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Vol.38, No.3, 447 ~ 454, 2000
Title
Pesearch Paper / Mechanical Behavior : Effect of Cu on Formability of Low Carbon TRIP - Aided High Strength Cold - Rolled Steel Sheets
임동빈Dong Bin Im,이창길Chang Gil Lee,김성준Sung Joon Kim,박익민Ik Min Park
Abstract
The main emphasis of the present study has been placed on understanding the effect of Cu on the formability of TRIP-aided cold-rolled steel sheets. Two kinds of 0.15C-1.5Si-1.5Mn (ECO-0) and 0.15C-1.5Si-1.5Mn-0.5Cu (ECO-Cu) cold-rolled steel sheets were prepared. These steel sheets were intercritically annealed at 790-800℃, and isothermally treated at 430℃. Tensile tests and limiting dome height (LDH) tests were conducted, and the changes of retained austenite volume fractions as a function of tensile strain were measured using X-ray diffraction. The ECO-Cu steel sheet had higher volume fraction of retained austenite about 15%, and smaller size of ferrite grains and retained austenite particles than the ECO-0 steel sheet. On the other hand, the stability of retained austenite of the two steel sheets were the same. The tensile properties and the formability of the ECO-Cu steel sheet was superior to the ECO-0 steel sheet, due to high strain hardening rate maintained in the high strain region by the strain induced transformation of retained austenite to martensite. Containing Cu as a tramp element in the TRIP-aided controlled steel sheets showed beneficial effects on the mechanical properties and formability.
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