Acta Metallurgica Sinica (English Letters) ›› 2014, Vol. 27 ›› Issue (1): 55-62.DOI: 10.1007/s40195-013-0020-4
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Alejandro Leiro(), Arash Roshan, Karl-Gustaf Sundin, Esa Vuorinen, Braham Prakash
Received:
2013-04-22
Revised:
2013-09-10
Online:
2014-02-25
Published:
2014-03-11
Alejandro Leiro, Arash Roshan, Karl-Gustaf Sundin, Esa Vuorinen, Braham Prakash. Fatigue of 0.55C-1.72Si Steel with Tempered Martensitic and Carbide-Free Bainitic Microstructures[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(1): 55-62.
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Fig. 3 Microstructures of experimental steel after different heat treated: a austempered at 300 °C; b austempered at 350 °C; c quenched tempered at 460 °C
Sample | d (μm) | Χγ | Hardness (HV0.5) | Rp0.2 (MPa) | Rm (MPa) | A (%) | Rfat(50%) (MPa) | Rfat(50%)/Rm |
---|---|---|---|---|---|---|---|---|
QT | 0.73 ± 0.71 | – | 462 | 1,530 | 1,640 | 8 | 770 | 0.47 |
A1 | 0.29 ± 0.13 | 19 | 532 | 1,370 | 1,550 | – | 980 | 0.63 |
A2 | 0.46 ± 0.14 | 31 | 415 | 1,150 | 1,290 | 15 | 750 | 0.58 |
Table 1 Summary of microstructural parameters and mechanical properties
Sample | d (μm) | Χγ | Hardness (HV0.5) | Rp0.2 (MPa) | Rm (MPa) | A (%) | Rfat(50%) (MPa) | Rfat(50%)/Rm |
---|---|---|---|---|---|---|---|---|
QT | 0.73 ± 0.71 | – | 462 | 1,530 | 1,640 | 8 | 770 | 0.47 |
A1 | 0.29 ± 0.13 | 19 | 532 | 1,370 | 1,550 | – | 980 | 0.63 |
A2 | 0.46 ± 0.14 | 31 | 415 | 1,150 | 1,290 | 15 | 750 | 0.58 |
Fig. 6 Fractograph of a fractured fatigue specimen austempered at 300 °C (A1) and the corresponding single point EDX analysis results of the observed inclusion, applied stress is 975 MPa
Fig. 11 Comparison between endurance limit (Rfat), crack surface hardness (HV Fat) and bulk hardness (HV Bulk) for the samples with different heat treatments
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