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Effect of Sulfur on the Hot Plasticity of GH625 Superalloy

The influences of sulfur on the hot plasticity of superalloy GH625 were studied. The results indicate that the area reduction rate were 70% between 950°C to 1250°C with the S content below 0.0020%. When the S content is higher than 0.0025%, the area reduction rate was below 50%. The fractography was examined and analyzed by scanning electric microscope (SEM). The SEM results showed that the tensile fracture was cleavage fracture with the S content above 0.0030%. There were dimples in the tensile fracture when the S content was 0.0020% and below. It is indicated that the content of sulfur has great effect on the mechanical properties of GH625. In order to improve the hot plasticity of superalloy GH625, the content of sulfur should be controlled below 20ppm.