Microstructure and mechanical behavior of AISI 1018 dual phase steel produced via inter-critical heat treatment
DOI:
https://doi.org/10.30572/2018/KJE/160423Keywords:
Inter-critical heating treatment, AISI 1018 carbon steel, microstructure, hardness, wearAbstract
In the present work, the effect of inter-critical heating temperatures on the micro-structure, microhardness, and wear properties of AISI 1018 steel has been investigated. AISI 1018 steel was heated at three different temperatures 750°C, 775°C, and 800°C inter-critical temperatures for 30 min and followed by hardening in salt water. The results of this study showed that the concentration of martensite phase increases by incrementing inter-critical temperature as 36% Vm. till 70% Vm. At 750°C and 775°C there is one-stage of work hardening has taken place, while two stage have taken place at 800°C. The exponent of work hardening (n) increases with increments of temperature by 0.239 at 750°C, 0.302 at 775°C, and 0.391 at 800°C. While the mechanical properties, such as microhardness, yielding strength, and tension strength have been increased by 162 (HV), 599 MPa and 800 MPa respectively, with an increment of the concentration of the martensite phase till 50%, at which the concentration of the martensite phase is equal to the concentration of the ferrite phase and then slightly increases. Finally, the results of wear behavior reveal that the rate of wear decreases with increasing the temperature of heat treatment by 60×10-7 to 30×10-7, as shown in Fig.9. The photomicrographs of worn surfaces have shown that the grooves of the sample heated at 800°Care finer than for the samples heated at 750°C and 775°C owing to the increase in the concentration of the martensite phase
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