Influence of finish rolling temperature on the metallographic structure, mechanical properties and precipitation behavior of the second phase particles was studied by means of optical microscopy, scanning electron microscopy, transmission electron microscopy and other test equipments. The results show that the metallographic structures of high strength steels for container with different finish rolling temperatures are composed of ferrite and a little pearlite and the grain size grades of ferrite are both 13.0. Compared with the one with finish rolling temperature of 890 ℃, the yield strength and tensile strength of the one with finish rolling temperature of 850 ℃ increase by 32 MPa and 26 MPa respectively. The results of theoretical calculation and observation by TEM show that the higher strength of the one with finish rolling temperature of 850 ℃ mainly is due to the higher nucleation rate of second phase particles, more precipitation amount and smaller particle spacing, which makes precipitation strengthening effect more significant.
Key words
finish rolling temperature /
second phase particles /
fine crystalline strengthening /
precipitation strengthening /
nucleation rate
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