GH5188 cobalt-based alloy is a solid solution strengthened superalloy, which contains 14% tungsten element, tungsten element can improve the elastic modulus of GH5188 alloy, and can improve the creep resistance, including chromium and lanthanum, can improve the high temperature oxidation resistance of GH5188 superalloy. Often used in aerospace, petroleum energy, chemical and other fields.
1. Chemical Elements Of UNS R30188 Alloy
| GH5188 | C | Cr | Ni | W | Fe | B | Mn | Si | La | Co |
| Element% | 0.05-0.15 | 20-24 | 20-24 | 13-16 | <3.0 | <0.015 | <1.25 | <0.2 | 0.03-0.12 | other |
2. Heat Treatment Of UNS R30188 Alloy
Solution Treatment:UNS R30188 alloys undergo solution treatment in the temperature range of 1100-1200°C, maintaining the dissolved state of the solid solution by rapid cooling. Solution treatment can improve the ductility and toughness of the alloy.
Aging treatment: After solution treatment, the strength and creep resistance of UNS R30188 alloy can be improved by aging treatment at lower temperature. The aging treatment temperature is usually between 700-900°C, and the time is several hours.
Solution treatment can improve the yield strength and tensile strength, improve the creep resistance, and improve the service life under high temperature continuous work. Optimize grain size to reduce grain boundary corrosion and oxidation.
- Hot rolled sheet: 1170-1190℃, air cooling
- Cold rolled strip and sheet: 1165-1230℃, rapid air cooling
- Bars and forgings: 1170-1190℃, rapid air cooling
3. Characteristics Of UNS R30188 Alloy
UNS R30188 alloy has strong corrosion resistance, which is better than nickel-based alloy. The alloy can maintain excellent performance in corrosive media, and its resistance to spot corrosion and crevice corrosion is very strong, especially in the environment such as inorganic acid, and will not crack due to stress. This is also a feature of UNS R30188 alloy.
