分層厚度對激光選區(qū)熔化成形Ti-5Al-2.5Sn組織與性能的影響規(guī)律

分層厚度對激光選區(qū)熔化成形Ti-5Al-2.5Sn組織與性能的影響規(guī)律Influence of Layer Thickness on Microstructure and Mechanical Properties of Selective Laser Melted Ti-5Al-2.5Sn Alloy

研究了分層厚度對激光選區(qū)熔化（SLM）技術(shù)成形Ti-5Al-2.5Sn（TA7）鈦合金試樣致密度、顯微組織和力學(xué)性能的影響規(guī)律。結(jié)果表明：在激光功率和掃描間距一定的條件下，當(dāng)分層厚度≤40 μm時，致密度隨激光體能量密度的下降不斷提高；當(dāng)分層厚度＞40 μm時，致密度則隨激光體能量密度的下降先升高后降低。隨分層厚度的增大和掃描速率的降低，SLM成形過程中的冷卻速率逐步下降，當(dāng)冷卻速率低于6.8×107 K/s時，顯微組織將由針狀馬氏體α′逐漸向島狀αm轉(zhuǎn)變。通過優(yōu)化工藝參數(shù)，在所有分層厚度（20 μm～60 μm）下均能成形致密的TA7試樣，其顯微硬度、屈服強(qiáng)度和斷裂強(qiáng)度亦可超越鑄件和鍛件；且當(dāng)分層厚度≤40 μm時，韌塑性亦可超越鑄件，并達(dá)到鍛件水平。最終，本文成功探索出能夠兼顧TA7樣品成形效率、冶金質(zhì)量及力學(xué)性能的優(yōu)選分層厚度及SLM工藝參數(shù)組合。

As an additive manufacturing technology, selective laser melting (SLM) process can solve the manufacturing difficulty of Ti-5Al-2.5Sn (TA7) easily. But the low building efficiency of SLM retards its wide applications in aviation, petrochemical and other fields. In order to solve the above problem, the influence of layer thickness on relative density, microstructure and mechanical properties of SLMed TA7 samples were studied in this work. The results show that when the laser power and hatching space are constant, the relative density gradually increases with the decrease of the laser volume energy density under the layer thicknesses less than or equal to 40 μm, whereas first increases and then declines with the decrease of the laser volume energy density under the layer thicknesses larger than 40 μm. At the same time, with the increase of layer thickness and the decrease of scanning velocity, the cooling rate gradually decreases during the SLM processing, when the cooling rate is lower than 6.8×107 K/s, the microstructure will gradually transform from acicular martensite α' to massive αm. Through the optimization of SLM parameters, the dense TA7 bulk specimens with higher microhardnesses, yield strengths and ultimate strengths in comparison to the as-cast and deformed TA7 alloys can be obtained under all layer thicknesses (20 μm~60 μm). While when the layer thicknesses are not larger than 40μm, the ductility of the SLMed TA7 is also superior to that of the as-cast TA7 and comparable to that of the deformed TA7. Finally, the optimal layer thickness and combination of SLM process parameters are successfully determined to balance the building efficiency, metallurgical quality and mechanical properties of the TA7 alloy parts.

全文下載：https://pan.baidu.com/s/1skPgB9N?

作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，通項公司擁有完善的服務(wù)體系和專業(yè)的團(tuán)隊。在同客戶交易的過程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對當(dāng)前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。

TXCO has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. TXCO develops the best alloy material solutions for current and future challenges.

獲取更多我們供應(yīng)的產(chǎn)品和服務(wù)信息，請致電086-021-6786 0205或發(fā)電子郵件service@sinoav.com聯(lián)系我們，您也可以通過微信，微博，領(lǐng)英，臉書，推特和谷歌+與我們互動。

For more information on the products and services that we supply, call us at 086-021-6786 0205 or email us at service@sinoav.com. You can also get in touch on social media, we are constantly active on Weixin, Weibo, LinkedIn, Facebook, Twitter and Google+.