Abstract:
본 발명은 단결정 초합금, 특히 10중량% 또는 그 이상의 내화 금속(refractory metal)을 함유하는 단결정 니켈계 초합금으로 형성된 부재(12, 14)의 용접 방법에 관한 것이다. 심(shim)(24)은 부재(12, 14) 사이에 위치되고, 지지 스트립(backing strip)(16)은 부재(12, 14) 양자에 접촉하고, 부재(12, 14) 사이의 갭을 가교(bridging)하도록 바람직하게 위치된다. 그 후, 부재(12, 14)는 낮은 전류 펄스 주파수 및 낮은 이동 속도를 갖는 고 에너지 빔(38)을 사용해 서로 용접된다.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for preparing an iridium tip with atomic sharpness. SOLUTION: The method includes steps of tapering an iridium wire to a needle shape and heating the iridium needle in an oxygen atmosphere. Also an iridium needle is provided which has a pyramidal structure which terminates with a small number of atoms. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PURPOSE: A welding method by using a high-energy beam is provided to prevent crack by reducing fatigue during deformation at high temperature, and to minimize distortion and simplify the process for forming the superalloy joint portion by using the high-energy beam. CONSTITUTION: A method of welding members(12,14) formed of single-crystal superalloy is provided, and the members are particularly formed of single-crystal nickel-base superalloy containing 10 weight percent or more of refractory metal. A shim(24) is positioned between the members, and a backing strip(16) is preferably positioned to contact both members and bridge the gap between the members. The members are then welded together by using a high-energy beam(38) with a low current pulse frequency, i.e. about 10 to 50Hz, and low travel speed, i.e. about 0.85 to about 1.5cm/s. The members are welded by using the high-energy beam with voltage of about 100 kV to 150 kV and current of about 10 mA to 40 mA, and the superalloy is mixed by melting the contact portions of the members to form the welded joint portion by cooling.
Abstract:
PROBLEM TO BE SOLVED: To develop single crystal nickel-base superalloys that exhibit excellent high temperature creep resistance, while reducing or eliminating the need for rhenium additions, and while retaining other desirable properties such as good castability and phase stability.SOLUTION: A rhenium-free nickel-base superalloy for single crystal casting that exhibits excellent high temperature creep resistance, while also exhibiting other desirable properties for such alloys, comprises 5.60 to 5.85% aluminum, 9.4 to 9.9% cobalt, 5.0 to 6.0% chromium, 0.08 0.35% hafnium, 0.50 to 0.70% molybdenum, 8.0 to 9.0% tantalum, 0.60 to 0.90% titanium, 8.5 to 9.8% tungsten, the balance comprising nickel and minor amounts of incidental elements.