YDCrMoV CO2气保护堆焊药芯焊丝的磨粒磨损性能

覆带式工程机械以其特有的结构特点在矿山、水利工程、道路工程发挥着巨大的经济效益。但由于其履带式行走系统在施工过程中，其引导轮与履带筋、支重轮与履带筋、托带轮与履带筋之间的不可避免地带入硬或软的沙砾，因此始终处于三体磨料磨损状态。而其履带板与矿石、砂土之间处于硬磨料或松散磨料的两体磨料磨损状态。因此其行走系统磨损严重，最终导致磨损失效。对其行走系统进行堆焊修复无疑具有重要意义。本文利用ＭＬＳ－２３型湿砂橡胶轮式磨损试验机、扫描电和透射电镜对所开发的用于履带式工程机械行走梦见堆焊修复用ＣＯ２气保护药芯焊丝的熔敷金属磨粒磨损性能进行了试验研究。结果表明，１、２号焊丝熔敷金属的磨损主要是微观切削，而３、４号焊丝熔敷金属的磨损则是多次塑变磨损机理占据主导地位。

Abrasive Wear of Cladding Metal of YDCrMoV CO2 Shielded Flux-cored Wire

The abrasives wear of metal of four CO₂ shielded flux-cored wire for repairing of caterpillar engineering machine was studied experimentally on a MLS-23 wet sand abrasive tester. The surface of abrasive wear specimen and its microstructure were investigated by transmitting electron microscopy (TEM) after completion of wear test. The study shows that the wear mechanisms of cladding metal of flux-cored wire No.1 and No.2 was microcutting and that of flux-cored wire No.3 and No.4 was microploughing. The four flux-cored wires make a great progress in repairing of caterpillar engineering machine in the Three Gorges Engineering.