Advanced High Strength Steels classification [16].

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... the complex microstructure and chemical composition, advanced high strength steels (AHSS) have many families as shown in Figure 3. Dual Phase (DP), complex phase (CP), transformation-induced plasticity (TRIP), martensitic (MART) and high-strength low-alloy (HSLA) steels are the main groups of commercial steels because of their useful mechanical properties. ...

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... the challenge of materials science is to improve the mechanical properties of steels in order to obtain a 3 rd generation of these steels [16]. That means, the researchers are trying to increase the elongation of AHSSs without decreasing its tensile strength as shown in Figure 3. Similarly, the main objective of this project is to find a method which can improve the mechanical properties of AHSSs into that of the 3 rd generation. ...

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... leads to increase in the hardness, where the microhardness at 175 °C is higher than the microhardness at 165 °C. Figure 30 shows that the water quenched steel has the highest microhardness, with an average of 357 HV1. Surprisingly, the second hardest steel is the as-received Strenx 700MC with an average of 269 HV1. ...

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... is due to their ferritic microstructure present in air-cooled, furnace-cooled, and double normalized samples [49]. On the other hand, Intercritical Heat Treated steels, shown in Figure 30, have the same average hardness, with low deviation. There is a difference in the temperature between IHT1-IHT3, and that might be the cause for the variation of hardness, but even if that is the case, the variation is minimal. ...

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... ± 17 703 ± 9 13 ± 0.2 Figure 33 shows the rest of the results of Quenched and Partitioned High Aluminum Steel (the samples QP4, QP6, QP7 and QP8). On one hand, QP4, QP6, QP7 and QP8 have good combination of ductility and strengths as shown in Table 9. ...

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... tensile tests were performed for each different tempering condition of High Aluminum Steels. The stress-strain for the best curves are plotted in Figure 34. The three values have been averaged in order to get the numerical result shown in Table 11. ...

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... the Austempering process, three sets of conditions were tested with three samples in each. This was then compared to the as-received High Aluminum Steel, and the best of each set was plotted in Figure 35 in form of a stress-strain curve. The average for each condition was calculated and plotted in Table 11. Figure 35 shows the tensile test results of three conditions of Austempered High Aluminum Steels: AUST1, AUST2 and AUST3. ...

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... average for each condition was calculated and plotted in Table 11. Figure 35 shows the tensile test results of three conditions of Austempered High Aluminum Steels: AUST1, AUST2 and AUST3. AUST1 has a lower ductility of 13%, but a relatively high yield and tensile strength. ...

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... general, Austempered steels have a good combination of strength and ductility. In Figure 35 the mechanical properties of Austempered steels are higher than the base material. They also show a higher elongation when compared to Quenched and Tempered steels. ...

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... temperatures and times for the quench were considered equal, with the only thing being different is the medium used to cool it down. After tensile test experiments, the results of stress-strain curves are plotted in Figure 36. The figure shows elongations, and strengths of as-received, air cooled, furnace cooled and double normalized Strenx 700MC. ...

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... the overhead cost for these heat treatments are relatively low, and would not have such a big impact. It should be mentioned that the studied steel (in the heat treated conditions) underwent the yield point phenomenon (Figure 36). As was described above, this is a usual phenomenon taken place in low carbon and low alloy steels which is due to the formation of the Luders bands. ...

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... the same reason, the regarded sample possesses a proper elongation (Table 12). Figure 37 shows the results of tensile tests for the water-quenched samples. The graphs presented in this figure cannot be considered as standard/normal tensile curves. ...

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... include three main conditions for the Intercritical Heat Treatment method. Figure 38 shows stress-strain curves of the best of the three intercritical heat treated Strenx 700MC samples; IHT1, IHT2 and IHT3. The data is collected in Table 13. ...