等径角挤压后Ti5553钛合金的冲蚀磨损机理演变  

Erosion Mechanism Evolution of Ti5553 Treated by Equal Channel Angular Extrusion

作　　者：李振华[1] 华晨[2] 程先华[2,3] 

机构地区：[1]浙江海洋学院船舶与海洋工程学院,浙江舟山316022 [2]上海交通大学机械与动力工程学院,上海200240 [3]清华大学摩擦学国家重点实验室,北京100084

出　　处：《摩擦学学报》2015年第1期45-52,共8页Tribology

基　　金：国家自然科学基金(51205359);清华大学摩擦学国家重点实验室开放基金(SKLTKF13A06)资助~~

摘　　要：本文中系统研究了经等径角挤压(ECAE)处理后的Ti5553钛合金在海砂环境中的冲蚀磨损机理演变历程和失效原因.发现Ti5553钛合金在高角度冲蚀工况下,其冲蚀磨损机理从初期的微切削转变为冲击挤压变形,并保持稳定;合金显微组织中弥散的α相以及ECAE工艺影响了冲蚀机理演变过程及冲蚀磨损程度;提高合金的强度、韧塑性对于抵抗冲蚀磨损起到了促进作用.The paper presents a systematic research work to study the erosion mechanism evolution of an equal channel angular extrusion( ECAE) treated Titanium alloy Ti5553 exposed to seawater with quartz sand,and the corresponding failure mode of the alloy. It is found that the erosion mechanism micro-cutting,appearing in the early stage,transformed into impact deformation and then kept time invariant at high impinging angle. ECAE processing and the dispersive α-phase,a characteristic microstructure in Ti5553,had influence on the erosion mechanism evolution and the magnitude of erosion wear. It is the increasing of strength,toughness and ductility of Ti5553 that contributed to the improved slurry erosion resistance.

关 键 词：等径角挤压 细晶强化 冲蚀磨损机理 机理演变 Ti5553钛合金 三维轮廓 

分 类 号：TG379[金属学及工艺—金属压力加工]