Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Preparation and Initial Properties
2.1.1. Casting Process and Chemical Composition of X6CrNiMoVNb11-2 Steel
2.1.2. The Hot-Rolling Process and the Initial As-Rolled Mechanical Properties
2.2. Heat Treatment Schedule and Properties Measurements
2.2.1. Experimental Schedule of the Heat-Treatment Process
2.2.2. Experimental Measurement of Mechanical Properties
3. Results and Discussion
3.1. Analysis of the Alloy Phase Diagram and TTT/CCT Curve
3.1.1. Analysis of the Alloy Phase Diagram
3.1.2. Analysis of the Phase Composition and CCT Curve
3.2. Phase Transformation Temperatures and Martensitic Kinetic Equation
3.2.1. Determination of Martensitic Phase Transition Point
3.2.2. Calculation of the Phase Transformation Kinetic Equation
3.3. Analysis of SEM, XRD, EDS and Phase before and after Heat Treatment
3.3.1. SEM and XRD Analysis before and after Heat Treatment
3.3.2. SEM-EDS Analysis before and after Heat Treatment
3.4. Phase Analysis before and after Heat Treatment
3.4.1. EDS Analysis before and after Heat Treatment
3.4.2. Phase Analysis before and after Heat Treatment
3.4.3. Hardness Analysis after Various Heat Treatment Processes
3.5. Experimental Mechanical Properties under Various Heat Treatments
3.5.1. Effect of the Quenching Cooling Rate on Properties
3.5.2. Effect of Tempering Cooling Rate on Properties
3.5.3. Comparison of Hardness under Various Processes
3.6. Comparison of Mechanical Properties under Various Processes
3.6.1. Determination of the Tempering Hardness Equation
3.6.2. Comparison of Tensile Properties under Various Processes
4. Conclusions
- According to the thermal expansion curve, the Ac1, Ac3, Ms and Mf points are determined to be Ac1 = 774.77 °C, Ac3 = 851.21 °C, Ms = 292.71 °C, Mf = 133.95 °C, and the tempering hardness equation under the quenching-tempering process is obtained;
- Secondary hardening occurs at the tempering temperature of 550 °C, due to the formation of M7C3 in martensite. When the tempering temperature increases up to 650 °C, the M7C3 carbides become coarser and begin to partially convert into M23C6 carbides;
- During the tempering process, the cooling rate has a greater impact on the impact toughness. The faster the cooling rate is, the higher the impact toughness is. With the continuing phase transformation from austenite into martensite that depletes the carbon element, the hardness greatly increases and the elongation slightly decreases;
- The grain size of martensite is finer and more uniform under the process of the oil quenching and tempering with air cooling, compared with that of the oil quenching process. The optimized process, namely, oil quenching at 1040 °C for 1.0 h and then tempering at 650 °C for 1.5 h with the air cooling, yields the best comprehensive properties;
- The ideal heat treatment is to quench at 1040 °C with oil cooling and then temper at 650 °C with air cooling, resulting in hardness on the surface of 313 HV, the hardness at the center is 285 HV, the elongation is 17.9%, and the impact toughness is 65.0 J/cm2;
- The cooling medium has an important effect on mechanical properties. With the decrease in the cooling rate, carbides gradually precipitate during quenching, and the subsequent temper embrittlement appears during tempering, resulting in a great decrease in impact toughness and strength. Thus, high impact toughness can be obtained through rapid cooling during the quenching and tempering processes.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Tensile Properties | Hardness | |||||
---|---|---|---|---|---|---|
σb (MPa) | σ0.2 (MPa) | δ (%) | Ψ (%) | Ak (J/cm2) | HV | |
As-cast | 815 | 695 | 8.3 | 45.0 | 45.0 | 238 |
As-rolled (Initial) | 925 | 735 | 12.1 | 46.0 | 55.0 | 328 |
