The Effects of Recrystallization on Strength and Impact Toughness of Cold-Worked High-Mn Austenitic Steels
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure Analysis of Cold-Worked High-Mn Steels
3.2. Tensile and Hardness Properties of Cold-Worked High-Mn Steels
3.3. Impact Toughness of Cold-Worked High-Mn Steels
4. Conclusions
- Microstructures of as-received exhibited elongated austenite grains and the cold-worked high-Mn austenitic steels reveal deformation twinning in the grains. The microstructure of annealed specimens below 800 °C exhibits heterogeneous microstructure which have partially recrystallization region with a high volume fraction of LAGBs, whereas the microstructure of annealed specimens over 800 °C shows homogeneous microstructure which have fully austenite structure with HAGBs.
- The average grain size of the as-received specimen was measured to be about 47 μm and the average grain size after the annealing at 1000 °C was significantly reduced to less than about 23 μm. The grain refinement after the annealing is caused by the recrystallization and grain subdivision by annealing twin.
- The tensile strength and yield strength of cold-worked steels increased with an increase of the cold-working level from 5% to 30% due to the deformation twinning and high volume fraction of LAGBs. At an annealing temperature above 800 °C, the austenite grain was completely recrystallized, and the elongation was improved by grain refinement induced by annealing twin and homogeneous microstructure with HAGBs.
- The absorbed energy of cold-worked steels decreased with the cold-working level from 5% to 30%. After annealing, the absorbed energy increased with increasing annealing temperature. Especially at 1000 °C, the absorbed energy increased about two times comparing the as-received steels regardless of the cold-working level. It was found that the increase in impact toughness after annealing is due to homogeneous microstructure with HAGBs and grain refinement by complete recrystallization. In addition, the results of fracture surface analysis were in good agreement with the results of the absorbed energy from the Charpy impact test at cryogenic temperature.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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C | Mn | Si | Cr | P | S | Cu | Fe |
---|---|---|---|---|---|---|---|
0.44 | 24 | 0.27 | 3.4 | 0.013 | 0.0023 | 0.429 | Bal. |
Specimen ID | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Average Vickers Hardness (Hv) |
---|---|---|---|---|
As-received | 486 | 920 | 83 | 259 |
CW5 | 791 | 1091 | 49 | 336 |
CW5_H600 | 690 | 1093 | 57 | 345 |
CW5_H700 | 603 | 1063 | 61 | 337 |
CW5_H800 | 524 | 1030 | 67 | 274 |
CW5_H900 | 322 | 931 | 96 | 260 |
CW5_H1000 | 318 | 881 | 107 | 260 |
CW10 | 1042 | 1187 | 31 | 383 |
CW10_H600 | 834 | 1164 | 43 | 372 |
CW10_H700 | 721 | 1133 | 51 | 346 |
CW10_H800 | 571 | 1052 | 58 | 312 |
CW10_H900 | 346 | 956 | 90 | 237 |
CW10_H1000 | 338 | 856 | 107 | 228 |
CW30 | 1365 | 1384 | 15 | 484 |
CW30_H600 | 1149 | 1355 | 31 | 449 |
CW30_H700 | 846 | 1179 | 40 | 413 |
CW30_H800 | 498 | 1051 | 60 | 293 |
CW30_H900 | 362 | 955 | 88 | 212 |
CW30_H1000 | 311 | 870 | 110 | 201 |
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Park, M.; Kang, M.S.; Park, G.-W.; Choi, E.Y.; Kim, H.-C.; Moon, H.-S.; Jeon, J.B.; Kim, H.; Kwon, S.-H.; Kim, B.J. The Effects of Recrystallization on Strength and Impact Toughness of Cold-Worked High-Mn Austenitic Steels. Metals 2019, 9, 948. https://doi.org/10.3390/met9090948
Park M, Kang MS, Park G-W, Choi EY, Kim H-C, Moon H-S, Jeon JB, Kim H, Kwon S-H, Kim BJ. The Effects of Recrystallization on Strength and Impact Toughness of Cold-Worked High-Mn Austenitic Steels. Metals. 2019; 9(9):948. https://doi.org/10.3390/met9090948
Chicago/Turabian StylePark, Minha, Moon Seok Kang, Geon-Woo Park, Eun Young Choi, Hyoung-Chan Kim, Hyoung-Seok Moon, Jong Bae Jeon, Hyunmyung Kim, Se-Hun Kwon, and Byung Jun Kim. 2019. "The Effects of Recrystallization on Strength and Impact Toughness of Cold-Worked High-Mn Austenitic Steels" Metals 9, no. 9: 948. https://doi.org/10.3390/met9090948