W元素对CrWMn铁基TIG焊熔敷层耐液态PbBi腐蚀性能的影响  

Effect of W element on corrosion resistance of CrWMn iron-based cladding layer in liquid lead bismuth eutectic by TIG

作　　者：黄飞[1] 雷玉成[1] 张鑫[1] 刘发强[1] 朱强[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《功能材料》2016年第12期12189-12194,12201,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51375216);江苏大学高级人才启动基金资助项目(13JDG008)

摘　　要：研究了550℃时,CrWMn铁基熔敷层在动态液态PbBi共晶合金（LBE）中的耐磨耐蚀性能以及钨化物对其的影响。4个W含量不同的试样放置在相同流速处。4个试样均出现明显的腐蚀,元素溶解,以及少量的PbBi渗透。熔敷层表面均生成双氧化层,外层为疏松多孔的Fe3O4,内层为致密的FeCr2O4和（Fe0.6Cr0.4）2O3,且内外层均含少量的钨化物。WC添加量在3.73%-5.33%时,熔敷层显微硬度值最大,外层厚度较大,磨损较少,内层厚度较小。含量适中的钨化物提高了熔敷层耐蚀耐磨性能,保护熔敷层下铸造316L构件表面。The corrosion and wear resistance of CrWMn iron-based cladding layer in dynamic lead bismuth eutectic （LBE）at 550 ℃ and the effect of tungsten compound was researched in this paper.Four samples were placed at the location where the velocity was equal.After test,obvious corrosion,dissolution of components and a little PbBi penetration is observed on the surface of four samples.A double layer oxide film which consists of a loose and porous Fe3 O4 outer layer and a dense FeCr2O4 and （Fe0.6Cr0.4 ）2 O3 inner layer forms and contains a little tungsten compound.When the content of WC is between 3.73% and 5.33%,the microhardness of the cladding layer is the highest,and the thickness of the outer layer becomes bigger while that of the inner layer decreases, and the corrosion and wear is relatively less.Moderate tungsten compound could distinctly increase corrosion and wear resistance of the cladding layer and protect the surface of cast 316L components well.

关 键 词：CrWMn铁基熔覆层 铅铋共晶体 钨化物 腐蚀 双氧化层 

分 类 号：TG172.6[金属学及工艺—金属表面处理]