Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (3): 386-393.DOI: 10.1007/s40195-015-0217-9
• Orginal Article • Previous Articles Next Articles
Ri-Ming Wu1,2, Wei Li1, Cheng-Lin Wang1, Yi Xiao1, Li Wang3, Xue-Jun Jin1()
Received:
2014-07-30
Revised:
2014-09-08
Online:
2015-01-21
Published:
2015-07-23
Ri-Ming Wu, Wei Li, Cheng-Lin Wang, Yi Xiao, Li Wang, Xue-Jun Jin. Stability of Retained Austenite Through a Combined Intercritical Annealing and Quenching and Partitioning (IAQP) Treatment[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(3): 386-393.
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Fig. 3 SEM micrographs of IAQP steels, C, F, B, M and TM indicate carbide, ferrite, bainite, martensite and tempered martensite, respectively: a 1013QP steel; b 1033QP steel; c 1053QP steel; d 1073QP steel
Fig. 4 EBSD maps of IAQP steels, blue, yellow and red colors indicate ferrite, cementite, and austenite, respectively. Dark areas correspond to a very low band contrast: a 1013QP steel; b 1033QP steel; c 1053QP steel; d 1073QP steel
Fig. 6 Tensile mechanical properties of IAQP steels: a engineering stress versus engineering strain curves; b true stress versus true strain curves; c work-hardening exponent versus true strain
Fig. 7 Exothermic peaks (absolute value) of martensitic transformation a decomposition b of retained austenite upon cooling and heating processes, respectively
Steel | T Ms (K) | T RA (K) | Carbon content (at%) |
---|---|---|---|
1013QP | 223 | 795 | 1.23 |
1033QP | 223 | 790 | 1.42 |
1053QP | 183 | 791 | 1.33 |
1073QP | <123 | 785 | 1.61 |
Table 1 Peak temperature of martensitic transformation (T Ms) and decomposition temperature of retained austenite (T RA) and the average carbon content (ACC) of retained austenite of the IAQP steels
Steel | T Ms (K) | T RA (K) | Carbon content (at%) |
---|---|---|---|
1013QP | 223 | 795 | 1.23 |
1033QP | 223 | 790 | 1.42 |
1053QP | 183 | 791 | 1.33 |
1073QP | <123 | 785 | 1.61 |
Steel | \( {\text{d}}f_{\text{M}} /{\text{d}}\varepsilon \) | σ f (MPa) | \( {\text{d}}\sigma_{\text{M}} /{\text{d}}\varepsilon_{\varepsilon = 0.05} \) (MPa) | σ M (MPa) | σ RA (MPa) |
---|---|---|---|---|---|
1013QP | 1.10 | 386 | 1,500 | 2,400 | 600 |
1033QP | 1.15 | 469 | 1,500 | 2,400 | 600 |
1053QP | 1.00 | 514 | 1,500 | 2,400 | 600 |
1073QP | 0.80 | 606 | 1,500 | 2,400 | 600 |
Table 2 Decreasing rate of austenite during tension (\( {\text{d}}f_{\text{M}} /{\text{d}}\varepsilon \)), flow stress of IAQP steels (σ f), work-hardening rate of martensite at strain of 0.05 (\( {\text{d}}\sigma_{\text{M}} /{\text{d}}\varepsilon_{\varepsilon = 0.05} \)), and the flow stresses of martensite and austenite (σ M and σ RA) for different steels [30]
Steel | \( {\text{d}}f_{\text{M}} /{\text{d}}\varepsilon \) | σ f (MPa) | \( {\text{d}}\sigma_{\text{M}} /{\text{d}}\varepsilon_{\varepsilon = 0.05} \) (MPa) | σ M (MPa) | σ RA (MPa) |
---|---|---|---|---|---|
1013QP | 1.10 | 386 | 1,500 | 2,400 | 600 |
1033QP | 1.15 | 469 | 1,500 | 2,400 | 600 |
1053QP | 1.00 | 514 | 1,500 | 2,400 | 600 |
1073QP | 0.80 | 606 | 1,500 | 2,400 | 600 |
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