Strengthening of austenitic steels by aging
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Phase strain hardening with subsequent aging at 600°C is the most effective means of strengthening austenitic Fe−Ni−Ti steels by heat treatment. The following mechanical properties can be obtained: δB=105-120 kg/mm2, δ0.2=90-95 kg/mm2, δ=20–22%, ψ=40–45%.
Austenitic Fe−Ni−Ti steels are strengthened most by aging at temperatures where the solid solution decomposes (550–600°C) with subsequent deformation at the same temperatures: δB=150-170 kg/mm2, δ0.2=115-125 kg/mm2, δ=30–35%, ψ=40–50%.
Metastable austenitic Fe−Ni−Ti steels have a high plasticity after strengthening, since stresses exceeding the yield strength induce the martensitic transformation, causing stress relaxation and increasing the capacity of the steel for plastic deformation.
KeywordsMechanical Property Heat Treatment Solid Solution Plastic Deformation Yield Strength
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