Abstract
If TRIP steel with excellent mechanical properties dominated by strain induced martensitic transformation (SIMT) is applied to a shock absorber in automobiles, it is required that improve its reliability by a clarification of the mechanical properties. Thus, it is necessary to evaluate SIMT and then the correlation between SIMT and mechanical properties of TRIP steels must be examined. In the previous report, SIMT in cylindrical specimens made of SUS304 is evaluated by a measurement of relative magnetic permeability under quasi-static tensile tests. However, because of only restricted conditions, obtained relative magnetic permeability may change by factors except STMT. Therefore, it is necessary to measure its rate sensitivity on only different conditions of SIMT for further confirmation of the validity on this method. Here, martensitic volume fraction is evaluated by measuring the relative magnetic permeability in sheet specimens made of both SUS304 and SUS301 during quasi-static tensile test at various strain rates.
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