Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints
Abstract
:1. Introduction
2. Materials and Methods
3. Filler Metal for Welding
4. Results and Discussion
4.1. Microstructure of T155 in Initial Condition
4.2. Microstructure of T155 Heat-Affected Zone of Welded Joints
4.3. Mechanical Properties of Test Joints
5. Conclusions
- Microstructure of HAZs in the analysed joints is typical of this group of steels. It was shown that the HAZ of joint No. 1 had a homogeneous tempered martensite microstructure without presence of the δ-ferrite, whereas the δ-ferrite patch was observed in the vicinity of the fusion line of CGHAZ in joint No. 2.
- The presence of the δ-ferrite in CGHAZ of joint No. 2 had a slight influence on the tensile strength and hardness of the analysed joints and a significant effect on the impact energy of the HAZ.
- In both of the analysed joints, the presence of the FGHAZ/ICHAZ with significant microstructure degradation was revealed, which was reflected in the minimum microhardness compared to the other areas of the joint.
- Mechanical testing of the sample Thor 115 steel joints welded with both filler materials (CrMo91 and EPRI P87) confirmed good strength properties and good resistance to dynamic loads.
- The results obtained from investigations confirmed a high quality of the joints, good weldability of T115 steel and demonstrated that the filler metals used met the strength and quality requirements.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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C | Mn | Si | Cr | Mo | Ni | Cu | V | Nb | N |
---|---|---|---|---|---|---|---|---|---|
0.09 | 0.47 | 0.15 | 11.30 | 0.52 | 0.16 | 0.08 | 0.24 | 0.04 | 0.002 |
Mechanical Properties of T115 Steel | ||||
---|---|---|---|---|
YS (MPa) | TS (MPa) | El. (%) | KV (J) | HV30 |
610 | 687 | 27 | 158 | 220 |
Filler Material | C | Si | Mn | Cr | Mo | Nb | V | Ni | Fe |
---|---|---|---|---|---|---|---|---|---|
CrMo91 | 0.09 | 0.26 | 0.45 | 9.20 | 0.91 | 0.052 | 0.21 | 0.41 | bal. |
EPRI P87 | 0.11 | 0.16 | 1.55 | 8.52 | 2.02 | 1.09 | - | bal. | 38.8 |
Mechanical Properties of T115 Steel | ||||
---|---|---|---|---|
Filler material | YS MPa | TS MPa | KV J | HV30 |
CrMo91 | 690 | 780 | 150 | - |
EPRI P87 | 360 | 560 | 32 | 150 |
Location of Measurement | Joint No. | ||
---|---|---|---|
1 (WCrMo91) | 2 (EPRI P87) | ||
HV0.1 | |||
WM | face | 234–244 | 124–143 |
root | 237–247 | 173–180 | |
CGHAZ | 273–285 | 232–245 | |
FGHAZ/ICHAZ | 191–207 | 185–206 | |
BM | 212–216 | ||
δ-ferrite | 145–168 * |
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Golański, G.; Słania, J.; Sroka, M.; Wieczorek, P.; Urzynicok, M.; Krawczyk, R. Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints. Materials 2021, 14, 3430. https://doi.org/10.3390/ma14123430
Golański G, Słania J, Sroka M, Wieczorek P, Urzynicok M, Krawczyk R. Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints. Materials. 2021; 14(12):3430. https://doi.org/10.3390/ma14123430
Chicago/Turabian StyleGolański, Grzegorz, Jacek Słania, Marek Sroka, Paweł Wieczorek, Michał Urzynicok, and Ryszard Krawczyk. 2021. "Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints" Materials 14, no. 12: 3430. https://doi.org/10.3390/ma14123430