Abstract
Martensitic transformation and matching fracture behaviors in lean duplex stainless steel 2101 (LDSS) during tension deformation at low temperature were investigated. The low-temperature tensile tests were conducted using tensile speed of 0.5mm/min at −30°C, −50°C and −70°C. The results indicated that the stress–strain curves of lean duplex stainless steel 2101 at low temperatures show a work hardening and softening mode at different temperatures. The morphology of the strain-induced martensite is lath-like at −30°C, bow-like at −50°C and fold-like at −70°C. The ε-martensite is not observed in the lean duplex stainless steel and the slip planes are high-index crystalline faces. The martensitic transformation mechanism is γ (fcc)→α′(bcc) during the deformation of lean duplex stainless steel. Moreover, the strain-induced martensite improves the tension resistance by either hindering the crack propagation or reducing the crack growth rate. The fractography of matching fracture surfaces shows a mixture of dimple fracture in ferritic phase and austenitic phase.
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