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<p>This study was performed to minimize the mechanical anisotropy of dual-phase (DP) steels via a new method. According to the obtained microstructures, the gradual rise in the fraction of martensite was observed as the intercritical annealing time increased from 0.150 to 0.556 in 830–5 and 830–15 samples. The austenite nuclei could effectively restrict the growth of ferrite grains at elevated temperatures, reducing the average ferrite grain size from 7.8 to 6.7&#xa0;µm in the 830–5 and 830–15 samples, respectively. The martensite distribution in both RD-ND and RD-TD planes gradually enhanced as a result of the formation of interconnected martensite islands with increasing soaking time in the dual-phase region. All DP samples revealed a weak texture, and the γ-fiber vanished completely after only 10&#xa0;min of annealing. The Vickers hardness measurements demonstrated an increase from 226.4 ± 9.6 HV to 238.0 ± 6.7 HV and 282.2 ± 7.5 HV with increasing the intercritical annealing time from 5 to 10&#xa0;min and 15&#xa0;min as a result of higher martensite fraction. All DP samples revealed a continuous yielding behavior after the formation of mobile dislocations during quenching to ambient temperature. The higher martensite fraction did not enhance the strength significantly, owing to the reduction in martensite carbon content at higher annealing times. However, both 830–10 and 830–15 samples exhibited a mechanical isotropic behavior because of the weak overall texture and γ-fiber elimination. The strain-hardening curves of the DP samples exhibited a high initial strain-hardening rate and a three-stage behavior resulting from the plastic deformation of ferrite and martensite. Moreover, the increase in the martensite fraction and the reduction in ferrite grain size resulted in the higher initial work-hardening exponent of the 830–15 samples. The fractured surfaces of DP samples revealed a mixture of coarse and fine dimples, indicating a ductile fracture.</p>

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A new method for minimizing anisotropy in dual-phase steel

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • Alireza Shaabani,
  • Roohollah Jamaati,
  • Seyed Jamal Hosseinipour

摘要

This study was performed to minimize the mechanical anisotropy of dual-phase (DP) steels via a new method. According to the obtained microstructures, the gradual rise in the fraction of martensite was observed as the intercritical annealing time increased from 0.150 to 0.556 in 830–5 and 830–15 samples. The austenite nuclei could effectively restrict the growth of ferrite grains at elevated temperatures, reducing the average ferrite grain size from 7.8 to 6.7 µm in the 830–5 and 830–15 samples, respectively. The martensite distribution in both RD-ND and RD-TD planes gradually enhanced as a result of the formation of interconnected martensite islands with increasing soaking time in the dual-phase region. All DP samples revealed a weak texture, and the γ-fiber vanished completely after only 10 min of annealing. The Vickers hardness measurements demonstrated an increase from 226.4 ± 9.6 HV to 238.0 ± 6.7 HV and 282.2 ± 7.5 HV with increasing the intercritical annealing time from 5 to 10 min and 15 min as a result of higher martensite fraction. All DP samples revealed a continuous yielding behavior after the formation of mobile dislocations during quenching to ambient temperature. The higher martensite fraction did not enhance the strength significantly, owing to the reduction in martensite carbon content at higher annealing times. However, both 830–10 and 830–15 samples exhibited a mechanical isotropic behavior because of the weak overall texture and γ-fiber elimination. The strain-hardening curves of the DP samples exhibited a high initial strain-hardening rate and a three-stage behavior resulting from the plastic deformation of ferrite and martensite. Moreover, the increase in the martensite fraction and the reduction in ferrite grain size resulted in the higher initial work-hardening exponent of the 830–15 samples. The fractured surfaces of DP samples revealed a mixture of coarse and fine dimples, indicating a ductile fracture.