J].The Chinese Journal of Nonferrous Metals,1996,6(4):91-95.
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[15]Kim C K,Lee S,Jung J,et al.Effects of complex carbide fraction on high-temperature wear properties of hardfacing alloys 1reinforced with complex carbides[J].Materials Science and Engineering:A,2003,349(1-2):1-11.
[16]Dhanasekaran S,Gnanamoorthy R.Microstructure,strength and tribological behavior of Fe-C-Cu-Ni sintered steels prepared with MoS2 addition[J].Journal of Materials Science,2007,42(12):4659-4666.
[17]安同邦,Gong Karin,骆合力,等.碳化铬/Ni_3Al复合堆焊层组织及摩擦磨损分析[J].焊接学报,2012,33(2):101-104.An Tongbang,Gong Karin,Luo Heli,et al.Analysis on microstructure and friction wear performance of chromium carbide/Ni3Al composite surfacing layer[J].Transactions of the China Welding Institution,2012,33(2):101-104.
[18]Zhu Y,Yukimura K,Ding C,et al.Tribological properties of nanostructured and conventional WC-Co coatings deposited by plasma spraying[J].Thin Solid Films,2001,388(1):277-282.
[19]Kumar P R S,Kumaran S,Rao T S,et al.High temperature sliding wear behavior of press-extruded AA6061/fly ash composite[J].Materials Science and Engineering:A,2010,527(6):1501-1509.