Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 6

Effects of Nb, Ti and V on recrystallization kinetics of austenite in HSLA steels

10.15199/28.2016.6.2

Marek Opiela

nr katalogowy: 103152
10.15199/28.2016.6.2

The work presents research results of impact of Nb, Ti and V microadditions on recrystallization kinetics and microstructure of newly elaborated steels assigned for production of forged machine parts, using the method of thermomechanical treatment. The study was performed with the use of Gleeble 3800 simulator. In order to determine recrystallization kinetics of plastically deformed austenite, discontinuous compression tests of specimens were done with a given strain at the rate of 10 s-1, in a temperature range from 900 to 1100°C, with isothermal holding of samples between successive stages of deformation for 2 to 100 s. Recrystallization kinetics of plastically deformed austenite was described using the Johnson-Mehl-Avrami equation. Performed two-stages compression tests revealed that microadditions introduced into steel considerably influence the kinetics of static recrystallization. Determined time of total recrystallization of austenite, tR, in a temperature range from 1100°C to 900°C changes from 100 to 600 s and from 300 to 800 s — for the Ti-V steel and Ti-Nb-V steel, respectively. Executed hot compression tests will contribute to establishing conditions of forging with the method of thermomechanical treatment. Key words: HSLA steels, thermomechanical treatment, static recrystallization.1. INTRODUCTION HSLA-type (High Strength Low Alloy) microalloyed steels — containing up to 0.3% C and 2% Mn and microadditions with high chemical affinity to N and C, i.e. Nb, Ti and V in the amount of about 0.1%, and sometimes also slightly increased concentration of N and up to 0.005% of B, increasing hardenability — are particularly useful for production of forged parts with fine-grained microstructure using the method of thermomechanical processing. The interaction of microadditions in steel in a solid state depends on their state under conditions of performed plastic working. Microadditions dissolved in a solid solution rais[...]

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