High Temperature Tensile Deformation Behavior of Haynes230 Nickel Base Superalloy

Tensile experiments were conducted at different temperatures for the Haynes230 nickel-based alloy, and the microscopic mechanism of the tensile deformation behavior at high temperatures was investigated using electron backscattered diffraction (EBSD) technique. It is shown that Haynes materials have a high resistance to plastic deformation until 800 degrees C. At 650 degrees C, the materials show a significant dynamic strain aging (DSA) phenomenon, and the DSA effect is similar at 700 and 800 degrees C, and the DSA effect is weakest at 760 degrees C. The strengthening effect of DSA effect makes the alloy still maintain high strength at 650 degrees C, and the tensile strength at 800 degrees C does not decrease much compared with that at 760 degrees C. The EBSD results show that a large number of deformed twins appear near the fracture at room temperature, and the grain orientation is dominated by <111>; the <111> orientation of the tissue near the fracture is more obvious at 650 degrees C, and the grain boundaries are bent and deformed, which increases the resistance to dislocation movement; with the increase of temperature, dynamic recrystallization grains appear in the intergranular and intracrystalline areas near the fracture.

Automated summary

Tensile experiments on the Haynes230 nickel-based alloy were conducted at different temperatures, and the microscopic mechanism of the alloy's tensile deformation behavior at high temperatures was investigated using electron backscattered diffraction (EBSD) technique. The results showed that the alloy has high resistance to plastic deformation up to 800 degrees C. At 650 degrees C, a significant dynamic strain aging (DSA) phenomenon was observed, with similar DSA effects at 700 and 800 degrees C, and the weakest DSA effect at 760 degrees C. The strengthening effect of DSA allows the alloy to maintain high strength at 650 degrees C, and the tensile strength at 800 degrees C does not decrease much compared to that at 760 degrees C. EBSD results revealed that deformed twins appeared near the fracture at room temperature, with <111> grain orientation dominating. At 650 degrees C, the <111> orientation near the fracture became more pronounced, with bent and deformed grain boundaries increasing resistance to dislocation movement. With increasing temperature, dynamic recrystallization grains appeared near the fracture in the intergranular and intracrystalline areas.