离心喷射沉积距离对TiAl基合金组织的影响

EFFECTS OF SPRAYING DISTANCES ON THE STRUCTURE OF GAMMA TITANIUM ALUMINIDES PREPARED BY CENTRIFUGAL SPRAY DEPOSITION

研究了γＴｉＡｌ基合金经离心喷射沉积成形时不同喷射距离对合金组织的影响。合金经等离子弧熔炼并重熔后，在真空条件下进行离心喷射沉积成形，喷射沉积距离分别为２００、３００、４００和５００ｍｍ。结果表明，经离心喷射沉积后的合金仍存在着孔隙，且随喷射距离的增加，孔隙率增加，孔隙越细密。成形后的组织结构为层片状组织，其形貌。

The effects of spray forming distances during centrifugal spray deposition process on the structure of a gamma titanium aluminide(Ti 48Al 2Mn 2Nb)were investigated.The ingot of alloy was first melted in a plasma melting furnace, and then remelted and spray formed onto the inside of a set of moveable mild steel substrates over different spraying distances from 200 mm to 500 mm respectively, by means of centrifugal spray deposition under vacuum condition. The results showed that there exist pores in the as sprayed alloys, the porosity levels increase as the spray forming distances increasing from 200 mm to 500 mm, and more and finer pores are found with the increasing of spray forming distances; the typical lamellar structure was obtained, but the configuration of alloy is changeable, which is related to the spray forming distances.