本文選題：選擇性激光熔覆 + TiAlV合金��； 參考：《Transactions of Nonferrous Metals Society of China》2017年05期

【摘要】：為提高合金的力學(xué)性能,在溫度950°C不同應(yīng)變和應(yīng)變速率條件下對SLM成形的Ti6Al4V合金試樣進(jìn)行精密鍛造處理,使用光學(xué)顯微鏡和X射線衍射儀分析原試樣和鍛造處理試樣在水平和豎直截面內(nèi)顯微組織的演化,并計(jì)算了每個截面的孔隙率。結(jié)果表明,大應(yīng)變速率以及大變形量可以改善顯微組織并降低孔隙率,進(jìn)而提高材料的疲勞性能。精密鍛造處理后的試樣顯微硬度小于SLM成形原件的顯微硬度;同時,精密鍛造處理試樣在水平截面和豎直截面的顯微硬度差小于SLM成形原件在兩個截面的顯微硬度差。這說明精密鍛造工藝可以改善SLM成形零件的各向異性。
[Abstract]:In order to improve the mechanical properties of the SLM alloy, precision forging treatment was carried out on the Ti6Al4V alloy specimen formed by SLM at different strain and strain rates at 950 擄C. The microstructure evolution of the original and forged specimens in horizontal and vertical sections was analyzed by optical microscope and X-ray diffractometer, and the porosity of each section was calculated. The results show that high strain rate and large amount of deformation can improve the microstructure and decrease the porosity, thus improving the fatigue properties of the materials. The microhardness of the specimen after precision forging is smaller than that of the original SLM, and the microhardness difference between the horizontal section and the vertical section of the precision forging sample is smaller than that of the original part of SLM forming at the two sections. This shows that precision forging process can improve the anisotropy of SLM forming parts.
【作者單位】： 西安交通大學(xué)機(jī)械工程學(xué)院;
【基金】：Project(50975222)supported by the National Natural Science Foundation of China Project(2014ko8-34)supported by the Industrial Research Project of Shaanxi Province,China
【分類號】：TG146.23;TG319;TG665

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