Effect of B and Zr in Ni-Base Superalloys Fabricated by Metal Injection Molding
Metal Injection Molding(MIM)is a near-net-shape technology that can produce geometrically complex parts in high quantity.However,the microstructure in MIM processed Ni-base superalloys differs from that by conventional fabrication methods.For example,fine powders used in MIM alloys usually lead to high fraction of grain boundaries.The grain boundary strength is important for the mechanical properties of polycrystalline superalloys.Normally,grain boundary cohesion is improved by addition of certain elements that segregate to the grain boundary forming strong atom bonds.B and Zr are known to strengthen superalloy grain boundaries in advanced superalloys.In the present investigation,two powder batches derived from CM247 LC alloy were prepared.B and Zr were increased to 0.1 wt.%in both powders compared with 0.015 wt.%B and Zr in CM247 LC.Sintering behavior,microstructure and mechanical properties of the derived alloys were investigated.The results indicated that B and Zr addition both reduced the sintering temperatures of MIM superalloys.Large and blocky M5B3 borides formed when high B content was added.The tensile properties of as sintered alloys were inferior to the base alloy.High Zr content was found to improve the ductility.The Zr containing alloy was heat treated and the tensile elongation decreased compared with the as sintered alloy.
Superalloys Metal injection molding Microstructures Tensile properties Boron Zirconium
Sheng Naicheng Meyer Andreas Horke Katharina Singer Robert F.
Joint Institute of Advanced Materials and Processes(ZMP),Friedrich-Alexander University of Erlangen- Rolls-Royce Deutschland Ltd.,& Co.,KG,Eschenweg 11,Dahlewitz,15827 Blankenfelde-Mahlow,Germany Joint Institute of Advanced Materials and Processes(ZMP),Friedrich-Alexander University of Erlangen-
国际会议
北京
英文
671-676
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）