When the material and structure are subjected to the load of repeated changes for many times, although the stress value never exceeds the strength limit of the material, or even lower than the elastic limit, failure may occur, and the failure of the material and structure under the repeated action of alternating load is called metal fatigue failure. But in fact, this phenomenon is not limited to solid metals, many solid materials also have this phenomenon, such as plastics, carbon fiber, ceramics, glass and so on.
gh605Cobalt-based superalloys
Overview of GH605 characteristics and application fields:
The alloy is a cobalt-based superalloy strengthened by 20Cr and 15W solid solution, which has medium durability and creep strength below 815, excellent oxidation resistance below 1090, and satisfactory process performance such as forming and welding. It is suitable for the manufacture of hot-end high-temperature parts such as aero-engine combustion chambers and guide vanes, which require medium strength and excellent high-temperature oxidation resistance. It can also be used on aero engines and space shuttles. It is mainly used in the imported models and is used in the manufacture of high-temperature parts such as guide plates, turbine outer rings, outer walls, vortex devices, and sealing sheets.
GH605 is a similar grade:
L605, HS25, WF-11, ALS1670, UNSR30605 (USA), KC20WN (France), Haynes25
GH605 Chemical Composition: (GB T14992-2005).
GH605 Physical Properties:
GH605 mechanical properties: (at 20 minimum value of mechanical properties).
GH605 Production Implementation Standard:
GH605 Metallographic Structure:
The alloy can be aged to produce carbides and intermetallic compounds, including M7C3, M23C6, M6C, A-CO3W, -CO3W, L-CO2W, and -CO7W6.
GH605 process performance and requirements:
1. The alloy has satisfactory cold and hot forming properties, the hot working temperature range is 1200 980, the forging temperature should be high enough to reduce the grain boundary carbide, and it should be low enough to control the grain size, and the suitable forging temperature is about 1170.
2. The average grain size of the alloy is closely related to the deformation degree of the forging and the final forging temperature.
3. The alloy can be connected by fusion welding, resistance welding and fiber welding.
4. Alloy solution treatment: forgings and forging rods 1230, water cooling.