(北京航空材料研究院， 北京100095)
摘 要: 研究了高強(qiáng)度鈦合金Ti-10V-2Fe-3Al表面噴丸強(qiáng)化所產(chǎn)生的表面形貌、 表面粗糙度、 表面殘余應(yīng)力和表面層殘余壓應(yīng)力場(chǎng)變化及噴丸對(duì)其拉-拉疲勞性能的影響。 結(jié)果表明： 噴丸強(qiáng)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(yīng)力場(chǎng)， 噴丸強(qiáng)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(yàn)結(jié)果證實(shí)了噴丸強(qiáng)化不僅可以顯著延長(zhǎng)高強(qiáng)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(qiáng)化后疲勞裂紋源由多個(gè)變?yōu)橐粋�(gè)。
關(guān)鍵字: 鈦合金； 疲勞； 噴丸； 殘余應(yīng)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
