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首页> 外文会议>World Conference on Titanium v.2; 20030713-20030718; Hamburg; DE >A Study on Microstructure of Solution Treated and Aged SP-700 Titanium Alloy
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A Study on Microstructure of Solution Treated and Aged SP-700 Titanium Alloy

机译：固溶和时效处理SP-700钛合金的显微组织研究

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摘要

SP-700 with a nominal chemical composition of Ti-4.5Al-3V-2Fe-2Mo was originally developed for superior superplastic forming capability at temperatures below 800℃, but it has been proved that this alloy also shows other advantages such as improved heat treatability. A wide range of tensile strength can be attained by solution treatment and aging; up to 1400MPa by water quenching in solution treatment, and 1250MPa by air cooling. This alloy also exhibits very quick age hardening behavior in water quenched conditions. In this study, phase transformation of solution treatment and aging was investigated by SEM and TEM analysis, and the resultant tensile properties of heat treated SP-700 were discussed. Quick age hardening behavior in water quenched SP-700 may be promoted by the formation of ω phase in the solution treatment condition and quick transformation from ω to α phase by aging. Very fine secondary α precipitates were observed in the transformed β phase in water quenched and aged SP-700, and acicular α was observed in air cooled and aged SP-700. Transformation in β phase plays a significant role in the strengthening behavior of this alloy, and morphology of precipitates in β phase also influences ductility. More void formations occur during deformation in air cooled SP-700, and water quenched SP-700 shows better ductility and higher notch tensile strength.
机译：SP-700的标称化学成分为Ti-4.5Al-3V-2Fe-2Mo最初是为了在800℃以下的温度下具有卓越的超塑性成形能力而开发的，但事实证明该合金还具有其他优点，例如改善了热处理性能。 。通过固溶处理和时效处理，可以获得广泛的拉伸强度；在固溶处理中通过水淬可以达到1400MPa，在空冷条件下可以达到1250MPa。这种合金在水淬条件下也表现出非常快的时效硬化行为。在这项研究中，通过SEM和TEM分析研究了固溶处理和时效的相变，并讨论了热处理后的SP-700的拉伸性能。通过在固溶处理条件下形成ω相以及通过时效从ω迅速转变为α相，可以促进水淬SP-700中快速的时效硬化行为。在SP-700淬火和老化的水中，在转化的β相中观察到非常细的二次α沉淀，而在风冷和老化的SP-700中观察到针状α。 β相的转变在该合金的强化行为中起着重要作用，β相中析出物的形态也会影响延展性。在空气冷却的SP-700的变形过程中，会形成更多的空隙，而水淬的SP-700表现出更好的延展性和更高的缺口拉伸强度。

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