The influence of grain size, in the range of 10 to 180 μm, on creep properties of 304HCu stainless steel (SS) was evaluated at 180 MPa and 923 K. A 30 μm grain size showed a peak in creep life and minimum in steady-state creep rate with low damage potential. Detailed microstructural investigations revealed an increase in the tendency to intergranular fracture at grain sizes above 30 μm, whereas ‘transgranular fracture coupled with isolated intergranular cracks/cavities’ have been observed with decreasing grain size from 30 to 10 μm.
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