Browsing by Subject "precipitation hardened stainless steel"

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    EFFECT OF HEAT TREATMENTS ON THE TENSILE PROPERTIES OF ADDITIVELY MANUFACTURED 15-5 PH STAINLESS STEEL
    (University of Texas at Austin, 2023) Gusain, Rukesh; Gradl, Paul R.; Shao, Shuai; Shamsaei, Nima
    This study investigated the effect of post-manufacture heat treatments on the microstructure and mechanical properties of 15-5 PH stainless steel (SS) fabricated by laser powder-directed energy deposition (LPDED). Various heat treatment procedures (CA-H900 and CA-H1150) were conducted to evaluate their effects on the tensile behavior of LP-DED 15-5 PH SS. Scanning electron microscopy was used to characterize the microstructural features and the fracture surfaces. Tensile tests were performed to evaluate the mechanical properties at cryogenic and room temperatures. The mechanical behavior of the LP-DED 15-5 PH SS in different heat treatment conditions is discussed based on their microstructures and fracture surfaces. Reduction in area of CA-H1150 treated specimens after tensile tests was significantly higher than CA-H900 ones, while the ultimate tensile and yield strengths of CA-H900 specimens were higher compared to the CA-H1150 ones. The CA-H1150 specimens had relatively coarser Cu-enriched precipitates, and exhibited greater necking compared to CA-H900 specimens.