Abstract：In the present work, samples of a newly designed nickel-base powder superalloy were made by using argon atomization (AA) + Selective Laser Melting (SLM) process. The laser power was 315 W and the scanning rate was 750 mm?s-1. The cross-section and longitudinal section structure characteristics were analyzed by SEM. Hot Isostatic Pressing (HIP) at 1200℃/150MPa/4h was then carried out, followed by solid solution and aging treatment. The tensile test was carried out at 650 and 850 ℃, respectively. and the microstructure and fracture morphology were analyzed. The effects of HIP and heat treatment on the structure and properties were investigated. The results show that the powder SLM process has good formability, fewer defects such as cracks and voids. After HIP treatment, the microcracks formed in the SLM sample are healed, the structure and morphology are changed, the grain size is refined, and numerus MC phases are precipitated inside the grain and along the grain boundaries. The tensile properties at the elevated temperatures of the HIPPED alloy have been greatly improved, among which the fracture strength at 850 C is increased by 36%, reaching 912 MPa, and the elongation is increased by 125%. The nickel-based powder superalloy material and the SLM+HIP process are expected to be applied to key load-bearing components with complex shapes at 850 ℃.
收稿日期: 2019-10-31
出版日期: 2020-08-31
通讯作者:
张建庭
E-mail: zjt165@163.com
引用本文:
张建庭. 热等静压对激光选区熔化制备高温合金的影响[J]. , 2020, 27(4): 0-0.
Jian-Ting ZHANG. Effect of Hot Isostatic Pressing on preparation of superalloy by Selective Laser Melting. , 2020, 27(4): 0-0.
2020, Vol. 27 