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Modeling of the Kinetics of Strain-Induced Martensite Transformation and the Transformation-Induced Plasticity Effect in a Lean-Alloyed Metastable Austenitic Stainless Steel

Steel Research International, ISSN: 1869-344X, Vol: 93, Issue: 5
2022
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This article investigates the influence of temperature and strain on second-phase transformation strengthening and the resulting mechanical properties in a lean AISI 301LN austenitic stainless steel within a temperature range of −60 to 180 °C. The volume fraction of martensite evolved is determined using nondestructive magnetic Ferritescope measurements that are adjusted by using a calibration factor of 1.7, which is established using the saturation magnetization measurements, X-ray, and neutron diffraction measurements. The kinetics of strain-induced martensite transformation (SIMT) as a function of strain and temperature is accurately described by a set of modified constitutive Boltzmann sigmoidal equations at temperatures below 75 °C. For this steel, the M (30/50) temperature is determined as 61 °C. The absolute M temperature is established as ≈109 °C, and no athermal transformation to martensite is observed upon cooling to −270 °C using cryogenic neutron diffraction facilities. Extended JMAK analysis of the transformation is used to shed light on the mechanism of martensitic transformation. It is found that the transformation-induced plasticity (TRIP) effect due to SIMT is at a maximum at 75 °C, which is the maximum elongation temperature (MET) and calculations are performed regarding alloy development which will reduce the MET to room temperature.

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