(北京航空材料研究院， 北京100095)
摘 要: 研究了高強度鈦合金Ti-10V-2Fe-3Al表面噴丸強化所產(chǎn)生的表面形貌、 表面粗糙度、 表面殘余應力和表面層殘余壓應力場變化及噴丸對其拉-拉疲勞性能的影響。 結果表明： 噴丸強化可使Ti-10V-2Fe-3A鈦合金的表面粗糙度減小和表面層產(chǎn)生一定深度的殘余壓應力場， 噴丸強化引起的表面完整性的改善顯著提高了疲勞性能。 疲勞試驗結果證實了噴丸強化不僅可以顯著延長高強度鈦合金Ti-10V-2Fe-3Al的拉-拉高周疲勞壽命， 而且可使1×107周次下的疲勞極限提高約30%， 且表面噴丸強化后疲勞裂紋源由多個變?yōu)橐粋€。
關鍵字: 鈦合金； 疲勞； 噴丸； 殘余應力
in Ti-10V-2Fe-3Al titanium alloy
（ Institute of Aeronautical Materials, Beijing 100095, China）
Abstract: The changes of surface topography, surface roughness, surface residual stress and compressive residual stress field caused by shot peening and their effects on tension-tension fatigue properties in Ti-10V-2Fe-3Al titanium alloy were studied. The results show that the fatigue limit for 1×107 cycles is improved by about 30% with shot peening and confirm that shot peening can improve tension-tension fatigue properties of metals. Moreover, fatigue crack source is single after shot peening. The reason why tension-tension fatigue properties of metals can be modified by shot peening is that the surface integrity such as better surface finish roughness and beneficial compressive residual stress field can be induced by shot peening.
Key words: titanium alloy; fatigue; shot peening; residual stress
