激光选区熔化成形TC4钛合金热处理后微观组织和力学性能

发布时间：2018-04-25 18:53

  本文选题：激光技术 + 激光选区熔化　； 参考：《中国激光》2017年09期

【摘要】：研究了退火、两相区固溶、固溶时效三种热处理方法对激光选区熔化(SLM)技术成形TC4钛合金微观组织和力学性能的影响。结果表明,在SLM成形TC4钛合金中形成了细针状马氏体组织,几乎不存在β相,强度较高,塑性较差;经过840℃/2h/空冷(AC)退火处理后,TC4钛合金的显微组织由(α+β)相构成,具有较高的强度和塑性;经过940℃/1h/水淬(WQ)固溶处理后,β相的含量增加,晶粒长大,形成交错的(α+β)网篮组织,强度明显下降,塑性提高;经过940℃/1h/WQ+540℃/4h/AC固溶时效处理后,形成了均匀弥散的(α+β)相,α相粗化,强度降低,塑性小幅提高。TC4钛合金经过热处理后,内部残余应力减小,变形开裂倾向降低。采用840℃/2h/AC退火处理工艺,可使SLM成形TC4钛合金获得较佳的强度/塑性匹配。
[Abstract]:The effects of annealing, two-phase solid solution and solid solution aging on the microstructure and mechanical properties of TC4 titanium alloy fabricated by laser selective melting (SLM) technique were investigated. The results show that fine acicular martensite is formed in TC4 titanium alloy formed by SLM, there is almost no 尾 phase, the strength is high, the plasticity is poor, and the microstructure of TC4 titanium alloy is composed of (伪 尾) after annealing at 840 鈩，

本文编号：1802531