Quenching Process | Tempering Process | ||||
---|---|---|---|---|---|
Temperature | Time | Cooling | Temperature | Time | Cooling |
Oil cooling | |||||
1040 °C | 1 h | Air cooling | 300–670 °C | 1.5–2 h | Oil cooling |
Furnace cooling | Air cooling | ||||
PAG medium |
Spot Position | Element | Weight % | Atomic % | Net Int. | Spot Position | Element | Weight % | Atomic % | Net Int. |
---|---|---|---|---|---|---|---|---|---|
Spot 1 in Figure 9a | NbL | 91.46 | 86.20 | 1472.15 | Spot 1 in Figure 9b | NbL | 93.01 | 88.56 | 982.32 |
TiK | 0.67 | 1.22 | 10.64 | V K | 1.14 | 1.97 | 10.38 | ||
CrK | 2.01 | 3.38 | 26.53 | CrK | 1.63 | 2.77 | 14.16 | ||
FeK | 5.87 | 9.20 | 62.60 | FeK | 4.22 | 6.69 | 29.70 | ||
Spot 2 in Figure 9a | NbL | 69.09 | 57.02 | 1051.50 | Spot 2 in Figure 9b | NbL | 86.85 | 79.54 | 843.12 |
TiK | 0.17 | 0.28 | 2.93 | V K | 1.02 | 1.71 | 8.87 | ||
CrK | 4.98 | 7.35 | 69.55 | CrK | 2.34 | 3.82 | 19.21 | ||
FeK | 25.75 | 35.35 | 273.78 | FeK | 9.79 | 14.92 | 64.28 |
Regime of Heat Treatment | Hardness (HV) | Phase Composition |
---|---|---|
Quenching at 1040 °C by oil | 380.0–420.0 | α + Nb(C, N) |
Quenching at 1040 °C by oil + tempering at 550 °C | 375.0–395.0 | α + Nb(C, N) + M7C3 + others [48] |
Quenching at 1040 °C by oil + tempering at 650 °C | 300.0–330.0 | α + Nb(C, N) + M23C6 + others [48] |
Outer Layer | Center Position | |||||||
---|---|---|---|---|---|---|---|---|
Oil. + Air. | Air. + Air. | Fur. + Air. | Con. + Air. | Oil. + Air. | Air. + Air. | Fur. + Air. | Con. + Air. | |
Tensile strength (MPa) | 1045 | 1060 | 1050 | 1020 | 1052 | 1060 | 1050 | 1020 |
Yield strength (MPa) | 962 | 948 | 933 | 916 | 975 | 946 | 933 | 910 |
Impact toughness (J/cm2) | 65.0 | 58.8 | 56.8 | 55.0 | 64.0 | 58.8 | 57.9 | 54.5 |
Outer Layer | Center Position | |||||
---|---|---|---|---|---|---|
Oil. + Oil. | Oil. + Air. | Oil. + Fur. | Oil. + Oil. | Oil. + Air. | Oil. + Fur. | |
Tensile strength (MPa) | 944 | 951 | 941 | 941 | 948 | 939 |
Yield strength (MPa) | 835 | 853 | 830 | 830 | 837 | 826 |
Impact Toughness (J/cm2) | 95.0 | 67.0 | 57.5 | 92.0 | 65.0 | 45.0 |
Quenching and Tempering Medium | Surface Hardness | Central Hardness | Difference between Surface and Center |
---|---|---|---|
Air | 308 HV | 279 HV | 29 HV |
Oil | 313 HV | 285 HV | 27 HV |
PAG medium | 335 HV | 297 HV | 38 HV |
Oil (quenching) + air (tempering) | 340 HV | 318 HV | 22 HV |
Condition | σb (MPa) | σ0.2 (MPa) | δ (%) | Ψ (%) | Ak(J/cm2) | Phase | Hardness (HV) |
---|---|---|---|---|---|---|---|
Quenching by oil (Q.Oil) | 952.5 | 853.5 | 12.0 | 44.5 | 65.0 | α + Nb(C, N) | 418 |
Quenching by air (Q.Air) | 965.0 | 838.0 | 11.9 | 44.5 | 65.0 | α + Nb(C, N) | 408 |
Q.Oil + 550 °C tempering | 951.0 | 884.0 | 15.5 | 48.0 | 70.0 | α + Nb(C, N) + M7C3 | 392 |
Q.Air + 550 °C tempering | 993.0 | 850.0 | 14.2 | 46.0 | 64.0 | α + Nb(C, N) + M7C3 | 382 |
Q.Oil + 650 °C tempering | 910.5 | 885.5 | 17.9 | 55.0 | 65.0 | α + Nb(C, N) + M23C6 | 313 |
Q.Air + 650 °C tempering | 925.0 | 820.0 | 16.8 | 53.0 | 60.5 | α + Nb(C, N) + M23C6 | 308 |
Q.Oil + 670 °C tempering | 910.0 | 810.5 | 16.5 | 52.0 | 62.0 | α + Nb(C, N) + M23C6 (coarser) | 315 |
Q.Air + 670 °C tempering | 920.0 | 805.5 | 15.5 | 49.0 | 60.0 | α + Nb(C, N) + M23C6 (coarser) | 298 |
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Fu, J.; Xia, C. Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment. Materials 2021, 14, 5243. https://doi.org/10.3390/ma14185243
Fu J, Xia C. Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment. Materials. 2021; 14(18):5243. https://doi.org/10.3390/ma14185243
Chicago/Turabian StyleFu, Jia, and Chaoqi Xia. 2021. "Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment" Materials 14, no. 18: 5243. https://doi.org/10.3390/ma14185243