Haynes 188 is a cobalt base special alloy, with unique high temperature strength and oxidation resistance, in the long time exposure in 1400-1600° F still has a full range of motion. Compared with nickel-base alloy, cobalt base alloy has inherent high temperature creep property.
Alloy 188 solid solution enhanced with 14% tungsten element, followed by M6C and M23C6 carbide. Alloy 188 is easy to be processed, both manual and automatic welding are applicable. Welding methods include electron beam, tungsten electrode gas argon arc welding and resistance welding.
Haynes 188 characteristics:
Excellent high temperature strength and environmental tolerance.
188 alloy containing cobalt, nickel, chromium, tungsten, high temperature strength is very good, and under the high temperature of 1095 ° C for a long time, still have very good oxidation resistance, can effectively resist hot corrosion of sulfur deposits. It can be processed by traditional technology or used in casting parts.
Workability
188 alloy has good forming and processing characteristics. It can be forged or heated. Hot working need to the work piece at 1175 ° C for long enough time heat preservation, ensure the work piece to the temperature. Because of the ductility of the material, 188 alloy can be cold-processed. Because the alloy has the characteristics of rapid cold hardening, it needs to be annealed several times in the process of machining complex parts. Both hot and cold machining parts need to be annealed and quickly cooled to restore the properties of the material.
This material has good limitation welding characteristics, can be manually welded, also can be used automatic welding method, including TIG, MIG, electron beam welding, resistance welding.
Heat Treatment
Forged 188 alloy is usually supplied in a solid solution state. Conventional heat treatment method is to 1175 ° C + / - 14 ° C solid solution treatment and rapid cooling or water quenching in order to achieve the best performance. Annealing at a temperature below the solid solution temperature will result in some carbide precipitation, which will affect the performance of 188 alloy.
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