Significant Strengthening Effect on Martensitic Stainless Steel by Repetitive High-Stress Loading at Ultralow Temperature

摘要

The effect of repetitive high-stress loading (RHSL) at ultralow temperature on the microstructure and mechanical properties of S04 martensitic steel was studied. RHSL significantly increases the yield strength of S04 steel from 1220 to 1650 MPa and raises the tension elastic modulus from 170 to 207.5 GPa with small plastic deformation. This most efficient strengthening mechanism involves the evolution of dislocation patterns and the formation of martensite twins. (C) The Minerals, Metals & Materials Society and ASM International 2019