Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (3): 343-351.DOI: 10.1007/s40195-018-0832-3
Special Issue: 2019年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Xian-Hong Han1, Cheng-Long Wang1, Si-Si Chen1,2, Jun Chen1()
Received:
2018-07-05
Revised:
2018-08-15
Online:
2019-03-10
Published:
2019-02-22
Xian-Hong Han, Cheng-Long Wang, Si-Si Chen, Jun Chen. Fractional Cooling Strategy of the Hot-Stamping Process and Its Influence on Formability and Mechanical Properties of Ultra-High-Strength Steel Parts[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 343-351.
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C | Si | Mn | Al | B | S | P | Cr |
---|---|---|---|---|---|---|---|
0.23 | 0.24 | 1.3 | 0.046 | 0.0026 | 0.002 | 0.022 | 0.174 |
Table 1 Chemical compositions (wt%) of B1500HS
C | Si | Mn | Al | B | S | P | Cr |
---|---|---|---|---|---|---|---|
0.23 | 0.24 | 1.3 | 0.046 | 0.0026 | 0.002 | 0.022 | 0.174 |
Forming temperature (°C) | Yield strength (MPa) | Tensile strength (MPa) | Yield ratio | Elongation | Hardening exponent, n |
---|---|---|---|---|---|
600 | 159 | 324 | 0.491 | 0.269 | 0.25 |
650 | 143 | 294 | 0.486 | 0.344 | 0.21 |
700 | 131 | 259 | 0.506 | 0.309 | 0.21 |
750 | 122 | 230 | 0.530 | 0.305 | 0.19 |
800 | 106 | 191 | 0.555 | 0.292 | 0.18 |
850 | 94 | 163 | 0.577 | 0.271 | 0.15 |
Table 2 Results of the stamping performance indicators against the forming temperature
Forming temperature (°C) | Yield strength (MPa) | Tensile strength (MPa) | Yield ratio | Elongation | Hardening exponent, n |
---|---|---|---|---|---|
600 | 159 | 324 | 0.491 | 0.269 | 0.25 |
650 | 143 | 294 | 0.486 | 0.344 | 0.21 |
700 | 131 | 259 | 0.506 | 0.309 | 0.21 |
750 | 122 | 230 | 0.530 | 0.305 | 0.19 |
800 | 106 | 191 | 0.555 | 0.292 | 0.18 |
850 | 94 | 163 | 0.577 | 0.271 | 0.15 |
Forming temperature (°C) | σs (MPa) | σb (MPa) | δ (%) | σbδ (GPa%) |
---|---|---|---|---|
920 | 882 | 1558 | 10.5 | 16.3 |
800 | 1090 | 1547 | 10.7 | 16.6 |
750 | 1093 | 1538 | 10.8 | 16.6 |
700 | 1045 | 1547 | 11.9 | 18.4 |
650 | 1087 | 1530 | 12.8 | 19.6 |
600 | 1067 | 1563 | 12.7 | 19.8 |
550 | 1067 | 1549 | 12.8 | 19.8 |
Table 3 Mechanical properties of B1500HS post different heat treatments
Forming temperature (°C) | σs (MPa) | σb (MPa) | δ (%) | σbδ (GPa%) |
---|---|---|---|---|
920 | 882 | 1558 | 10.5 | 16.3 |
800 | 1090 | 1547 | 10.7 | 16.6 |
750 | 1093 | 1538 | 10.8 | 16.6 |
700 | 1045 | 1547 | 11.9 | 18.4 |
650 | 1087 | 1530 | 12.8 | 19.6 |
600 | 1067 | 1563 | 12.7 | 19.8 |
550 | 1067 | 1549 | 12.8 | 19.8 |
Fig. 9 Hot-stamping parts by integrating the fractional cooling process: with air cooling aQT = 550 °C, bQT = 600 °C, cQT = 650 °C, dQT = 700 °C, eQT = 750 °C, and with spray cooling fQT = 550 °C, gQT = 600 °C, hQT = 650 °C, iQT = 700 °C, jQT = 750 °C
Fig. 11 Springback results of different forming temperatures and cross sections. a Section 1, b Section 2, c Section 3, d Section 4, e Section 5, f Section 6, g Section 7, h Springback distribution (QT = 650 °C)
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