التفاصيل البيبلوغرافية
| العنوان: |
Microstructure and mechanical properties of dissimilar welding T22/T91 using different filler metals. |
| المؤلفون: |
Kamil, Sara Mohammed1 (AUTHOR) mae.20.59@grad.uotechnology.edu.iq, Dawood, Jamal Jalal1 (AUTHOR) 130015@uotechnology.edu.iq, Al-Gebory, Layth1 (AUTHOR) layth.w.ismael@uotechnology.edu.iq |
| المصدر: |
AIP Conference Proceedings. 2024, Vol. 3002 Issue 1, p1-15. 15p. |
| مصطلحات موضوعية: |
*DISSIMILAR welding, *FILLER materials, *STEEL alloys, *MICROSTRUCTURE, *FILLER metal, *ULTIMATE strength, *STEEL pipe |
| مستخلص: |
Welding boiler steam pipes is a challenging process due to the difficult working conditions in which high pressure and temperature values exist frequently. Thus, it is crucial to ensure an effective dissimilar welding process that enables perfect microstructure and good welding mechanical properties. This research is executed to examine the quality and effectiveness of steam boiler pipes used in large-scale thermal power plants. The work depends on investigating the mechanical features of dissimilar welding processes of T22/T91 steel alloy specimen. GTAW process is employed. Several welding verification tests were conducted. Relying on the experimental work and tests executed, the major work results revealed that the ultimate strength of the T22/T91 specimen when the filler material ERNiCr-3 is used reached 421 MPa for maximum elongation of 24%, and the hardness was 170 to 300 HV. While the specimen's ultimate strength amounted to 416 MPa for an elongation of 19% and the hardness ranged (193 to 322 HV) for the filler material ER90S-B3. In addition, it was found that the ultimate strength was 407 MPa for an elongation of 22% and the hardness ranged between 175 to 270 HV for the filler material ER90S-B9. Additionally, the T22/T91 specimen fracture took place at the base metal of T22 for both filler materials ERNiCr-3 and ER90S-B-3. At the same time, it occurred at the welded joint when the filler material ER90S-B9 was exploited. Findings also affirmed that carbon element migrated from T22 to T91 steel alloy, causing higher carbides concentration at the T91. This carbon migration could result in significant welding degradation and affect its reliability when the steel pipes are used frequently at higher temperature and pressure values. Moreover, the presence of delta ferrite that had a negative influence on tensile rupture strength and therefore are undesirable in these types of steels. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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