等离子熔敷铁基合金涂层组织和性能  

Microstructures and properties of iron-base coatings prepared by plasma cladding

作　　者：马国[1,2] 王灿 张立平[1,2] 黄松 孟庆禹[1,2] MA Guo;WANG Can;ZHANG Liping;HUANG Song;MENG Qingyu(JiangsuXuzhou Engineering Machinery Research Institute,Xuzhou 221004,China;State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery,XCMG Construction Machinery Co.,Ltd.,Xuzhou 221004,China)

机构地区：[1]江苏徐州工程机械研究院,江苏徐州221004 [2]徐工集团工程机械有限公司高端工程机械智能制造国家重点实验室,江苏徐州221004

出　　处：《电焊机》2018年第4期36-41,共6页Electric Welding Machine

摘　　要：分析不同成分下铁基合金熔敷层的组织和性能,为工业应用奠定基础。采用等离子喷焊设备制备铁基合金熔敷层,并对表面渗透探伤,检验表面裂纹。采用火花直读光谱仪检测熔敷层化学成分,分析化学成分对显微组织的影响。采用洛氏硬度计及销盘式摩擦磨损试验机检测硬度及磨损失重,分析显微组织对硬度及耐磨性的影响。结果表明,当Creq/Nieq值为0.26时,熔敷层表面出现裂纹。Creq和Nieq影响熔敷层显微组织,基体以奥氏体为主。5种合金堆焊层硬度均大于40 HRC,并且Creq/Nieq值与硬度及耐磨性没有线性关系。随着硬度的增加耐磨性提高,Fe5的耐磨性最好,磨损失重只有3.65g。但当硬度达到59 HRC时,耐磨性降低。因此熔敷层的化学成分特别是w(C)决定了显微组织,w(C)的增加使熔敷层出现M_7C_3等硬质相,硬度及耐磨性提高,当硬度达到一定值时,出现裂纹,硬质相易脱落,导致耐磨性下降。In order to provide helps for industrial applications,this paper studied the microstructures and properties of iron-base powder of different compositions.First,iron-based alloy coatings were prepared by plasma spray equipment,and then cracks on surface of coatings were tested by penetrant testing.Second,chemical compositions were tested by direct reading spectrometer,and then analysis the influences of chemical compositions on microstructures.last,Rockwell hardness and wear quantity of iron-base powder coatings were tested by Rockwell hardness tester and pin-on-disk wear testing machine,and then study the influences of microstructures on hardness and wear.Through above tests,we found that,firstly when the value of Creq/Nieq is 0.26,crack appears on the surface of coating.Secondly microstructures are influenced by the values of Creq and Nieq,so the matrix is mainly austenitic.Thirdly there is no linear relationship between Creq/Nieq of hardness and wear resistance,and the hardness of five iron-base powder is all above 40 HRC.Fourthly,the wear resistance of coatings increases with the increase of hardness,and the wear loss of Fe5 is only 3.65 g,but when the hardness of iron-base powder reaches 59 HRC,wear resistance decreases.So,according to the above research,we can believe that the chemical compositions of the claddings determine microstructures,especially c content.When the carbon contents increase,hardening phase is formed in coatings,such as M7C3,so hardness and wear resistance are higher.But,when the hardness reaches a certain value,the appearance of crack causes the hard phases spall,wear resistance decreases.

关 键 词：铁基合金 等离子喷焊 渗透探伤 显微组织 洛氏硬度 耐磨性 

分 类 号：TG456.2[金属学及工艺—焊接]