本文選題：脈沖電流 + 激光��； 參考：《機(jī)械工程學(xué)報(bào)》2017年20期

【摘要】：分別借鑒脈沖電流對(duì)深層裂紋愈合效果良好及激光對(duì)淺層裂紋愈合效果明顯的優(yōu)勢(shì),用脈沖電流及激光對(duì)鈦合金中的深層裂紋進(jìn)行復(fù)合處理。脈沖電流處理過(guò)程中,繞流效應(yīng)使得裂尖處產(chǎn)生了較高的溫升并形成了局部壓應(yīng)力。脈沖電流處理結(jié)束后,深層裂紋中出現(xiàn)了部分愈合區(qū)域,電子探針檢測(cè)顯示愈合區(qū)內(nèi)元素分布均勻,電子背散射衍射檢測(cè)顯示愈合區(qū)內(nèi)主要為細(xì)小的針狀馬氏體。經(jīng)過(guò)脈沖電流與激光復(fù)合處理后,鈦合金中深層裂紋愈合效果明顯。激光重熔使得上部裂紋愈合良好并形成了重熔區(qū)-熱影響區(qū)-基體的結(jié)構(gòu)。在距離重熔區(qū)較近位置處,由脈沖電流形成的愈合區(qū)呈現(xiàn)出明顯的柱狀晶結(jié)構(gòu)。
[Abstract]:Using the advantages of pulse current for deep crack healing and laser for shallow crack healing, the deep crack in titanium alloy was treated with pulse current and laser. In the process of pulse current treatment, the temperature rise at the crack tip is higher and the local compressive stress is formed due to the flow around the crack tip. At the end of pulse current treatment, partial healing zone appeared in the deep crack. Electron microprobe (EPMA) showed that the elements in the healing zone were uniform, and the electron backscatter diffraction (EBSD) showed that the healing zone was mainly acicular martensite. After pulse current and laser treatment, the deep crack healing effect of titanium alloy is obvious. Laser remelting makes the upper crack heal well and forms the structure of remelting zone, heat affected zone and matrix. Close to the remelting zone, the healing zone formed by pulse current shows a columnar crystal structure.
【作者單位】： 大連理工大學(xué)機(jī)械工程與材料能源學(xué)部;沈陽(yáng)鼓風(fēng)機(jī)集團(tuán)股份有限公司研究院;大連理工大學(xué)遼寧省凝固控制與數(shù)字化制備技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃,2011CB013402) 遼寧省自然科學(xué)基金(2014028002) 遼寧省科技創(chuàng)新重大專項(xiàng)(201303002) 遼寧重大裝備制造協(xié)同創(chuàng)新中心 沈鼓-大工重大科研發(fā)展基金 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目
【分類號(hào)】：TG146.23;TG66
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本文編號(hào)：1983388