熱等靜壓參數對Ti-5Al-2.5Sn ELI粉末合金組織與性能的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-05-04
采用無坩堝感應熔煉超聲氣體霧化法制備 Ti-5Al-2.5Sn ELI 預合金粉末, 并對預合金粉末進行表征. 研究了熱等靜壓參數對 Ti-5Al-2.5Sn ELI 粉末合金顯微組織和力學性能的影響.
熱等靜壓參數對Ti-5Al-2.5Sn ELI粉末合金組織與性能的影響EFFECT OF HOT ISOSTATIC PRESSING PARAMETERS ON?MICROSTRUCTURE AND MECHANICAL PROPERTIES OF POWDER?METALLURGY Ti-5Al-2.5Sn ELI ALLOY采用無坩堝感應熔煉超聲氣體霧化法制備 Ti-5Al-2.5Sn ELI 預合金粉末, 并對預合金粉末進行表征. 研究了熱等靜壓參數對 Ti-5Al-2.5Sn?ELI 粉末合金顯微組織和力學性能的影響. 結果表明, 熱等靜壓溫度/壓力的升高有助于提升粉末合金的致密度, 當粉末合金的致密度大于 99.5%時,?粉末合金的力學性能可以達到鍛造合金的水平. 綜合考慮粉末合金的致密度、顯微組織和力學性能, Ti-5Al-2.5Sn ELI預合金粉末優選的熱等靜壓工藝成型窗口為溫度890~940 ℃, 壓力120 MPa以上, 保溫保壓3 h. 包套對熱等靜壓壓力有屏蔽作用, 設計不當會降低粉末壓坯的致密度. 通過優化包套設計、熱等靜壓參數和工藝途徑可以有效抑制包套的屏蔽作用, 提升粉末合金的致密度。Near-net-shape forming through powder metallurgy (PM) route is a cost-efficient approach to?produce the hard-to-machining materials such as titanium alloys. Hot isostatic pressing (HIPing) is a common?technique to fabricate PM titanium alloys and?components. Prealloyed powder metallurgy through?HIPing is considered as upgrade of precision casting for?titanium alloys. Ti-5Al-2.5Sn ELI (extra-low interstitial)?is a typical α-Ti alloy, which is widely used at cryogenic?temperature. In this work, the Ti-5Al-2.5Sn ELI?prealloyed powder was produced by electrode induction melting gas atomization. Characterization of the?prealloyed powder was carried out to understand the following HIPing process. The influence of HIPing?parameters on microstructure and mechanical properties of Ti-5Al-2.5Sn ELI powder compact was studied. The?results show that the relative density of powder compact increases with the increase of HIPing temperature and?pressure. The mechanical properties of powder compact can achieve those of wrought materials, when the relative?density is more than 99.5%. To balance the relative density, microstructure and mechanical properties of the?powder compacts, the optimized HIPing parameters for Ti-5Al-2.5Sn ELI powder are temperature in range of?890~940 ℃, the pressure above 120 MPa and holding for 3 h. The shielding effect of capsule will hinder the?powder densification during HIPing process, which will likely cause non-uniform densification and degrade the?relative density of powder compact. However, the shield effect can be weakened through proper tooling design?and optimization of the HIPing procedure.
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