국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Grain Boundary Engineering the Mechanical Properties of Allvac 718Plus(Trademark) Superalloy
저자	Gabb, Timothy P.;; Telesman, Jack;; Garg, Anita;; Lin, Peter;; Provenzano, virgil;; Heard, Robert;; Miller, Herbert M.
Keyword	GRAIN BOUNDARIES;; HEAT RESISTANT ALLOYS;; HIGH TEMPERATURE;; MECHANICAL PROPERTIES;; MICROSTRUCTURE;; OXIDATION RESISTANCE;; TENSILE STRESS;; WROUGHT ALLOYS
URL	http://hdl.handle.net/2060/20110003113
보고서번호	NASA/TM-2010-216935
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Grain Boundary Engineering can enhance the population of structurally-ordered "low S" Coincidence Site Lattice (CSL) grain boundaries in the microstructure. In some alloys, these "special" grain boundaries have been reported to improve overall resistance to corrosion, oxidation, and creep resistance. Such improvements could be quite beneficial for superalloys, especially in conditions which encourage damage and cracking at grain boundaries. Therefore, the effects of GBE processing on high-temperature mechanical properties of the cast and wrought superalloy Allvac 718Plus (Allvac ATI) were screened. Bar sections were subjected to varied GBE processing, and then consistently heat treated, machined, and tested at 650 C. Creep, tensile stress relaxation, and dwell fatigue crack growth tests were performed. The influences of GBE processing on microstructure, mechanical properties, and associated failure modes are discussed.