WC添加量对等离子堆焊制备的FeCrNiSiB堆焊层组织与性能的影响  

Effect of WC Additions on Microstructure and Properties of Fecrnisib Surfacing Layer Prepared by Plasma Surfacing

作　　者：邴绍旺 谭华 王新宁 秦升杰 纪鹏 于青 王现杰 BING Shaowang;TAN Hua;WANG Xinning;QIN Shengjie;JI Peng;YU Qing;WANG Xianjie(Qingdao GOSCI Technology Group(previously named"Qingdao National Laboratory for Marine Science and Technology Co.,Ltd."),Qingdao 266237,China;SunRui Marine Environment Engineering Company Ltd.,Qingdao 266237,China;National Center for Marine Equipment Quality Inspection&Testing Materials Analysis Laboratory,Qingdao 266237,China)

机构地区：[1]青岛国实科技集团有限公司(原“青岛海洋科学与技术国家实验室有限公司”),山东青岛266237 [2]青岛双瑞海洋环境工程股份有限公司,山东青岛266237 [3]国家海洋设备质检中心材料分析实验室,山东青岛266237

出　　处：《材料开发与应用》2024年第6期44-52,共9页Development and Application of Materials

基　　金：青岛海洋科学与技术试点国家实验室“十四五”重大项目(20220NLM030001-4)。

摘　　要：采用等离子堆焊技术在船用Q235低碳钢表面制备不同添加量(质量分数,下同)WC粉末改性的FeCrNiSiB堆焊层,研究了WC添加量对FeCrNiSiB堆焊层组织、显微硬度及摩擦磨损性能的影响。结果显示,FeCrNiSiB堆焊试样的截面分为堆焊层、熔合区和基体三层结构,堆焊层的主要物相包括Cr_(23)C_(6)、Cr_(3)Fe_(14)C、C和WC等。黑色和白色两相在堆焊层互相掺杂,其中白色相为低熔点的合金黏结相,其组成元素主要为Fe、C及少量Cr、W,黑色相为高熔点的碳化物强化相,与白色相相比,其Fe含量较低而W、C和Cr含量较高,WC粉末添加量的增加提高了碳化物强化相的体积占比;堆焊层的显微硬度随着WC添加量的增加而增加,且堆焊层底部的硬度高于上部的;堆焊层的摩擦系数稳定在0.55~0.65之间,且随着WC添加量的增加,堆焊层的摩擦系数先降低后增加;堆焊电流为130 A、WC添加量为30%的FeCrNiSiB堆焊层具有最好的摩擦磨损性能。FeCrNiSiB surfacing layers with different mass fractions of WC powders are prepared on surface of Q235 low-carbon steel used in ships by plasma surfacing method,and the effects of WC addition on the microstructure,hardness and friction and wear properties of the FeCrNiSiB surfacing layer are investigated.Results show that the cross section of the surfacing specimen consists of three parts,which are the surfacing layer,fusion zone and matrix.The phases in the surfacing layer include Cr_(23)C_(6),Cr_(3)Fe_(14)C,C and WC.Black and white phases are alternately distributed in the surfacing layer.The white phase is alloy binding phase with low melting point,which has a large amount of Fe and C elements,and a small amount of Cr and W.Compared with the white phase,the black phase is carbide strengthening phase with high melting point,with a small amount of Fe element and a large amount of W,C and Cr elements,and the addition of WC powders promote the volume ratio of the carbide strengthening phase.The hardness of the surfacing layer rises with the increase of the WC addition,and the hardnesses in the lower zone of the surfacing layer are higher than that in the upper part.The friction coefficient of the surfacing layer remains between 0.55 and 0.65,and with the increase of WC addition,the friction coefficient decreases first and then increases.The FeCrNiSiB surfacing layer prepared with WC addition of 30%and the welding current of 130 A has the best friction and wear performance.

关 键 词：等离子堆焊 FeCrNiSiB WC 组织 硬度 摩擦磨损性能 

分 类 号：TG455[金属学及工艺—焊接]