Journal article
Influence of welding process on Type IV cracking behavior of P91 steel
Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India1
Laser Materials Processing Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India2
National Metallurgical Laboratory, Jamshedpur 831007, India3
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India4
Influence of laser welding (LW) and shielded metal arc welding (SMAW) processes on Type IV cracking behavior of modified 9Cr–1Mo (P91) steel has been investigated in this paper. The study involved comparison of stress rupture lives of modified 9Cr–1Mo steel weldments prepared by SMAW and continuous wave CO2 laser welding processes.
Width of the heat affected zone (HAZ) in laser weldment was found to be 1.0mm, whereas it was ~2.5mm in SMAW weldment. The rupture lives of laser weldment were found to be higher than SMAW weldment at higher stress level and comparable at lower stress level. Under similar stress levels, the creep rupture lives of 875°C heat treated specimens were found to be lower than that of the base metal and cross weld specimen.
These results clearly suggest that the instability of microstructure in the intercritical heat affected zone (ICHAZ) is responsible for lower creep rupture lives of P91 steel weldment than the base metal. The experimentally observed variations in creep cavitation have been corroborated with the results of finite element (FE) analysis.
| Language: | English |
|---|---|
| Year: | 2014 |
| Pages: | 148-158 |
| ISSN: | 18734936 and 09215093 |
| Types: | Journal article |
| DOI: | 10.1016/j.msea.2014.06.089 |
