表面处理对高强度的γ-TiAl合金在长期热暴露前、后疲劳性能的影响
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摘要
研究了电解抛光和电解抛光+喷丸两种表面强化工艺对高强度细晶粒合金Ti-44Al-5Nb-0.85W-0.85B在长期热暴露(10000 h、700℃)前、后疲劳行为的影响。结果表明:在热暴露前,电解抛光+喷丸处理相对于电解抛光处理更能有效地提高该合金的疲劳性能。热暴露后,相对于电解抛光+喷丸,电解抛光的合金疲劳强度增加。在经历热暴露后,电解抛光处理的材料的疲劳强度有一定程度的提高。获得光滑无缺陷表面的电解抛光工艺比电解抛光+喷丸工艺更能有效地保持钛铝合金抗热暴露氧化的能力。
The effects of the two surface strengthening processes such as electropolishing and electropolishing+shot peening on the fatigue strength of high strength fine-grained alloy Ti-44Al-5Nb-0.85W-0.85B alloy before and after 10000 h at700 ℃ exposure were studied. The results show that before thermal exposure, the electropolishing+shot peening outperforms electropolishing for the fatigue properties of the alloys. After thermal exposure, the electropolishing outperforms the electropolishing+shot peening for the fatigue properties of the alloys. After thermal exposure, the fatigue strength of the alloy after electropolishing increases. The electropolishing process by which the alloy can obtain smooth surface without defects is more capable of retaining the thermal exposure oxidation resistane than that by electropolishing+shot peening process.
The effects of the two surface strengthening processes such as electropolishing and electropolishing+shot peening on the fatigue strength of high strength fine-grained alloy Ti-44Al-5Nb-0.85W-0.85B alloy before and after 10000 h at700 ℃ exposure were studied. The results show that before thermal exposure, the electropolishing+shot peening outperforms electropolishing for the fatigue properties of the alloys. After thermal exposure, the electropolishing outperforms the electropolishing+shot peening for the fatigue properties of the alloys. After thermal exposure, the fatigue strength of the alloy after electropolishing increases. The electropolishing process by which the alloy can obtain smooth surface without defects is more capable of retaining the thermal exposure oxidation resistane than that by electropolishing+shot peening process.
引文
[1]孙红亮,叶飞,黄泽文,等.等温热锻对铌锆TiAl合金组织和力学性能的影响[J].稀有金属,2009(4):472-477.
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[11]Huang Z W.Thermal stability of Ti-44Al-4Nb-4Zr-0.2Si-1Balloy[J].Intermetallics,2013,42(11):170-179.
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[13]Huang Z W,Hu W.Thermal stability of an intermediate strength fully lamellar Ti-45Al-2Mn-2Nb-0.8 vol.%TiB2alloy[J].Intermetallics,2014,54:49-55.
[14]Huang Z W.Thermal stability of Ti-44Al-4Nb-4Hf-0.2Si-1Balloy[J].Intermetallics,2013,37:11-21.
[15]Silcock J,Silcock J.An X-ray examination of the to phase in TiV,TiMo and TiCr alloys[J].Acta Metallurgica,1958,6(7):481-493.
[16]Zhang D,Dehm G,Clemens H.Effect of heat-treatments and hot-isostatic pressing on phase transformation and microstructure in aβ/B2 containingγ-TiAl based alloy[J].Scripta Materialia,2000,42(11):1065-1070.
[17]Huang Z W,Huang S.On the role of thermal exposure on the stress controlled fatigue behaviour of an intermediate strengthγ-TiAl based alloy[J].Materials Science&Engineering A,2015,636(1187):77-90.
[2]Djanarthany S,Viala J C,Bouix J.An overview of monolithic titanium aluminides based on Ti3Al and TiAl[J].Materials Chemistry and Physics,2001,72(3):301-319.
[3]Wu X.Review of alloy and process development of TiAl alloys[J].Intermetallics,2006,14(10/11):1114-1122.
[4]彭小敏,夏长清,王志辉,等.TiAl基合金高温氧化及防护的研究进展[J].中国有色金属学报,2010,20(6):78-79.
[5]赵振兴,孙红亮,黄泽文.长期热暴露对不同表面状态的Ti-44Al-5Nb-1W-1B合金疲劳性能的影响[J].中国有色金属学报,2015(6):1458-1464.
[6]孙才,黄泽文.不同表面加工状态对高强度γ-TiAl合金疲劳性能的影响[J].稀有金属材料与工程,2014(3):589-594.
[7]Wu X.The significance of acoustic emission during stressing of tial-based alloys.part 2:influence of cracks induced by pre-stressing on the fatigue life[J].Acta materialia,2001(8):71-79.
[8]Hyman M E,Mccullough C,Levi C G,et al.Evolution of boride morphologies in TiAl-B alloys[J].Metallurgical&Materials Transactions A,1991,22(7):1647-1662.
[9]陈霞,黄泽文.长期热暴露对含钨铌γ-TiAl合金疲劳及表面损伤容限的影响[J].中国有色金属学报.2016(6):1191-1197.
[10]Huang Z W,Cong T.Microstructural instability and embrittlement behaviour of an Al-lean,high-Nbγ-TiAl-based alloy subjected to a long-term thermal exposure in air[J].Intermetallics,2010,18(1):161-172.
[11]Huang Z W.Thermal stability of Ti-44Al-4Nb-4Zr-0.2Si-1Balloy[J].Intermetallics,2013,42(11):170-179.
[12]Lindemann J,Buque C,Appel F.Effect of shot peening on fatigue performance of a lamellar titanium aluminide alloy[J].Acta Materialia,2006,54(4):1155-1164.
[13]Huang Z W,Hu W.Thermal stability of an intermediate strength fully lamellar Ti-45Al-2Mn-2Nb-0.8 vol.%TiB2alloy[J].Intermetallics,2014,54:49-55.
[14]Huang Z W.Thermal stability of Ti-44Al-4Nb-4Hf-0.2Si-1Balloy[J].Intermetallics,2013,37:11-21.
[15]Silcock J,Silcock J.An X-ray examination of the to phase in TiV,TiMo and TiCr alloys[J].Acta Metallurgica,1958,6(7):481-493.
[16]Zhang D,Dehm G,Clemens H.Effect of heat-treatments and hot-isostatic pressing on phase transformation and microstructure in aβ/B2 containingγ-TiAl based alloy[J].Scripta Materialia,2000,42(11):1065-1070.
[17]Huang Z W,Huang S.On the role of thermal exposure on the stress controlled fatigue behaviour of an intermediate strengthγ-TiAl based alloy[J].Materials Science&Engineering A,2015,636(1187):77-90.