Microstructure and mechanical properties of annealed SUS 304H austenitic stainless steel with copper
- Microstructure and mechanical properties of annealed SUS 304H austenitic stainless steel with copper
- Indrani Sen; E. Amankwah; N.S. Kumar; 에릭플러리; K. Oh-ishi; K. Hono; U. Ramamurty
- steel; precipitation; grain growth; mechanical characterization; fatigue
- Issue Date
- Materials science & engineering. A, Structural materials : properties, microstructure and processing
- VOL 528, NO 13-14, 4491-4499
- An experimental investigation into the effect of Cu on the mechanical properties of 0 and 3 wt.% Cu added
SUS 304H austenitic stainless steel upon annealing at 700 ◦C for up to 100 h was conducted. Optical
microscopy reveals grain coarsening in both the alloys upon annealing. Observations by transmission
electron microscopy revealed the precipitation of nanometer-sized spherical Cu particles distributed
within the austenitic grains and the presence of carbides at the dislocations. Both the yield and ultimate
tensile strengths of the alloys were found to remain invariant with annealing. Tensile ductility and the
threshold stress intensity factor range for fatigue crack growth for 3 wt.% Cu added alloy increase with
annealing. These are attributed to the grain coarsening with annealing. In all, the addition of Cu to SUS
304H does not affect the mechanical performance adversely while improving creep resistance.
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