(1. 大連理工大學 材料科學與工程學院，大連 116085；2. 北京航空制造工程研究所，北京 100024)
摘 要: 采用陶瓷濕噴丸強化工藝對Ti-6Al-4V合金進行表面處理。結(jié)果表明：經(jīng)濕噴丸后，材料表面硬度由330HV提高到416HV；表面粗糙度由原始的0.35 μm增大到0.48 μm，較傳統(tǒng)的干噴丸相比，粗糙度值小一個數(shù)量級；表面殘余應力達?749 MPa，且最大壓應力位于最表層，殘余壓應力層深度約為120 μm；拉?拉疲勞強度由605 MPa提高到680 MPa。微觀組織分析表明：噴丸處理后鈦合金表層位錯密度顯著增加，晶粒細化，基面織構由(100)向(101)轉(zhuǎn)變。陶瓷濕噴丸強化處理可提高Ti-6Al-4V合金的疲勞強度。
關鍵字: Ti-6Al-4V；濕噴丸；微觀組織；殘余應力；疲勞性能
（1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;
2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China）
Abstract:Ti-6Al-4V alloy was treated by the wet shot peening using ceramic beads. The results demonstrate that after the wet shot peening the surface hardness increases from 330HV to 416HV. The surface roughness of the alloy increases from 0.34 μm to 0.48 μm during the wet shot peening. After being treated by the wet shot peening, the surface roughness is an order of magnitude lower than that treated by the traditional dry shot peening. The maximum residual compressive stress value in the peened surface reaches ?749 MPa and the depth of the residual compressive layer is about 120 μm. The fatigue strength increases from 605 MPa to 680 MPa measured by the tension-tension fatigue test. The dislocation density is enhanced remarkablely in the surface layer after the wet shot peening by using ceramic beads. Also, the microstructure is obviously refined into ultra-fine grains in the surface layer. After the treatment the base surface texture changes from (100) to (101). The wet shot peening using the ceramic beads can improve the fatigue strength of Ti-6Al-4V alloy.
Key words: Ti-6Al-4V alloy; wet shot peening; microstructure; residual stress; fatigue property
