The Precipitation Processes and Mechanical Properties of Aged Inconel 718 Alloy After Annealing

Archives of Metallurgy and Materials

Gancarczyk T.¹  Pieja T.¹  Dudek S.¹  Sieniawski J.²  Adamczyk-Cieslak B.³  Mizera J.³  Maj P.³  Slesik M.³ 

[1] PRATT & WHITNEY RZESZÓW S.A., HETMAŃSKA 120 35-078 RZESZOW, POLAND;RZESZÓW UNIVERSITY OF TECHNOLOGY, DEPARTMENT OF MATERIALS SCIENCE, 2 WINCENTEGO POLA STR.35-959 RZESZOW, POLAND;WARSAW UNIVERSITY OF TECHNOLOGY, FACULTY OF MATERIALS SCIENCE AND ENGINEERING, 141 WOŁOSKA STR., 02-507 WARSAW, POLAND;

关键词: Inconel 718;    mechanical properties;    precipitations;    heat treatment;   

DOI  :  10.1515/amm-2017-0259

来源: DOAJ

【 摘 要 】

Inconel 718 is a precipitation hardenable nickel-iron based superalloy. It has exceptionally high strength and ductility compared to other metallic materials. This is due to intense precipitation of the γ’ and γ” strengthening phases in the temperature range 650-850°C. The main purpose of the authors was to analyze the aging process in Inconel 718 obtained in accordance with AMS 5596, and its effect on the mechanical properties. Tensile and hardness tests were used to evaluate the mechanical properties, in the initial aging process and after reheating, as a function of temperature and time respectively in the ranges 650°-900°C and 5-480 min. In addition, to link the mechanical properties with the microstructure transmission microscopy observations were carried out in selected specimens. As a result, factors influencing the microstructure changes at various stages of strengthening were observed. The authors found that the γ’’ phase nucleates mostly homogenously in the temperature range 650-750°C, causing the greatest increase in strength. On the other hand, the γ’ and δ phases are formed heterogeneously at 850°C or after longer annealing in 800°C, which may weaken the material.

【 授权许可】

Unknown