(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082)
摘 要:
基于多道次局部小變形累積致整體成型的工藝思路，采用一種新型的楔形壓制工藝，對(duì)大尺寸Al-Fe-V-Si耐熱鋁合金噴射沉積管坯進(jìn)行有效致密化，壓制出尺寸為douter
關(guān)鍵字: 耐熱鋁合金；多層噴射沉積；管坯；楔形壓制；致密化；力學(xué)性能
（College of Materials Science and Engineering, Hunan University, Changsha 410082,China）
Abstract:A new wedge pressing process for compressing large scale porous tubular preforms was adopted based on the idea of accumulating local small deformation as to integral forming. Heat-resistant aluminum alloy tubes of douter 330 mm×dinner 314 mm×78 mm and douter 330 mm×dinner 312 mm×113 mm with well mechanical properties, density and good contour were fabricated. Densification behavior, microstructure and mechanical properties of the spray deposited Al-Fe-V-Si tubes during wedge pressing were investigated. The results show that, with increasing hydrostatic pressure and uniformly distributed temperature, the fragile interfaces and lamellar structure in the as-deposited materials are effectively improved, pores are closed and the mechanical properties are substantially upgraded due to increasing effective loading area after the stainless steel package wedge pressing. The mechanical properties and relative density of the deposits increase from 125 MPa, 0.15% and 82% to 301 MPa, 9.3% and 99.3% respectively after the reduction of 50.4%, indicating that the novel method is feasible, practical and cost-effective.
Key words: heat-resistant aluminum alloy; multi-layer spray deposition; tubular perform; wedge pressing; densification; mechanical properties
