冷速对等温锻造TC25钛合金盘件显微组织和性能的影响
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摘要
研究了TC25钛合金盘件在β相区等温锻造后,不同的冷却速率对显微组织和力学性能的影响。结果表明,锻后空冷得到粗大的片状组织,并有大块的α相出现;锻后水冷可以获得细小、相互交织的网篮组织,未出现明显的块状α相。与空冷相比,β锻造后水冷的盘件室温强度、热暴露后的室温强度以及500℃和550℃的高温强度均有明显提高,塑性基本保持不变或有所提高。可见,TC25钛合金β锻造后水冷是改善强度和塑性的有效方法。
The effect of cooling rate on microstructure and mechanical properties of β isothermal forged TC25 titanium alloy disk is studied. The results show that air cooling after forging,blocky α phases precipitate within coarse β grains.The fine and basket phases with no obvious α phase can be obtained after water quenching. Compared with air cooling after forging,tensile strength at room temperature,after thermal exposure and at high temperature(500 ℃ and 550 ℃)have improved after water quenching,and the ductility does not decrease but even increases. Hence,it is concluded that water quenching after forging is one of the effective way for improving the strength and ductility of TC25 titanium alloy.
The effect of cooling rate on microstructure and mechanical properties of β isothermal forged TC25 titanium alloy disk is studied. The results show that air cooling after forging,blocky α phases precipitate within coarse β grains.The fine and basket phases with no obvious α phase can be obtained after water quenching. Compared with air cooling after forging,tensile strength at room temperature,after thermal exposure and at high temperature(500 ℃ and 550 ℃)have improved after water quenching,and the ductility does not decrease but even increases. Hence,it is concluded that water quenching after forging is one of the effective way for improving the strength and ductility of TC25 titanium alloy.
引文
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[5]Lütjering G.Influence of processing on microstructure and mechanical properties of(α+β)titanium alloys[J].Materials Science&Engineering A,1998,243(1/2):32-45.
[6]李晓芹.钛合金β锻造组织不均匀性研究[J].金属热处理,2000(3):17-20.
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[8]Gil F J,Ginebra M P,Manero J M,et al.Formation ofα-Widmansttten structure:effects of grain size and cooling rate on the Widmansttten morphologies and on the mechanical properties in Ti6 Al4 V alloy[J].Journal of Alloys&Compounds,2001,329(1):142-152.
[9]石德坷.材料科学基础[M].北京:机械工业出版社,2002.
[10]曾卫东,周义刚.冷速对TC11合金β加工显微组织和力学性能的影响[J].金属学报,2002,38(12):1273-1276.
[11]李晓芹.TC11钛合金β锻造工艺、组织和性能的关系[J].机械科学与技术,2000,19(1):127-129.
[12]Leyens C,Peters M.Titanium and titanium alloys:fundamentals and applications[M].Weinheim:Wiley-VCH,2003:339-346.
[13]陈军,赵永庆,曾卫东,等.退火工艺对Ti700钛合金冲击韧性的影响[J].金属热处理,2007,32(7):69-71.