(1) The chemical composition and process parameters of steel can be used as the engineering benchmark of 115-5PH precipitation hardening stainless steel for industrial trial production;
(2) After aging, the matrix is lath martensite + a small amount of reverse transformed austenite structure, and a large number of fine Cu-rich phases are precipitated at the same time. The Cu-rich phase is the main strengthening phase in the steel and is the main reason for the increase in strength. ;
(3) The optimal rolling temperature range of 15-5PH steel plate is 900 ~ 1100°C, and the strength of 1” steel with low carbon content after final heat treatment is higher than that of 2” steel and 3” steel, and it has good toughness. plasticity to match;
(4) As the temperature increases during the aging process, the amount and rate of reverse transformed austenite generated in 2* steel and 3" steel with higher carbon content are higher than that of 1* steel, resulting in reverse transformation The amount of austenite is more, which reduces the strength of steel.
