Effects of Copper Addition on Mechanical Properties of 0.15C-1.5Mn-1.5Si TRIP-aided Multiphase Cold-rolled Steel Sheets.

Effects of Tramp Elements on Formability of Low-carbon TRIP-aided Multiphase Cold-rolled Steel Sheets

“…11,13) Also, recent studies presented enhanced mechanical properties by Cu addition to TRIP-aided steels. 11,[14][15][16] It was also confirmed that the containment of tramp elements Cu, Cr, and Ni in TRIP-aided cold-rolled steel sheets could work favorably for the enhancement of mechanical properties. 15) Despite the generally accepted knowledge of excellent mechanical properties of TRIPaided steels, TRIP-aided cold-rolled steel sheets in particular, studies on the formability are yet to come.…”

“…The heat-treated cold-rolled steel sheets were first etched in a 4 % nital solution, etched again in a sodium metabisulfite solution (Na 2 S 2 O 3 · H 2 O 10 gϩH 2 O 100 mL), 14) and observed by an optical microscope. Room-temperature tensile tests were conducted on plate-type specimens (longitudinal direction) with a gage length of 25 mm and a gage width of 6.3 mm at a crosshead speed of 2.5 mm/min.…”

“…When the specimens are etched by a sodium metabisulfite solution, it is easier to define the phases since ferrite is displayed as gray, bainite or martensite as black, while retained austenite as white. 14) In all the steels, most retained austenites are connected with adjacent ferrites, bainites, or martensites, while some are isolated in ferrite grains. There are some film-type retained austenites located in bainite or martensite lath boundaries, although they are not easily identified in Figs.…”

Toward Unraveling the Importance of Deformed Microstructure before TRIP Heat Treatment in Transformation-Induced Plasticity Steels

“…The studied steel has a high amount of Cu as an alloying element. Therefore, the precipitation hardening effects might be of concern . Figure shows the change in hardness of the Recrystallization‐Annealed Sheet during soaking at 480 °C (∼900 °F), which is the usual aging temperature for precipitation hardening of copper‐containing steels .…”

Effect of Cold Rolling on Annealing Behavior and Retained Austenite Characteristics of Multiphase CMnSi Steel

“…Many researches have been performed to identify the effect of some mentioned parameters on retained austenite characteristics and resulted properties of the product. 4,[14][15][16][17][18][19][20][21][22][23] Although, Kim et al [18][19][20] and Lee et al 4,[15][16][17] have conducted many experiments on the effect of heat treatment and alloying elements, however, they have not discussed about the initial cold rolling conditions. Srivastava et al 22) focused on retained austenite feature and its effect on formability and mechanical properties which are obtained at different annealing and austempering times.…”