Mechanical Properties and Microstructure Characteristics of Laser Rapid Forming Rene88DT Superalloy
Nickel-based superalloy Rene88DT, has been deposited using laser rapid forming (LRF) route. The mechanical properties and microstructure characteristics of LRF Rene88DT at 25C and 750C were evaluated. The results show that both strength and ductility of LRF Rene88DT can be improved significantly by the integration of optimized heat treatment (solution treatment (1160C, 2h/AC) + aging (760C, 8h/AC)) and the HIP treatment(1160C, 2h/200MPa). The 25C tensile properties are comparable to those of the Powder Metallurgy standard. The 750C tensile strength and ductility are also comparable to those of the Powder Metallurgy standard, but the yield strength is still a little lower at 750C. As compared with the as-deposited state, g precipitates of LRF Rene88DT are evolved gradually to be spherical in shape and uniformly distributes in the g matrix after optimized heat treatment and HIP treatment. Fracture surface shows that crack initiates at the edge for all the samples of LRF Rene88DT after tensile deformation. The deformation is found to be homogeneous in the whole sample. Necking phenomenon exsits near the fracture surface, which corresponds with the superior strength and ductility of LRF Rene88DT.
laser rapid forming rene88dt mechanical properties microstructure characteristics
X.M.Zhao S.L.Gong X.Lin J.Chen W.D.Huang
Science and Technology on Power Beam Processes Laboratory Avic Beijing Aeronautical Manufacturing Te State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian P.R.C
国际会议
北京
英文
340-344
2010-10-25（万方平台首次上网日期，不代表论文的发表时间）