Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (5): 614-618.DOI: 10.1007/s40195-015-0239-3
• Orginal Article • Previous Articles Next Articles
Received:
2014-10-18
Revised:
2014-12-07
Online:
2015-03-05
Published:
2015-07-23
Bo Han, Lei Chen, Su-Jun Wu. Effect of Austempering-Partitioning on the Bainitic Transformation and Mechanical Properties of a High-Carbon Steel[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(5): 614-618.
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Fig. 1 a Calculated TTT diagram for initiation of bainitic transformation determining; b measured differential thermal analysis (DTA) diagram for phase transformation temperature determining
Fig. 2 Optical images of high-carbon alloy steel after austempered at different temperatures for different time: a 300 °C, 4 h; b 300 °C, 10 h; c 280 °C, 10 h; d 280 °C, 20 h; e 250 °C, 20 h; f 250 °C, 38 h
Fig. 4 TEM images of the high-carbon steel austempered at 300 °C for 10 h a, 280 °C for 20 h b, 250 °C for 38 h c, and the corresponding SAED pattern d of bainitic ferrite plates and retained austenite
Treatment | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Hardness (HRC) |
---|---|---|---|---|
300 °C for 10 h | 1142.9 | 1467.7 | 4.6 | 47.2 |
280 °C for 20 h | 1470.5 | 1623.7 | 5.1 | 49.5 |
250 °C for 38 h | 1677.0 | 2003.1 | 3.2 | 53.9 |
Table 1 Mechanical properties of high-carbon alloy steel under various austempered treatments
Treatment | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Hardness (HRC) |
---|---|---|---|---|
300 °C for 10 h | 1142.9 | 1467.7 | 4.6 | 47.2 |
280 °C for 20 h | 1470.5 | 1623.7 | 5.1 | 49.5 |
250 °C for 38 h | 1677.0 | 2003.1 | 3.2 | 53.9 |
Fig. 5 Optical images of high-carbon steel after austempering-partitioning-tempering treatment: a austempered at 300 °C for 4 h and partitioned at 300 °C for 2 h; b austempered at 300 °C for 6 h and partitioned at 300 °C for 2 h; c austempered at 300 °C for 8 h and partitioned at 300 °C for 2 h
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