Abstract
Two high strength low alloyed steels with 0.4%C, 0.6%Mn, 2%Si and either 1.3% of chromium or without chromium were used in this work to evaluate the effect of chromium on the final microstructure obtained by thermo-mechanical processing. Various heating temperatures, cooling rates and bainitic hold temperatures were tested. High strengths around 1700 MPa were achieved for the chromium alloyed steel, however total elongation reached only 9%. Chromium-free steel turned out to be better suited for TRIP (transformation induced plasticity) processing. The relatively high strengths around 900 MPa were in this case accompanied by very high total elongations exceeding 30%. The final microstructure of chromium-free steel was also more typical for TRIP steel, as it consisted mainly of the mixture of bainite and polygonal ferrite.
Highlights
TRIP steels are advanced steel grades with high strength and enhanced total elongation and formability
Two high strength low alloyed steels with 0.4%C, 0.6%Mn, 2%Si and either 1.3% of chromium or without chromium were used in this work to evaluate the effect of chromium on the final microstructure obtained by thermo-mechanical processing
Chromium retards pearlite growth rate and refines the microstructure by reducing the growth rate of prior austenite grain in steels [14,15] and improves corrosion resistance [16], which can be convenient for TRIP steels as well
Summary
TRIP (transformation induced plasticity) steels are advanced steel grades with high strength and enhanced total elongation and formability. This should make CMnSiCr steel a better candidate for TRIP steel processing as it should enable creation of polygonal ferrite at relatively low cooling rates, without the risk of obtaining undesirable pearlite in the final microstructure. Coarser microstructures with larger bainitic laths were obtained after the processing with higher soaking temperature of 900 °C and higher cooling rate of 15 °C/s.
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