發(fā)布時間：2019-06-25 13:37

【摘要】：利用自主開發(fā)的選區(qū)激光熔化設(shè)備以鈷鉻合金為成型材料,在進(jìn)行了系統(tǒng)的工藝優(yōu)化研究的基礎(chǔ)上,對選區(qū)激光熔化(SLM)制件成型過程中表面粗糙度演化、微觀形貌、致密度以及硬度之間的內(nèi)在聯(lián)系進(jìn)行了研究。研究發(fā)現(xiàn):成型過程中粉層的熔化收縮以及厚度的累積是造成成型質(zhì)量變差的重要原因;較小的表面粗糙度累積效應(yīng),可大大減少成型件內(nèi)部的孔隙數(shù)量從而提高致密度,粉層厚度的降低是減小表面粗糙度累積效應(yīng)和提高致密度的關(guān)鍵;制件的宏觀硬度比顯微硬度對制件致密度存在更顯著的依賴關(guān)系:致密度越大,宏觀硬度越大。通過優(yōu)化工藝制得的工件致密度達(dá)到98.04%,宏觀硬度為40HRC,符合美國材料實(shí)驗(yàn)協(xié)會(ASTM)標(biāo)準(zhǔn)。
[Abstract]:Using selective laser melting equipment developed by ourselves, cobalt-chromium alloy was used as molding material. On the basis of systematic process optimization research, the internal relationship among surface roughness evolution, micromorphology, density and hardness in the process of selective laser melting (SLM) parts was studied. It is found that the melting shrinkage and thickness accumulation of powder layer are the important reasons for the deterioration of molding quality, and the small cumulative effect of surface roughness can greatly reduce the number of pores in the molding parts and increase the density, and the decrease of powder layer thickness is the key to reduce the cumulative effect of surface roughness and increase the density. The macro hardness of the parts depends more significantly on the density of the parts than the microhardness: the higher the density is, the greater the macro hardness is. The density of the workpiece prepared by the optimized process is 98.04%, and the macro hardness is 40HRC, which accords with the (ASTM) standard of the American Materials experiment Association.
【作者單位】： 北京工業(yè)大學(xué)激光工程研究院;
【基金】：北京市科委重大課題(Z141100002814011)
【分類號】：TG665

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本文編號：2505722