Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (10): 1346-1358.DOI: 10.1007/s40195-020-01055-7
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Yong-Han Li1, Zhong-Hua Jiang1(), Zhen-Dan Yang1, Jue-Shun Zhu1
Received:
2019-12-12
Revised:
2020-02-09
Online:
2020-10-10
Published:
2020-10-20
Contact:
Zhong-Hua Jiang
Yong-Han Li, Zhong-Hua Jiang, Zhen-Dan Yang, Jue-Shun Zhu. Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V Steel[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(10): 1346-1358.
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C | Si | Mn | Cr | Mo | V | Fe |
---|---|---|---|---|---|---|
0.15 | 0.08 | 0.57 | 2.24 | 0.88 | 0.24 | Bal. |
Table 1 Chemical composition of low-alloy Cr-Mo-V steel (wt%)
C | Si | Mn | Cr | Mo | V | Fe |
---|---|---|---|---|---|---|
0.15 | 0.08 | 0.57 | 2.24 | 0.88 | 0.24 | Bal. |
Fig. 3 As-quenched microstructures of low-alloy Cr-Mo-V steel at different quenching rates: a SEM micrograph of 1.5 °C/s; b TEM bright-field image of 1.5 °C/s; c SAED pattern corresponding to the bright image in b; d SEM micrograph of 3 °C/s; e TEM bright-field image and inserted SAED pattern of 3 °C/s; f TEM dark-field image corresponding to the bright image in e; g SEM micrograph of 12 °C/s; h TEM bright-field image and inserted dark-field image of 12 °C/s; i TEM bright-field image of 12 °C/s
Fig. 5 XRD patterns of the carbides extracted from different tempering specimens with quenching rate of 1.5 °C/s: a modified tempering; b conventional tempering
Fig. 7 Different tempered microstructures of low-alloy Cr-Mo-V steel at the quenching rate of 12 °C/s: a SEM micrograph of the conventional tempering; b SEM micrograph of the modified tempering; c TEM bright-field image of conventional tempering; d SAED pattern corresponding to the bright image in c
Fig. 8 a Dilatation during tempering at 455 °C corresponding to the specimens quenched with V = 1.5, 3 and 12 °C/s; b dilatation during 2 h tempering stage at 455 °C corresponding to the specimens quenched with V = 1.5, 3 and 12 °C/s
Fig. 10 Charpy impact toughness and Vickers hardness values in dependent of the quenching rates corresponding to the conventional and modified tempering
Fig. 11 SEM micrographs of the fracture surface of Charpy impact samples of the conventional tempering a-c and modified tempering d-f: a, d, b, e, c, f with quenching rates of V = 1.5, 3 and 12 °C/s, respectively
Fig. 12 SEM micrographs of the cross-section area beneath the fracture surface of Charpy impact samples of the conventional a, b and modified c, d tempering: a, c and b, d with quenching rates of 1.5 °C/s and 12 °C/s, respectively
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