纯钛空化水射流处理表面空蚀损伤

发布时间：2018-02-03 09:57

本文关键词： 空化水射流空蚀孪晶工业纯钛　出处：《航空材料学报》2015年04期 　论文类型：期刊论文

【摘要】：对工业纯钛表面进行不同时间的空化水射流处理,用光学显微镜和扫描电子显微镜对处理后试样的表面形貌、显微组织结构等进行了分析,并对空蚀损伤进行了研究。根据空蚀损伤程度和淹没式水射流的流动特性,可以把损伤区分为一次空化水射流损伤区和混合空化水射流损伤区。一次射流区在水射流处理5min时,表面就出现塑性变形坑、空蚀针孔和形变孪晶。随着水射流处理时间的延长(20~30min),在孪晶界等区域开始出现裂纹萌生和扩展,水射流处理60min时已出现表面金属大量剥落的严重损伤。混合射流区的损伤速度明显低于一次射流区,但在横截面金相组织中却出现比一次射流区密度更大、厚度更大的孪晶层。一次射流区的硬化层深度小于混合射流区。空化水射流处理5min到30min粗糙度迅速增加,30min后粗糙度上升缓慢,处理60min时,粗糙度达到2.92μm。
[Abstract]:The surface morphology and microstructure of the treated samples were analyzed by means of optical microscope and scanning electron microscope. According to the degree of cavitation damage and the flow characteristics of submerged water jet, the damage can be divided into single cavitation water jet damage zone and mixed cavitation water jet damage zone. The primary jet zone is treated with water jet for 5 min. Plastic deformation pits, cavitation holes and deformation twins appear on the surface. With the extension of water jet treatment time, crack initiation and propagation begin to occur in the twinning boundary. When treated with water jet for 60 min, serious damage of surface metal flaking occurred. The damage velocity in the mixed jet region was obviously lower than that in the primary jet zone, but the density in the metallographic structure of cross section was higher than that in the primary jet zone. The thicker twin layer. The hardened layer depth in the primary jet zone is smaller than that in the mixed jet zone. The roughness of cavitation water jet increases rapidly from 5 min to 30 min, and the roughness increases slowly after treatment for 60 min, and the roughness reaches 2.92 渭 m.
【作者单位】：大连交通大学材料科学与工程学院;大连华锐重工集团股份有限公司;
【分类号】：TG178;TG146.23
【正文快照】： 空化水中大量微小空泡群在金属表面溃灭时可产生很高的冲击波压力,使金属发生塑性变形[1,2]。Vtas等[3]较详尽地研究了面心立方金属的空蚀过程,发现在空蚀很短的时间内,金属就开始发生塑性变形,扫描电镜下晶界和滑移带显现,位错胞尺寸下降;同时表层硬度提高,微观应变提高,宏观

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