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Effect of a Phase Formation on Mechanical Properties of Stainless Steel SUS309L after Isothermal Aging

The effect of σ phase formation on mechanical properties, such as the tensile strength, hardness and reduction of area, of SUS 309L stainless steels with various Si content after isothermal aging was investigated. The experiments were performed using tensile and Rockwell hardness tests and scanning electron microscopy. The tensile strength of SUS 309L stainless steels with 0.17, 0.34 and 0.73 wt% Si content increased with increasing aging time from 0 to 200 h. The hardness also increased after the same aging parameters. However, the reduction of area of these materials with different Si content decreased significantly.