發(fā)布時(shí)間：2018-04-25 18:53

  本文選題：激光技術(shù) + 激光選區(qū)熔化�。� 參考：《中國激光》2017年09期

【摘要】：研究了退火、兩相區(qū)固溶、固溶時(shí)效三種熱處理方法對激光選區(qū)熔化(SLM)技術(shù)成形TC4鈦合金微觀組織和力學(xué)性能的影響。結(jié)果表明,在SLM成形TC4鈦合金中形成了細(xì)針狀馬氏體組織,幾乎不存在β相,強(qiáng)度較高,塑性較差;經(jīng)過840℃/2h/空冷(AC)退火處理后,TC4鈦合金的顯微組織由(α+β)相構(gòu)成,具有較高的強(qiáng)度和塑性;經(jīng)過940℃/1h/水淬(WQ)固溶處理后,β相的含量增加,晶粒長大,形成交錯(cuò)的(α+β)網(wǎng)籃組織,強(qiáng)度明顯下降,塑性提高;經(jīng)過940℃/1h/WQ+540℃/4h/AC固溶時(shí)效處理后,形成了均勻彌散的(α+β)相,α相粗化,強(qiáng)度降低,塑性小幅提高。TC4鈦合金經(jīng)過熱處理后,內(nèi)部殘余應(yīng)力減小,變形開裂傾向降低。采用840℃/2h/AC退火處理工藝,可使SLM成形TC4鈦合金獲得較佳的強(qiáng)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 (偽 尾) after annealing at 840 鈩，

本文編號：1802531