the martensitic stainless steel was forged and then quenched and tempered. i want reduce the difference in transverse and longitudinal strength of the steel to maximum 7 percent. what are the probable solutions?
was the SS sample plate/sheet shaped? was it directionally rolled or randomly forged? More uniform forging/ rolling at perpendicular directions may reduce strength difference. take into account thermal distribution and heat flux into the specimen during tempering as well. more directional uniformity may do reduce the diffrence.
Dear Milad Vahman,
The steel is already forged, so there is no point in discussing it. Any mechanical working (e.g.- rolling, forging, extrusion, etc.) facilitates the plastic flow of the material in a certain preferential direction, which makes the material anisotropic. At this stage whatever you can do is only by heat treatment. My suggestion is anneal the steel in austenitic region (say 950-1000 deg C) and allow the grains to fully recrystallize (some may show growth also). But you have to optimize the annealing time as it cannot be too prolonged to facilitate undesired carbide precipitation. Then you have to again go through the quenching and tempering treatment. I don't know if the tensile strength will come within 7% variation or not but anisotropy must reduce by this method for sure.
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