Abstract
1. The effect of initial deformation on the structural and mechanical properties of aged 1Kh18N9 steel was investigated under conditions involving development of martensitic transformation. It was established that initial tensile stress up to the maximum value of uniform residual deformation (e1=35%) leads to an increase in the elastic limit of aged steel for constant values (e1=20%) of the ultimate strength and characteristic ductility. The structural details of the strengthening process were determined. 2. It is shown that the degree of austenite work-hardening increases, the aging process is accelerated, the quantity of martensite formed in subsequent tests of aged steel increases, and its strength is decreased as initial deformation is increased. 3. Increase in the elastic limit of aged steel with increase in initial deformation is associated with an increase in the number of irreversible defects (grain boundaries, slip dislocation planes, and others) and precipitation of dispersed (Fe, Cr)23C6 carbide particles on them. The stressed austenitic state and martensite deformation also significantly affect the ultimate strength of aged steel.
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